Antimicrobial resistance fresco: learn, play and act now

The Antimicrobial resistance fresco is an interactive and educational experience that raises awareness about one of the greatest health challenges of our time. By combining learning, play and collective reflection, it encourages everyone to understand the causes and consequences of antimicrobial resistance and to take action.

Photo WAAW 2025: Antimicrobial resistance fresco: learn, play and act now

It is in the context of the World AMR Awareness Week (WAAW) that Biocodex Microbiota Institute approached Querceo to design a quick and credible tool that could be made available to medical staff and easily deployed at various events and in front of different audiences.

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About the AMR Fresco

The result is an educational, visual, and easy-to-use fresco that highlights the close links between antibiotic use, the balance of our microbiota, and the phenomenon of antibiotic resistance.

  • This workshop is open to the general public and requires no scientific background.
  • It is easy to deploy, designed for around ten participants and lasting approximately 15 minutes.

It can be easily deployed in many contexts: medical conferences, hospital staff meetings, meetings of healthcare professionals—whether general practitioners, pediatricians, pharmacists, or nursing staff. It can also be used in universities with healthcare students.

A facilitation guide

This facilitation guide provides facilitators with an understanding of the workshop dynamics and its place in the facilitation process. It describes the different stages of the workshop, explaining them and outlining the expected outcome in terms of the card matrix. It also offers tips on facilitation and key messages to convey throughout the workshop. Feel free to keep this document handy during your first few workshops.

All the material needed to organize an AMR fresco:

For more information

Contact us at contact@biocodexmicrobiotainstitute.com

Everything you need to know about antibiotics and antimicrobial resistance

Explore this topic

What is the World AMR Awareness Week?

Each year, since 2015, the WHO organizes the World AMR Awareness Week (WAAW), which aims to increase awareness of global antimicrobial resistance. 

Antimicrobial resistance occurs when bacteria, viruses, parasites and fungi change over time and no longer respond to medicines. As a result of drug resistance, antibiotics and other antimicrobial medicines become ineffective and infections become increasingly difficult or impossible to treat, increasing the risk of disease spread, severe illness and death.

Held on 18-24 November, this campaign encourages the general public, healthcare professionals and decision-makers to use antibiotics, antivirals, antifungals and antiparasitics carefully, to prevent the further emergence of antimicrobial resistance.

About the Biocodex Microbiota Institute

The Biocodex Microbiota Institute is an international knowledge hub dedicated to human microbiota. The Institute communicates with its users in seven languages, targeting both healthcare professionals and the general public with the aim of raising awareness about the vital role this organ plays in our health. The Biocodex Microbiota Institute’s primary mission is educational: to spread the word about the importance of microbiota for everyone.

About Querceo

Querceo is a consulting firm that takes a collaborative and systemic approach to supporting organizations through the ecological transition. By creating and disseminating awareness-raising workshops, such as the Biodiversity Mural, the One Health Mural, or the SiNergie workshop, Querceo helps mobilize organizations, enabling each individual to understand and take ownership of the major challenges of tomorrow.

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Antibiotic resistance: discovery of a million antimicrobial peptides

With the rise of antibiotic resistance, the discovery of new antibiotic molecules has become an urgent priority. Nearly a million potential antimicrobial peptides have been identified with machine learning. ¹

Finding new antibiotics to fight resistance is an urgent challenge facing medicine and (sidenote: Machine Learning Automatic learning whereby artificial intelligence solves a task based on metagenomic and metabolomic data collected, in this case the identification of discriminating bacterial species. Wazid M, Das AK, Chamola V, et al. Uniting cyber security and machine learning: Advantages, challenges and future research. ICT Express, 2022; 8(3), 313-321. ) may offer a helping hand. How? By predicting the global reservoir of (sidenote: Antimicrobial peptides (AMPs) Antimicrobial peptides (AMPs) are short sequences of amino acids widely present in a variety of organisms, including bacteria, plants, amphibians, insects, fish, and mammals. They are capable of disrupting microbial growth, most often by interfering with cell wall integrity. Explore https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/antim… ) present on Earth. These AMPs represent a promising therapy which has already been applied clinically in the form of antiviral drugs (e.g. enfuvirtide). They are currently undergoing clinical trials for immunomodulatory properties that can treat microbial infections (yeast, bacteria). Their advantages over antibiotics are considerable: some have a narrow spectrum, thus enabling more targeted therapies, while resistance to many AMPs evolves slowly and is not linked to cross-resistance with other widely used classes of antibiotics.

1.27 million Antibiotic-resistant infections currently kill 1.27 million people per year. ¹

Nearly a million candidates

In practice, researchers have used machine learning-based methods to predict and catalog candidate AMPs (c_AMPs) produced by all terrestrial organisms by sifting through global public databases (63,410 metagenomes and 87,920 bacterial or archaeal genomes). The authors restricted themselves to a particular category of AMPs, those encoded by the organisms’ own genes, amounting to fewer than 100 amino acids. This resulted in the creation of the AMPSphere, a collection of 863,498 non-redundant peptide sequences. 

The majority (91.5%) of these c_AMP sequences had not been previously described. The AMPSphere spans 72 different habitats, which were classified into eight high-level habitat groups (soil/plant: 36.6%; aquatic: 24.8%; human gut: 13%, etc.). Most of these c_AMPs are rare and habitat specific. The majority come from the microbial world, and four of the five bacterial genera that provided the most c_AMPs to the AMPSphere are found in a host (three of which – Prevotella, Faecalibacterium, and CAG-110 – are commonly found in animals).

100 candidates successfully tested

To validate the anti-microbial power of c_AMPs, the researchers synthesized 100 of them and tested them against resistant pathogenic bacteria and commensal bacteria of the digestive system. In vitro, 79 were active against pathogens or commensals, including 63 against 11 pathogens recognized as public health concerns. Four peptides were effective (100% of cells killed after 24 hours incubation at 37°C) at very low concentrations of around 1 µmol/L, comparable to the most potent peptides described in the literature.

Microbiota at the forefront of antibiotic resistance

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What are the mechanisms of action? Studies of peptides active against Acinetobacter baumannii or Pseudomonas aeruginosa show that they significantly permeabilize the pathogens’ outer membrane. The efficacy of the main candidate AMPs has also been confirmed in vivo in murine abscess models (infection by A. baumannii). 

These in vitro and in vivo experiments demonstrate the ability of machine learning to identify functional AMPs from the global microbiome.

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Microbiotalk: short conferences on antimicrobial resistance

Breaking the silence: a global conversation on antimicrobial resistance

Antimicrobial resistance (AMR) is a silent pandemic threatening decades of medical progress. This Microbiotalk conference aims to illuminate the multifaceted challenges of AMR, exploring the intricate connections between gut microbiota, environmental factors, and public health. Featuring international experts and patient advocates, the event delves into topics such as the impact of antibiotics on the intestinal microbiota, the emergence of resistance in early childhood, environmental reservoirs of resistant bacteria, and the critical role of patient and public engagement.

By fostering open dialogue and sharing cutting-edge research, this conference empowers healthcare professionals, policymakers, and individuals to take informed action against one of the most pressing health threats of our time.

The gut microbiota
Photo: Microbiotalk - header AMR

Launched during the WAAW 2024 campaign, this conference series offers a unique opportunity to deepen your understanding of microbiota as well as exploring major public health challenges, such as antimicrobial resistance, digestive diseases, the resistome, the importance of the first 1,000 days of life, women’s health, and more.

Check out the content of the very first Microbiotalk here on Antimicrobial Resistance.

Microbiotalk - AMR banner - Vanessa Carter

Vanessa Carter

Patient and public involvement is key in tackling AMR

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Vanessa Carter's video on the crucial role of patients and the public in the fight against antimicrobial resistance (AMR).

"Antibiotic resistance isn’t discussed enough with patients, and many don’t understand the basics. By teaching people about the proper use of antibiotics we can empower them to be part of the solution"

Vanessa Carter's biography

Chair of the WHO Taskforce of AMR Survivors. She became an AMR patient advocate in 2013 after surviving a serious car accident and 10-year facial reconstruction that caused a highly-resistant MRSA infection which she fought for 3 years.

AMR survivor: her testimony

So this was what I call my...or what was my last photo that was taken at the age of 25. On the right-hand side is my mother, our three generations photo, my grandmother and myself.

Very shortly after that,I ended up in a car accident in Johannesburg, South Africa. A car overtook us on the wrong side of the road. We went into a violent spin, and we hit into a concrete wall.

I was resuscitated at the scene and I was taken to the Charlotte Maxeke Johannesburg Academic Hospital,where I was put on life support,and I had multiple injuries to my abdomen, to my neck, to my back, and also to my pelvis, and a lot of broken bones on the right side of my face, and I also lost the right eye. So once I was discharged, I faced a nine-year journey ahead of me to reconstruct my face because it was a very complicated area and had a lot of damage to it. So this is basically a snapshot of what my journey looked like. So I had to implant a lot of prosthetics.

On my fourth prosthetic, that needed to be implanted about six years down the line, after being discharged from surgery, I went out shopping. I pulled down the rear-view mirror and I saw this discharge just coming out of my face. I got such a fright, I ended up phoning my plastic surgeon and he said: “this sounds like this could be an infection. We need to do an emergency surgery “, which we did. I got discharged.

Two weeks later, the infection was back again. They did a very similar surgery. They had to clean the prosthetic, and they had to do reconstructive surgery. I got discharged. But two weeks later, the infection came back again, looking worse. I was then admitted for a sinus drainage, because I wasn't just under the care of a plastic surgeon, I had a multidisciplinary team. I had to also consult with the ENT surgeon, with the maxillofacial surgeon, with the plastic surgeon, with an ophthalmologist. Each of them was giving differing opinions and prescribing antibiotics in between me seeing them all. And of course, as I said, I had those ongoing surgeries with the infection reappearing two weeks each time. So eventually, I hardly had a face left.

Eleven months from the first time that I saw that infection, and having that infection come back four times, it had eaten a lot of the tissue away, and they had to remove the prosthetic in emergency. And my plastic surgeon sent it for tests. This was the first time that I heard that word 'test'. So I phoned the pathology offices and I said, "Please, can I see a copy of it understand what's going on?" And when they sent it through to me, there were a lot of R's, there were about four or five S's, meaning I was... I'm sure most of you are working in microbiology, you know.

 

It meant I was either resistant or susceptible to the different antibiotics that were on the left-hand side. And I had a highly drug-resistant MRSA, a methicillin-resistant Staphylococcus aureus infection. My doctors had now given up on me, because this was just maybe too much damaged effects. Plus, I also had the problem of the infection, being a high-risk patient, with the infection coming back again.

I took my medical history. I must have contacted about 25 surgeons overseas, because in Johannesburg, in South Africa, we had a shortage of the type of doctor I needed. I connected with a doctor at Brigham and Women's Hospital in Boston, who gave me a 30-minute Skype call and direction of what I needed to do, which was basically to cut the bone, avoid any more foreign objects. We couldn't do plastic surgery. We had to do the maxillofacial surgery first. He said, now take that advice and go find a doctor in Johannesburg that mimics exactly what I said, which I did.

After visiting quite a few, I found a doctor. You can see him on the bottom right-hand side. His name was Professor Reyneke, and he performed the surgery, and it looked amazing. We couldn't believe that we had gotten rid of this deficit. It felt like it was worth all that hassle. Because it was basically a year from the time they took the prosthetic out to the time that we could get it fixed.

But like a bad case of déjà vu, the infection came back. This time not just in the skin, it was also in the bone. So I had osteomyelitis, and I had also developed an allergy to the topical antibacterial that they were using on the skin. At this point, you can imagine my heart sank, I completely lost hope, because I was not beating this resistant infection.

But Professor Reyneke basically started to rotate last-resort antibiotics. So he would have me on one for two weeks, for 10 days, I'd have to go back and he'd check it and he would put me on a different course depending on how I was responding to them.

And three months later, after doing that, it started to clear again. I then, probably about two weeks later, ended up in hospital with an adhesive bowel obstruction. My stomach, I think from all the use of those antibiotics,

I ended up having a section of my intestines removed. I also had adhesions problems, but of course, the antibiotics weren't helping the situation. After getting through that, this is kind of what the result was.

Again, nine years, just under 10 years of having to fight all of that. And of course, three years in total spent fighting resistant infections. When we were complete with that, and I haven't put all my slides in here, but one of the I got very frustrated about was because it was not common knowledge. Why was AMR, why was antibiotic resistance not being discussed with me as a patient?

I've done a lot of work since then. One of the things that I've done more recently is to establish a charity called the AMR Narrative, which focuses on advocacy capacity development and raising awareness, mainly focused on patients and the public. And of course, we work in the four different sectors, as my colleagues were just speaking about now, one health perspective.

This is an example of one of the training programs that we did in Brussels recently, in partnership with the European Patients Forum. We're actually teaching patients the basics of antibiotic resistance because those conversations are still not happening. This particular photo is of 30 young patient advocates with long-term health conditions that want to start advocating for AMR in their own regions. Here are a couple of snapshots, I've just come back from... I do a lot of events, but there's a few here that were taken at the United Nations General Assembly, which I'll talk a little bit about in the panel discussion in a minute, where I did the opening of the multi-stakeholder meeting together with the Deputy General of the United Nations and the President of the General Assembly. Very, very important is that political declaration that they've just worked on. I'll bring that up in a minute.

These are some of our tools and resources from the charity. If you go on to our website, you'll be able to see quite a few of them. We've also created a video for patients and the public to learn a little bit more in lay terms, because it is a very scientific topic. Our main aim is to make it understandable for everybody. And that would be it. This is how you would reach us on social media.

Thank you very much.

3 key messages

  • Struggle with a Resistant Infection: Vanessa Carter shared her personal experience of battling a methicillin-resistant Staphylococcus aureus (MRSA) infection, which required multiple surgeries and antibiotic treatments over a nine-year period after a car accident. 

  • Importance of Awareness on Antibiotic Resistance: She emphasized the lack of communication and awareness about antibiotic resistance (AMR) with patients, which motivated her to establish a charity, the AMR Narrative, to educate and raise awareness among the public and patients on this crucial issue.

  • Multidisciplinary and International Collaboration: Vanessa highlighted the importance of collaboration among various medical specialists and seeking international advice to treat her complex infection, illustrating the need for a global and coordinated approach in managing resistant infections.

Download her presentation

Microbiotalk - AMR banner - Etienne Ruppé

Pr. Etienne Ruppé

The intestinal microbiota and antibiotic resistance

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Professor Étienne Ruppé's video explaining the link between the gut microbiota and antibiotic resistance.

"HCPs must communicate antibiotic resistance clearly to patients, as misunderstandings persist. We should focus on the broader environment rather than blaming microbiota for resistance."

Pr. Etienne Ruppé's biography

His research focuses on antibiotic resistance, on the interactions between microbiota and the emergence of resistant bacteria, the dynamics of antibiotic resistance genes (the resistome) and the diagnosis of infections, with particular emphasis on the application of new sequencing tools.

Pr. Ruppé's speech

The intestinal microbiota and antibiotic resistance

Thank you very much for the invitation and this wonderful conference you're organizing today. The title of my talk is at the core  of what you're proposing today, the intestinal microbiota being at the core of Antibiotic Resistance.

Let's start by a very simplistic representation of the intestinal microbiota and the resistant bacteria it can host. You know, I think, that the intestinal microbiota harbors a huge number of different microorganisms, the dominant one being the bacteria. We have hundreds of species that we estimate, and most of them are commensal, strict anaerobic bacteria that we culture with great difficulty in the lab, and most of them we don't culture at all. Then we got the opportunistic pathogens such as enterobacterales, enterococcus, and they are subdominant in the gut microbiota because of what we call the barrier effect or colonization resistance. This pressure exerted by anaerobic bacteria on this opportunistic pathogen, has a very important property, and we will see that when we take antibiotics, we just disrupt this equilibrium.

When we carry the resistant bacteria we're going to talk about today, then they are even subdominant in their opportunistic pathogens population. We're here today because antibiotic resistance is a major issue, and we have known now for a few years that it kills a lot of people in the world. We estimate the number of deaths being around a million per year. If we do nothing, if we do not react, there could be a total of around 40 million deaths over the next 30 years.

You see here on this graph the top killers. What I want to stress here is that mainly half of them are enterobacterales, acinetobacter baumannii, pseudomonas aeruginosa, half of them. I think most of the problem of antibiotic resistance lies in those bacteria nowadays.

Then you can see also the little circles with the colors. These are the pathogens for which WHO says that there's a critical high or medium need for new antibiotics.

Then we have this little poop emojis here, and they indicate that before causing infections, those bacteria lie in the gut. They will colonize the intestinal microbiota before causing infections. That is why the intestinal microbiota is really at the core of antibiotic resistance.

If we manage to control, understand what's going on in the intestinal microbiota, then we have leverage on fighting the resistant bacteria. Of course, this is a nice equilibrium, this barrier effect to colonization resistance.

But what if we take antibiotics?

Then we disrupt this equilibrium, we come from a diversified rich microbiota to something less diversified, less rich. Of course, not all antibiotics exert the same effect on the microbiota. It depends on how much they are excreted in the gut, how wide their spectrum is. And according to these variables, then you have a disruption of the microbiota.

If you are already carrying resistant bacteria, they will expand. They also favor implantation and colonization of new resistant bacteria. And this has consequences.

So again, what happens in your gut has external consequences. And we and others have shown that the more resistant bacteria you carry in the gut, then the more at risk you will be for infections caused by this resistant bacteria such as urinary-tract infections, bacterial translocation, especially in neutropenic patients.

You will spread more in the environment, and this is important. If you are in a healthcare structure, then this will promote cross-transmissions to other patients. You will carry it for a longer time, it's even connected to pneumonia. There's a connection between the gut to pneumonia in patients in intensive care, where pneumonia eventually gets colonized in the throat by resistant bacteria from your gut.

Those commensals that we had with anaerobic bacteria, are not devoid of antibiotic resistant genes (ARG). They are just different from the resistant genes carried by the pathogens.

So a few years ago, when I was at IAME, nearby Paris, we characterized this human resistance from the gut. And you will see that it's highly diversified with more than 6,000 resistant genes. We, all in this room, carry in average 1000 resistant genes in our gut. They have a very low identity with the resistant genes that we know from pathogens. They are mostly chromosomal. And with all that, all these arguments, we were starting to think that maybe they were not so bad, because it's really difficult for them to be transferred to pathogens. And I mean, we want our commensal bacteria to be resistant to antibiotics. So maybe antibiotic resistance is not so bad depending on the kind of bacteria they are.

This was my short presentation introducing some topics for today. What I wanted to stress is that the intestinal microbiota is mainly made of anaerobic bacteria where the opportunistic pathogens are subdominant. The majority of the bacteria which causes the biggest problem in terms of antibiotic resistance have an intestinal reservoir before causing infections. When we take antibiotics, we promote the expansion of this bacteria in the gut, and that leads to clinical consequences. We shall not forget our good bacteria, our good commensals. They have lots of resistant genes, and they're not largely transferred to bacterial pathogens.

So with that, thank you very much

3 key messages

  • Role of the Intestinal Microbiota in Antibiotic Resistance: The intestinal microbiota, which includes a vast array of microorganisms, plays a crucial role in harboring both commensal and opportunistic pathogenic bacteria. The balance within this microbiota is essential for preventing the overgrowth of resistant bacteria.

  • Impact of Antibiotics on Microbiota and Resistance: Antibiotic use disrupts the equilibrium of the gut microbiota, reducing its diversity and allowing resistant bacteria to thrive. This disruption can lead to increased risk of infections, environmental spread, and cross-transmission in healthcare settings.

  • Importance of Understanding and Preserving Commensal Bacteria: While commensal bacteria in the gut carry many antibiotic-resistant genes, these genes are not easily transferred to pathogens. Maintaining a healthy population of these commensal bacteria is vital, as they play a protective role and their resistance is generally not harmful.

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Microbiotalk - AMR banner - Søren Johannes Sørensen

Pr. Søren Johannes Sørensen

Antibiotic resistance and infant gut microbiome

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Professor Søren Johannes Sørensen's video on antibiotic resistance and the infant gut microbiota.

"Children treated frequently with antibiotics from an early age carry more antibiotic-resistant genes, especially E. coli, with resistance influenced by antibiotics taken by their mothers, affecting long-term health."

Pr. Søren Johannes Sørensen's biography

Linking the early life resistome and microbiome maturation. His research focuses on social interactions in microbial populations and evaluates the extent of genetic flow within natural communities and their response to environmental perturbations.

Pr. Sørensen's speech

Antibiotic resistance and infant gut microbiome:

Thank you very much for that introduction, and for getting the opportunity to talk to you here today.

I think that we are taking up, actually, our research is following very much in line with what we just heard, because we have been studying a cohort of Danish children.

Actually not so much for the onset of this research for understanding antibiotic resistance, but we were interested in understanding how the microbiome early in life, actually shapes health later on, and specifically in this case, looking at asthma, allergy and those kinds of diseases.

We were already studying the microbiome in early life, and then we were seeing results coming out, that a lot of antibiotic resistance is actually in a reservoir in the gut microbiome of adults.

We were curious to ask, how early is this actually going to be established?

Is it something that we acquire late in life?

Or if we already look at these children?

We were actually following these children from birth. The data we were looking at was from when the children were 1-year-old, which is what I'm going to present.

The question we had was, is there already antibiotic resistance Danish children when they're one year old? And the sad, short answer is yes there is.

There's quite a lot already at that time. What we found, which was surprising to us, is in the bottom of the graph, you see that the distribution of the children and how many antibiotic resistance genes they have. So some children do not have many antibiotic resistant genes, whereas actually another population of the children have a lot. And not only they had many different types of antibiotic resistant genes, they also had them in higher abundance.

The children were divided into two groups. Therefore, we were curious to try to understand what is really determining in the child that early, whether they had a lot of antibiotic resistance or not so many. Since we have been following this cohort very, very carefully with lots of data, we could actually try to look into some of these things.

So the circle around there is kind of all these meta data we have, and one of them may be the cause. What we do find not so surprising is that if the children were subscribed with antibiotics for treatment, quite often in early life, for treating airway diseases for example, then they had a much higher risk of being in the group of children which had a lot of antibiotic resistance. There was a very clear connection there. What we also found was that if mothers during pregnancy, these children are now one year old, if they were taking antibiotics, then the child, one year later, was much more likely to have a lot of antibiotic resistance compared to not so many.

Even the mothers taking antibiotics during pregnancy seem to be very important for this. We were also finding other correlations which are maybe less evident. People living in an urban area have more risk of having antibiotic resistance compared to people living in a rural area.

If you have a pet in your house, you have less risk of having antibiotic resistance, so there are many factors. It's becoming more complicated, but we saw a very clear, not so surprising thing.

If you take antibiotics, then your child has a much higher risk. Actually, we see a lot of antibiotics are prescribed to children. However, if you then look at the right side, you see a diagram showing which antibiotics they are resistant to. The red ones are the antibiotics actually prescribed to either the mother or the child. But we see the two dominating ones, the ones that we find most resistance against, they were never prescribed, to neither the child nor the mother.

This is to show that these things are less simple to understand than we quite often see.
So we were trying to investigate this more. We thought one explanation for this could be that we have co-selection. What we know is often that antibiotic resistance is not sitting alone. It's actually in the genome together with other antibiotic resistance.

We started looking into whether we are seeing co-selection. That is what this graph is showing. It's very difficult for you probably to see here, but what we did find very clearly was that the two very abundant antibiotic resistance genes are co-located with the antibiotic resistance that they are treated with. What we are seeing here is that when we give one antibiotic, and it actually didn't matter which one, it caused a whole package of antibiotic resistant genes to come together.

When we were looking more at the co-selection here to see not only what antibiotic resistant were found together, but also why they were also together with other genes, what we found was that they were quite often with virulent genes. Actually, when you're selecting for antibiotic resistance with antibiotics, not only are the bacteria becoming antibiotic resistant, they are also actually becoming a worse pathogen. They're actually at the same time acquiring genes which are making them a more persistent and virulent pathogen. Finally, what we were seeing was that they were also co-located with mobile genes.

What bacteria can do, which is fantastic when you think about it, is they can exchange genes with each other. If a bacteria meets another bacteria and says, "oh, I like your eye color," then they can change it, and then they have the same color.

Of course, they don't have eyes, but they do have antibiotic resistant genes, so they can exchange a trait from one bacteria to another. And those are quite often, a mobile genetic element. And what we have shown very clearly here is that the antibiotic resistance is sitting in these children together in big packets on mobile genetic elements so that they can exchange it in the gut between one bacteria or another.

So even though maybe it's not a potentially pathogenic bacteria in the gut of the children, maybe if they get pathogenic bacteria, they can acquire them there. But not only that, I mean when we're thinking about the likelihood, and if it's an airway bacteria, maybe it's never getting into the gut. The thing is, though, that a gut bacteria is not always in the gut.

All of us, also children, are actually going to the toilet several times a day. So the gut bacteria are actually leaving the gut. They're flushed down the toilet. And that's actually an important phenomenon we also need to investigate.

3 key messages

  • Early Establishment of Antibiotic Resistance in Children: Research on Danish children shows that antibiotic resistance can be established as early as one year old. Children exposed to antibiotics early in life, or whose mothers took antibiotics during pregnancy, are more likely to carry a high number of antibiotic-resistant genes.

  • Factors Influencing Antibiotic Resistance: Various factors influence the presence of antibiotic resistance in children, including urban living, antibiotic use, and even having pets. The study found that children in urban areas had higher resistance, while living in the countryside or those with pets had lower resistance.

  • Co-selection and Gene Exchange Among Bacteria: Antibiotic resistance genes are often co-located with other resistance and virulence genes on mobile genetic elements. This allows bacteria to exchange these genes, increasing the risk of spreading resistance and making pathogens more virulent.

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Antibiotics: what impact on the microbiota and on our health?

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Microbiotalk - AMR banner - Elitsa Penkova

Elitsa Penkova

Antimicrobial resistance in rivers - a public health risk ?

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Elitsa Penkova's video on the presence of antimicrobial resistance in rivers and its potential impacts on public health.

"Antibiotics we take end up in waste, polluting rivers with resistant bacteria, affecting public health, like wild swimmers."

Elitsa Penkova's biography

Elitsa Penkova is a PhD student at the University of Exeter, focusing on assessing health risks related to exposure to antimicrobial resistance (AMR) in freshwater environments. Her research specifically investigates how swimmers in rivers might be exposed to antibiotic-resistant bacteria and genes, aiming to understand the potential public health implications of AMR transmission through natural freshwater environments.

Elitsa Penkova's speech

Antimicrobial resistance in rivers - a public health risk ?:

Thanks for the introduction and thank you for having me. Now, you might be wondering, what does antimicrobial resistance have to do with rivers? This is a hospital issue, right? But for people like me who study antibiotic resistance, these environments are particularly interesting because they already contain, all the necessary components, for the evolution of resistance, to come together in one place, as some of our speakers already alluded to.

So first, in rivers, we have environmental bacteria, and the majority of these are not considered harmful to public health. Some can be, of course, but the majority are involved in things like nutrient cycling, and they're just a normal part of the environmental ecosystem.

But the reason why they're so interesting is because they carry diverse resistance mechanisms. This is because over a millennium, they have had time to coexist with various types of microorganisms which produce antibiotic molecules. And microbes produce these molecules to communicate with each other or to fight each other off. To be able to coexist alongside these microbes which produce antibiotic molecules, environmental bacteria have had to adapt and evolve various coping strategies or resistance mechanisms.

The real issue here is when these resistance mechanisms become transferable, because unlike humans who can only pass down genes from a parent to our offspring, bacteria can actually share genes between both related and unrelated species.

 While it's really fascinating to see how they can literally share a gene from one cell to the other in the previous talk, this is also really terrifying because it means that once a resistance mechanism has emerged and has become transferable, then this has the potential to very quickly spread within and between bacterial populations.

And this is also how bacteria are able to accumulate multiple resistant genes at the same time, which is how we go from a resistant bacteria to what we call a superbug. And here I've included an example of the ability to share genes between environmental bacteria and clinically important pathogens.

The example here is on beta-lactams. Sorry, beta-lactam resistance. Beta-lactams are a class of antibiotics which are most commonly used globally in the resistance mechanism, which bacteria use to overcome the toxicity of these antibiotics, that is beta-lactam resistance. Beta-lactam resistance are enzymes, which bind to the antibiotic and degrade it, essentially. But the genes that are encoding these enzymes are considered to have originally evolved in environmental bacteria and only later transfer to clinically important pathogens.

And this is just to illustrate that while environmental bacteria not necessarily a threat to public health, they can serve as a reservoir for clinically important pathogens, which, incidentally, are also found in rivers. So with our waste, we're continuously enriching rivers in other natural fresh water environments with both human and animal-associated bacteria, but also with various antimicrobial compounds, including antibiotics, of course.

When we take antibiotics, we don't fully metabolize these, and the majority can be excreted directly into our toilets, and from there, drained into our wastewater treatment systems. There are different ways that we process waste, but none of them are designed specifically to remove antibiotic-resistant genes or antimicrobial compounds. So some of these will eventually end up in rivers.

And in addition to this, of course, we hear more often now that wastewater treatment plans are actually permitted to discard untreated or partially treated sewage directly into rivers during heavy rainfalls. This is to prevent themselves from becoming overwhelmed and preventing wastewater backing into people's homes, which is fair enough. But we don't really know what this means for the growing community of wild swimmers, which is what my research focuses on.

And there's actually very little focus on how exposure to antimicrobial resistance in these environments is affecting public health.

We know from previous work in Norway, from a case-control study, that freshwater swimming was identified as an independent risk factor for acquiring resistant infections, resistant urinary tract infections.

We also know from a study in Norway, which estimated that freshwater swimming accounted for about 6% of the acquisition of resistant cases in the community over the summer months.

We know from a study on UK coastal swimmers, so not freshwater swimmers, but coastal swimmers. Surfers were found to be four times more likely to carrying antibiotic resistant bacteria than people who don't go into the water.

And similar to that study, I'm now working to understand whether fresh water swimmers are at high risk of carrying resistant bacteria in their guts. But as I'm still collecting my samples, I'm not able to talk about my findings yet, but I'm happy to take any questions if you have them.

Thank you

3 key messages

  • Rivers as Reservoirs for Antibiotic Resistance: Rivers contain environmental bacteria that have developed diverse resistance mechanisms over millennia. These bacteria can transfer resistance genes to clinically important pathogens, making rivers significant reservoirs for antibiotic resistance.

  • Impact of Wastewater on River Microbiota: Human and animal waste, along with antimicrobial compounds, are continuously introduced into rivers through wastewater. Wastewater treatment plants are not designed to remove antibiotic-resistant genes, leading to the enrichment of rivers with these genes, especially during heavy rainfalls when untreated sewage is discharged.

  • Public Health Risks for Freshwater Swimmers: Exposure to antibiotic-resistant bacteria in rivers poses a public health risk, particularly for freshwater swimmers. Studies have shown that swimming in freshwater can increase the risk of acquiring resistant infections, highlighting the need for more research on the impact of antimicrobial resistance in natural water environments.

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Microbiotalk - AMR banner - Edith Odeh

Edith Odeh

Ampiclox and contraception, raise awareness on AMR

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Edith Odeh's video on the use of Ampiclox as a contraceptive and the issues surrounding antimicrobial resistance awareness.

"Raising awareness about reproductive health is key in communities where many women are misinformed. Knowledge empowers and improves society."

Edith Odeh' biography

Passionate and committed pharmacist in Nigeria.
Founder of Kings Heritage Pharmaceutical Limited, Asaba, Nigeria.

She has opened a health center bringing together pharmacists, doctors and volunteers to provide reliable information on contraceptive methods and alert women to the long-term consequences of antibiotic abuse, such as microbiota dysbiosis and AMR.

This ambition earned her the first Henri Boulard prize in 2021.

Her project: raise awareness on AMR, Ampiclox use and contraception

I want to start by sharing my early inspiration and motivation. In 2015,early in my career as a community pharmacist, on a fateful day, a father brought in his 13-year-old child who was suffering from severe diarrhea.

So after a thorough review of the patient's medical history, I decided to initiate treatment with probiotic. Within an hour of initiating this treatment, the teen who had arrived carrying a waste bucket was able to leave the pharmacy comfortably wearing just his diaper. This wonderful experience sparked my interest in Biocodex's commitment to evidence-based medicine, inspiring me to develop a grant project which is titled, establishing a reproductive health facility to address safe contraception methods and to dispel the myths surrounding the use of Ampiclox capsule as a female contraceptive in Nigeria.

And you may be wondering, what is the correlation between Saccharomyces and contraception? Having demonstrated such a level of honesty and standard, I was convinced that this institute has a sincere purpose, and if I merit this award, I was going to win.

Now, coming to the scope of my project and the implementation. The project, which focused mainly on reproductive health and safe contraception methods, reached out to seven communities, engaging an average of 20% of the populace in each community. We distributed free contraceptive educational materials and anthelmintics and inspirational books, to provide these communities with accurate reproductive knowledge and rational use of antibiotics. Now, recognizing the cultural sensitivity of the project, we collaborated closely with community heads, religious leaders, and healthcare professionals to pilot our approach.

This led to an impressive turnout of 20% across the communities. Through this project, we succeeded in reducing the number of unwanted pregnancies, improving responsible antibiotic use, and promoting healthcare community practices, leveraging on local partnership. We succeeded in yielding, in getting the result of the project and addressing a specific community need. In a community where you have about 50% of the female population misinformed, and naive about their reproductive health, it was a huge burden.

But as a result of this project, we were able to sensitize them, and they are now better equipped with reproductive knowledge. They have a better control. So these are some of the pictures from the outreach.

King's Heritage Pharma Limited plans to train local representatives in each community who will serve as ongoing educators and champions for reproductive health. We also aim to extend our outreach to more communities and build stronger partnership with healthcare professionals. We also intend to enhance the initiative by collaborating more with local influencers.

Our reproductive health facility, which is strategically located at Agbaroto-Otor, Ughelli, in North Delta State, will serve as a center for support and education. Now, as we continue to expand our outreach and build partnership with healthcare professionals for sustainable impact, we invite all healthcare professionals, community leaders, and educators to join us in advancing reproductive health and rational use of antibiotics.

With your support and collaboration, we can empower more advocates, dispel harmful myths, and provide life-changing resources. Together, we can create a healthier, informed, and a more resilient community.

Thank you.

3 key messages

  • Inspiration and Commitment to Evidence-Based Medicine: Edith's early experience as a community pharmacist, successfully treating a child with severe diarrhea using probiotics, inspired her commitment to evidence-based medicine and led her to develop a grant project focused on reproductive health and safe contraception methods in Nigeria.

  • Community Outreach and Education: The project reached seven communities, engaging 20% of the population in each, and provided educational materials on contraception and antibiotics. By collaborating with community leaders and healthcare professionals, the project successfully reduced unwanted pregnancies and improved responsible antibiotic use.

  • Sustainable Impact and Future Plans: The reproductive health facility in North Delta State built thanks to the grant received will serve as a center for support and education, aiming to build stronger partnerships and empower communities with accurate reproductive health knowledge.

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Microbiotalk - AMR banner - Greatman Adiela

Greatman Adiela Owhor

The 100 AMR stewards project

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Greatman Adiela Owhor's video presenting the "100 Stewards Against AMR" project.

"This project was to empower professionals and caregivers, and implement robust antibiotic stewardship initiatives in healthcare settings."

Greatman Adiela Owhor's biography

Greatman Adiela Owhor is a dedicated pharmacist and health content creator with a strong foundation in research, project management, and health promotion. He is an emerging researcher with growing expertise, having already published in respected journals like *The Lancet* and the *International Journal of Health Planning and Management. * His work has earned over 150 citations and an H-index of 3, reflecting his impact in the field.

Greatman's commitment to public health has been widely recognized. In 2021, he received the prestigious Diana Award from the United Kingdom, an honour awarded to young people making significant contributions to their communities. Additionally, he was named "Pharmacist of the Year" in Rivers State in 2020 and "Public Health Promoter of the Year" in 2021. His work was further celebrated with a feature on World Volunteering Day in Nigeria (2020) for his public health contributions.

In 2023, Greatman founded *CommCase*, a groundbreaking platform connecting community pharmacists globally to address challenging cases encountered in practice. CommCase facilitated the resolution of over 1,000 cases within its first year, earning widespread recognition across Africa. For his work with CommCase, Greatman was named Nigeria’s "Top Pharmacy Innovator of 2023" by Mega We Care Pharmaceuticals.

Greatman's efforts to combat antimicrobial resistance (AMR) reached new heights in 2023 when he was awarded the Henri Boulard Public Health Award. With this award, he launched a nationwide AMR awareness campaign that engaged thousands of individuals both online and offline, achieving a 50% increase in awareness in the targeted areas.

With an active following of over 70,000 on X (formerly Twitter), Greatman continues to advocate for public health and AMR stewardship. Looking to the future, he aims to leverage health promotion and technology to significantly impact community health and well-being.

His project: the 100 AMR stewards project

My name is Greatman Adiela, and I am the team leader for 100 AMR Stewards Project. This project was primarily designed to empower 100 individuals to carry out local antimicrobial resistance projects in their region.

This project was possible because of the support from the Biocodex Foundation.

So we started with a four-month online campaign where we reached out, to over 600,000 Nigerians, and we engaged them about issues related to antimicrobial resistance in their region.

We leveraged platforms such as Facebook, TikTok, Instagram, X, and LinkedIn in carrying out this engagement.

This was quickly followed up by scouting for stewards, 100 of them, training them, helping them understand the Antimicrobial resistance and the issues peculiar to their environment, and also supporting them in executing a local project.

Nigeria is divided into six geopolitical zones, so we're careful to ensure that our 100 stewards are spread out across these zones.

We became emotional after two months because the stewards overdelivered on their project. We are pleased to have done projects in abattoirs, markets, schools, and even on the streets.

We ensured that these projects were measurable. Therefore, the stewards had to make some form of assessment to get numbers or figures about the understanding of AMR in their region or about issues related to AMR.

And then after their campaigns or projects, they were also made to reassess the same metrics that were previously assessed to see if there had been an improvement. And we are pleased because some regions experienced more than a 70% increase in their knowledge of antimicrobial resistance.

We are excited about what we've done over the past months, and we are even more excited about doing more in the future.

On behalf of all the stewards and my team, I want to say thank you, to Biocodex Microbiota Foundation, for partially supporting this project and bringing all our dreams to life.

Thank you.

3 key messages

  • Empowerment and Training of AMR Stewards: The 100 AMR Stewards Project aimed to empower 100 individuals across Nigeria's six geopolitical zones to carry out local antimicrobial resistance (AMR) projects. These stewards were trained to understand AMR issues specific to their regions and supported in executing measurable local projects.

  • Extensive Online Engagement: The project began with a four-month online campaign that reached over 600,000 Nigerians through platforms like Facebook, TikTok, Instagram, X, and LinkedIn. This campaign raised awareness about AMR and engaged the public on related issues.

  • Significant Impact and Future Plans: The stewards' projects led to a more than 70% increase in AMR knowledge in some regions. The success of these initiatives has motivated the team to continue expanding their efforts, with plans to train more local representatives and build stronger partnerships for sustainable impact.

BMI-24.60

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Xpeer course: Microbiota in intimate woman health through the lifespan

Gynecologists, midwives, and pharmacists, get free training on "Microbiota in intimate woman health through the lifespan" from Professor Alessandra Graziottin in this CME course.

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Synopsis of the course

This accredited course aims to educate gynecologists, midwives, and pharmacists on the significance of microbiota, particularly vaginal microbiota, for intimate health. Led by a renowned expert, Dr. Graziottin, thoroughout the course participants will gain a comprehensive understanding of how microbiota impacts intimate health across the lifespan. We will first cover the basic insights about the gut microbiome before delving into the vaginal microbiota throughout different life stages, including the potential for a sterile placenta, neonatal microbiota, and changes during infancy, puberty, fertile years, and menopause. Do not miss the practical recommendations, common misconceptions and summarizing key takeaways that will provide you with the necessary knowledge and skills in your clinical practice.

Join now!

This activity is supported by unrestricted financial support from Biocodex.

Who is Alessandra Graziottin?

Alessandra Graziottin, MD is an Italian gynecologist, oncologist, sexologist, and psychotherapist. She is the director of the Center for Gynecology and Medical Sexology at the San Raffaele Resnati Hospital in Milan.

  • In 2008 she founded the Alessandra Graziottin Foundation for the treatment of pain in women Onlus, of which she is president.
  • She is currently Consultant Professor at the Advanced Master in Andrology and Sexual Medicine of the University of Firenze.
  • She also was Consultant Professor at the Advanced master's in clinical Sexology of the University of Pisa, and Professor at the Master Course of Sexual Medicine for Students of Psychology of the University of Venezia and Salesian University (UPS) of Roma.

She is a renowned gynecologist, having published 22 scientific books and 7 popular books (as the author, co-author, or editor), over 90 chapters of scientific books, 8 educational manuals for women, and more than 400 scientific articles on various aspects of gynecology and medical sexology.

Conflicts of Interest Statement: The author declares receiving honoraria from stellas, Fagron, Mammowave, Mylan, Named, Techdow, Uriach; participating as speaker in bureaus sponsored by Astellas, Biofemme, Bromatech, Lolipharma, Named, Techdow, Uriach; and being part of advisory boards of Astellas, Mylan, Techdow, Uriach.

What is Xpeer?

Xpeer Medical Education is the first accredited medical education app in the market, with video microlearning engaging videos of just 5 minutes.

With a powerful algorithm to personalize the user experience and the contents as the most popular entertaining streaming platforms, it offers a brand new experience for the continuing education and professional development of the healthcare professionals.

Accredited by the European Union of Medical Specialists, it delivers high quality scientific medical education pieces. On Xpeer, you will find this curriculum on Microbiota and 500 hours of medical education in 2021 in your specialty, technologies and professional and personal skills.

Information on accreditation

The app Xpeer is accredited by the European Accreditation Council for Continuing Medical Education (EACCME) to provide official ECMEC credits recognized officially in 26 countries.

The credits for the users of the module will be 1 European CME credit (ECMEC®) for every hour (60 minutes of actual e-learning excluding introductions etc.) of use, provided that the users have completed a module and have passed the relevant assessment.

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Article Gynecology

Urinary tract infections: toward alternative dietary and probiotic strategies?

Preventive strategies based on a balanced diet or even the use of probiotics could represent alternatives to curative treatment with antibiotics in the management of urinary tract infections. Although effective in the short term, antibiotics can also lead to dysbiosis, new infections and resistance.

Over 80% of urinary tract infections are caused by (sidenote: Uropathogenic Escherichia coli E. coli that often have additional genes (compared with commensal E. coli) which boost their virulence (flagella, toxins, surface polysaccharides, etc.). ) . These gut bacteria can migrate from the anus, colonize the urethra and then migrate up into the bladder. In fact, previous studies have shown that women suffering from urinary tract infections have an increased abundance of E. coli in their digestive system, with similarities between the gut species and those colonizing the urinary tract. 

To assess dysbiosis and other potential risk factors in women with a history of cystitis, researchers enrolled 753 female volunteers aged 18 to 45 who had been diagnosed with a UTI in the last five years and were otherwise in good health. 1

With the exception of a spike among young women aged 14-24, the prevalence of urinary tract infections increases with age. The prevalence in women over 65 years of age is approximately 20%, compared with approximately 11% in the overall population. 2

Between 50% and 60% of adult women will have at least one urinary tract infection in their lifetime, and close to 10% of postmenopausal women indicate that they had a urinary tract infection in the previous year. 2

Opt for a healthier diet

Nearly ¾ of the women studied (71%) had gut dysbiosis, which proved to be associated not only with the (sidenote: Recurrent urinary tract infection A recurrent urinary tract infection is defined as the occurrence of ⩾2 symptomatic episodes in 6 months or ⩾3 symptomatic episodes in 12 months. ) of their urinary tract infections, but also with the presence of antibiotic multidrug resistance in their flora.

Another particularity of the population studied is their diet, whether it be drinks (less than 1 L of water per day, consumption of sugary drinks), food (over-representation of salty products, high-calorie diets rich in added sugars and saturated fats), or dietary supplements intended to prevent urinary tract infections.

More than 80% of urinary tract infections are caused by uropathogenic Escherichia coli. ¹

150 million Urinary tract infections are among the most frequent bacterial diseases, affecting an astounding 150 million individuals worldwide each year. ¹

For the researchers, these observations support the link between diet and the composition of the gut microbiota. In this regard, they refer to previous studies which have shown that only 12% of structural variation in the gut microbiota can be attributed to genetic changes, while 57% can be explained by dietary changes.

Microbiota as a new therapeutic strategy 

Although the standard treatment for urinary tract infections is antibiotics, in the long term they disrupt the gut microbiota (dysbiosis) and encourage multidrug resistant organisms. Hence the importance, according to the authors, of alternative and complementary therapeutic choices.

The researchers also point out the beneficial effects of probiotics, in particular Lactobacillus spp. which reduces the adherence, growth and colonization of uropathogenic bacteria such as E. coli: Enteric-release L. salivarius travels to and protects the urinary and vaginal microbiota, and a probiotic composed of two strains of Lactobacillus and cranberry extracts significantly reduces the number of recurrent urinary tract infections in young premenopausal women, compared with a placebo product.

Probiotics also have a major advantage over antibiotics: the administration of lactobacilli does not encourage the development of resistance.

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News Gastroenterology

Your gut bacteria could be the key to controlling hunger

Discover how your gut bacteria might be the secret weapon in controlling hunger and managing weight. New research reveals that probiotic, prebiotics and fiber-rich diets can reshape your microbiome, boosting satiety hormones and keeping overeating in check. The future of weight management could be in your gut!

The gut microbiota Obesity Probiotics Prebiotics: what you need to know

The regulation of appetite is a complex, multi-dimensional process that plays a pivotal role in maintaining energy homeostasis. Satiety, distinct from hunger and satiation, is central to this regulation. 

  • Hunger represents the physiological need for food, typically driven by signals from the brain in response to energy depletion.
  • Satiation, on the other hand, marks the sensation of fullness experienced during a meal, signalling an end to eating.
  • In contrast, satiety refers to the prolonged sense of fullness that suppresses further eating between meals, thus influencing the timing of subsequent food intake.

Understanding the mechanisms behind satiety is critical for healthcare professionals and individuals alike striving to combat obesity, diabetes, and other metabolic disorders. Increasingly, research points to the gut microbiota as a key regulator of satiety signalling, linking the microbial environment of the gut to brain function via what is commonly termed the gut-brain axis. Emerging evidence suggests that gut bacteria and their metabolites, particularly short-chain fatty acids ( (sidenote: SCFAs Short Chain Fatty Acids are a source of energy (fuel) for the cells of the individual. They interact with the immune system and are involved in the communication between the intestine and the brain. Sources:
Silva YP, Bernardi A, Frozza RL. The Role of Short-Chain Fatty Acids From Gut Microbiota in Gut-Brain Communication. Front Endocrinol (Lausanne). 2020;11:25.
)
), are integral to satiety regulation, influencing the release of satiety hormones and modulating appetite. 1,2,3

We invite you in this article to explores the growing body of evidence on the gut microbiota’s role in regulating satiety, focusing on microbial metabolites, their interaction with the gut-brain axis, and the implications for clinical practice. We will analyse how dietary interventions aimed at modifying gut microbiota composition, such as the use of probiotic, prebiotics and fiber-rich diets, can influence satiety and offer novel approaches for managing obesity and related metabolic conditions.

What is the difference between prebiotics, probiotics and postbiotics?

Learn more

Gut-brain conversations: how the microbiota shapes satiety signals?

The gut-brain axis is an intricate network that communicates satiety signals between the gut and brain. This interaction is largely influenced by the gut microbiota, which regulates appetite through hormones like glucagon-like peptide-1 (GLP-1), peptide YY (PYY), and cholecystokinin (CCK). These hormones are produced by specialized cells in the gut called enteroendocrine cells (EECs) in response to food intake.

GLP-1, PYY, and CCK play key roles in telling the brain that we're full. For example:

  • GLP-1 slows down how quickly food moves through the digestive tract, giving the body more time to absorb nutrients, and helps control blood sugar levels. 5
  • PYY works to reduce appetite after meals by signalling the brain to stop eating. 6
  • CCK is released when fat and protein are detected in the gut and helps to digest food while also making us feel full. 7

Together, these hormones act on the brain to reduce food intake and prolong the feeling of fullness, helping to maintain a healthy balance in food consumption.

One of the microbiota’s key contributions is the production of SCFAs - acetate, propionate, and butyrate - during fiber fermentation. SCFAs stimulate the release of GLP-1 and PYY, reinforcing fullness and helping control appetite. 1 Additionally, SCFAs interact with the vagus nerve, which directly connects the gut to the brain’s hunger centers, enhancing satiety signals. 2

Satiety, hunger and satiation

  • Satiety refers to the prolonged feeling of fullness that suppresses the urge to eat between meals.
  • Hunger is the physiological drive to eat, triggered by the body's need for energy, often signaled by hormonal and neural cues.
  • Satiation is the sensation of fullness experienced during a meal, which signals the body to stop eating. 

The microbiota’s role extends beyond signaling; SCFAs also reduce inflammation in the hypothalamus, preserving the integrity of satiety regulation and helping prevent obesity-related metabolic disorders. 2 But how do probiotic and specific dietary interventions, such as prebiotics, influence the gut microbiota to enhance satiety?

What role does the microbiota play in the gut-brain axis?

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The role of probiotics in enhancing satiety signals

Recent studies have shown that certain bacteria can produce proteins that send signals to our brain, telling us we’re full. One example is a protein called ClpB, produced by some bacteria like Hafnia alvei. This protein behaves similarly to alpha-MSH, a hormone that helps regulate appetite. This protein stimulates the release of PYY, a hormone that promotes feelings of fullness and reduces appetite. 3

Preclinical studies have shown that Hafnia alvei can help reduce food intake and body weight gain in animal models by amplifying these satiety signals. 3 When used as a probiotic supplement, Hafnia alvei may enhance the feeling of fullness in humans, supporting healthy eating behaviors and contributing to long-term weight management. 4 Although more research is needed, early findings suggest that probiotics could offer a complement to dietary interventions aimed at controlling appetite and reducing excess weight. 3

Fueling satiety: how prebiotics and dietary fibers modulate the microbiota?

Dietary interventions, particularly those involving prebiotics and dietary fibers, offer a direct way to influence the gut microbiota and enhance satiety. Prebiotics are non-digestible food components that selectively stimulate the growth and activity of beneficial gut bacteria. A prime example is inulin, a fiber that increases the production of SCFAs, notably propionate and butyrate, which play a key role in satiety signaling. 2

In human studies, inulin-propionate ester (IPE) supplementation has shown promising results. For instance, subjects who consumed IPE experienced a decrease in ad libitum energy intake, meaning they naturally reduced their food consumption without conscious effort. 2 The SCFAs produced from fiber fermentation, particularly propionate, directly stimulated the release of GLP-1 and PYY, enhancing feelings of fullness. 1

Additionally, resistant starch, another fermentable fiber, has demonstrated its ability to reduce postprandial glucose levels and influence satiety hormones. One study showed that resistant starch supplementation over six weeks reduced leptin levels, a hormone involved in long-term energy balance, signaling improved appetite regulation. 1

These examples highlight how fiber-rich diets can modulate gut microbial activity to positively affect satiety. But what about other microbial metabolites beyond SCFAs? How do they influence the central and peripheral regulation of hunger?

Beyond fiber: the role of neuroactive metabolites in appetite control

In addition to SCFAs, gut bacteria produce several neuroactive metabolites that play crucial roles in regulating appetite and satiety through both central and peripheral pathways. Among these, serotonin, gamma-aminobutyric acid (GABA), and dopamine are key neurotransmitters involved in modulating food intake and energy balance. 2

90% of the body’s serotonin is produced in the gut

Interestingly, approximately 90% of the body’s serotonin is produced in the gut by enterochromaffin cells, influenced by the microbial environment. 3 This serotonin not only regulates gut motility but also interacts with the vagus nerve to signal the brain’s satiety centers, contributing to the suppression of hunger after meals. 2

In the case of GABA, certain strains of Lactobacillus and Bifidobacterium can produce this neurotransmitter. GABA affects the hypothalamus, which is central to hunger regulation, by modulating neural circuits that control feeding behaviour. Studies have shown that germ-free mice exhibit altered GABA signalling, resulting in increased appetite, highlighting the critical role of gut-derived GABA in controlling hunger. 3

Moreover, dopamine, which is involved in food reward mechanisms, is also influenced by the gut microbiota. Imbalances in dopamine pathways can lead to overeating and even binge-eating behaviours, underscoring the microbiota’s potential role in managing not just hunger but food addiction.1

Dysbiosis: when gut imbalance sabotages satiety

Dysbiosis, the imbalance or maladaptation of the gut microbiota, has emerged as a critical factor in the disruption of normal satiety signals. In individuals with obesity and metabolic disorders, dysbiosis is commonly observed, characterized by a reduction in microbial diversity and an overgrowth of certain pathogenic bacteria. 3 This imbalance can impair the production of key microbial metabolites, particularly SCFAs, which are essential for regulating the hormones responsible for satiety, such as GLP-1 and PYY. 1

Moreover, dysbiosis compromises the intestinal barrier, increasing the translocation of bacterial endotoxins like lipopolysaccharide (LPS) into circulation. Elevated LPS levels are associated with chronic low-grade inflammation, which disrupts satiety signaling by inducing neuroinflammation in the hypothalamus, a key brain region involved in hunger regulation. 2 This inflammatory state alters the brain’s ability to properly respond to satiety hormones, contributing to overeating and metabolic dysfunction.

Research shows that individuals with dysbiotic microbiomes often exhibit elevated levels of the appetite-stimulating hormone ghrelin, leading to persistent feelings of hunger and difficulty in maintaining a healthy energy balance. 3 These disruptions highlight the importance of maintaining a healthy, diverse microbiota not only for digestive health but also for proper appetite regulation and long-term metabolic control.

Have you heard of "dysbiosis"?

Learn more

Rewiring satiety: harnessing probiotic, prebiotics and fiber-rich diets for therapeutic gain

The therapeutic potential of probiotics, prebiotics and fiber-rich diets in modulating the gut microbiota offers a powerful tool to enhance satiety and manage metabolic disorders. 8 Research consistently shows that dietary fibers, such as inulin, fructooligosaccharides (FOS), and resistant starch, serve as critical agents in stimulating SCFA production - specifically butyrate, propionate, and acetate - which directly influence satiety regulation through the gut-brain axis. 9

The evidence points to a future where precision nutrition - tailored dietary interventions based on an individual’s microbiome profile - could be a key therapeutic strategy. 10 By targeting the microbiota with specific probiotic, prebiotics and fibers, clinicians can restore gut balance, enhance satiety, and help patients manage both appetite and metabolic health more effectively. As the understanding of the microbiota’s role in satiety deepens, it offers a new horizon of personalized therapies that go beyond traditional approaches to treating obesity and metabolic diseases. 11

Sources

1. Deehan EC, Mocanu V, Madsen KL. Effects of dietary fibre on metabolic health and obesity. Nat Rev Gastroenterol Hepatol. 2024;21(5):301-318.

2. Bastings JJAJ, Venema K, Blaak EE, et al. Influence of the gut microbiota on satiet signaling. Trends Endocrinol Metab. 2023;34(4):243-255.

3. Pizarroso NA, Fuciños P, Gonçalves C, et al. A Review on the Role of Food-Derived Bioactive Molecules and the Microbiota-Gut-Brain Axis in Satiety Regulation. Nutrients. 2021;13(2):632.

4. Déchelotte P, Breton J, Trotin-Picolo C, et al. The Probiotic Strain H. alvei HA4597® Improves Weight Loss in Overweight Subjects under Moderate Hypocaloric Diet: A Proof-of-Concept, Multicenter Randomized, Double-Blind Placebo-Controlled Study. Nutrients. 2021;13(6):1902.

5. Drucker DJ. Mechanisms of Action and Therapeutic Application of Glucagon-like Peptide-1. Cell Metab. 2018;27(4):740-756. 

6. Degen L, Oesch S, Casanova M, et al. Effect of peptide YY3-36 on food intake in humans. Gastroenterology. 2005;129(5):1430-1436.

7. Rehfeld JF. Cholecystokinin-From Local Gut Hormone to Ubiquitous Messenger. Front Endocrinol (Lausanne). 2017;8:47.

8. Mallappa RH, Rokana N, Duary RK, et al. Management of metabolic syndrome through probiotic and prebiotic interventions. Indian J Endocrinol Metab. 2012 Jan;16(1):20-7.

9. Chambers ES, Morrison DJ, Frost G. Control of appetite and energy intake by SCFA: what are the potential underlying mechanisms?. Proc Nutr Soc. 2015;74(3):328-336. 

10. Zmora, N., Suez, J. and Elinav, E. You are what you eat: diet, health and the gut microbiota. Nat Rev Gastroenterol Hepatol 16, 35–56 (2019).

11. Torres-Fuentes C, Schellekens H, Dinan TG, Cryan JF. A natural solution for obesity: bioactives for the prevention and treatment of weight gain. A review. Nutr Neurosci. 2015;18(2):49-65.

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Infant microbiota: it’s up to you, dads!

Women keep telling us so: fathers have an important role to play in their children’s lives. Science 1 has now shown that this also applies to their children’s microbiota: while mothers pass on part of their flora during childbirth, fathers provide the other half. This transfer is all the more important when the child is born by c-section, where maternal flora is lacking.

The gut microbiota The ENT microbiota The vaginal microbiota Asthma and microbiota Probiotics Obesity

This is one of the downsides of c-sections: since the baby is not born vaginally, it has no time to taste (literally!) its mother’s vaginal and fecal bacteria. While this “meal” may seem unappetizing at first glance, it is nonetheless essential to the development of the child and its microbiota. Some even believe that the increased incidence of autoimmune diseases, asthma, and obesity in children born by c-section may be due to the fact that, deprived of this royal feast, newborns extracted from their mother’s womb via c-section may not receive all the good bacteria needed for their immune and neurological development. This is a serious concern, considering that one in four children is born by c-section.

Fathers are the solution

Research has therefore been looking for solutions, including the transfer of vaginal flora from mother to child: within two minutes of birth, the child’s mouth, face, and body are swabbed with a gauze previously placed in the maternal vagina. However, the results have not lived up to expectations.

1/4 Cesarean deliveries currently account for over a quarter of births worldwide ¹

60% of women are unaware that the mode of delivery can affect the gut microbiota of newborns. ²

Fortunately, research published in mid-2024 suggests a much easier solution: fathers. In fact, while the mother is the primary provider of gut flora in the child’s first days, the father (and all relatives) also plays a role, and more and more as the months go by.

By the child’s first birthday, the father’s contribution has even become equal to that of the mother. This has a major advantage: whereas maternal bacterial donations depend on the mode of delivery, the father represents a stable source. Another advantage is that paternal and maternal bacteria are distinct, with the two complementary sources building a solid microbiota for the newborn.

Fecal microbiota transfer and probiotics

The team went even further, proposing additional boosts to newborns’ gut flora. Gone are the days of gauze laden with mothers’ vaginal microbiota: a transfer of maternal fecal flora appears to be far more effective in ensuring that a child born by c-section quickly builds up a healthy gut flora, capable of resisting the onslaught of pathogens.

Moreover, nature’s intricate design ensures that the bacteria that take hold are mainly those capable of breaking down the sugars in breast milk. These strains may be developed in future probiotics to boost the flora of very young babies.

Gut microbiota: our immune system’s best friend

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Gut bacteria turn stress hormones into progestins hormones: a surprising role for hydrogen gas

Researchers found that gut bacteria can flip stress hormones into progestins hormones - all powered by hydrogen gas! This unexpected discovery could reshape how we think about gut health, pregnancy, and even mental well-being.

In a groundbreaking discovery, researchers have found that certain gut bacteria can convert stress-related hormones into progestins hormones, all with the help of hydrogen gas. This research, led by Megan McCurry and her team 1 , reveals how gut microbes, specifically Gordonibacter pamelaeae and Eggerthella lenta, metabolize glucocorticoids - hormones produced by the body in response to stress - into progestins, which play crucial roles in pregnancy and brain function. The findings, published in Cell, open new doors for understanding how the gut microbiome influences women’s health, especially during pregnancy.

The unexpected role of hydrogen gas

One of the most surprising discoveries in this study is the role hydrogen gas plays in gut bacterial metabolism. Traditionally seen as a byproduct of digestion, hydrogen gas is now shown to be a key factor that boosts the bacteria's ability to convert glucocorticoids into progestins. The research demonstrates that hydrogen gas production by gut bacteria such as E. coli creates an environment that promotes this steroid transformation. When these bacteria are grown together, they produce significantly more hydrogen, which facilitates the conversion process.

This revelation that hydrogen can drive such important hormonal transformations highlights an entirely new aspect of gut microbiome function. Until now, hydrogen’s role in gut metabolism was mostly associated with gas production and fermentation, but this study sheds light on its critical influence in secondary metabolism, particularly in steroid hormone processing.

Bacterial progestin production: a potential link to pregnancy and mental health

The research also reveals that the gut bacteria's conversion of stress hormones into progestins has physiological relevance, especially during pregnancy. The study found that levels of bacterial progestins were significantly higher in the feces of pregnant women compared to non-pregnant women. One such progestin, allopregnanolone, is already FDA-approved as a treatment for postpartum depression, hinting at the potential impact of this bacterial process on maternal mental health.

Progestin levels in feces were found to be two orders of magnitude higher in pregnant individuals compared to non-pregnant individuals.

This link between bacterial hormone production and pregnancy is crucial, as progestins not only regulate pregnancy but also act as neurosteroids that affect brain function. The study suggests that these bacterial transformations could influence not just pregnancy outcomes but also postpartum conditions like depression and anxiety.

Gut microbes: the new endocrine players?

Beyond pregnancy, the implications of these findings extend to broader health contexts. If gut bacteria can transform stress hormones into bioactive compounds that affect the brain and reproductive systems, this raises exciting possibilities for how we understand gut health’s impact on overall hormone regulation. The discovery suggests that the gut microbiome acts almost like an additional endocrine organ, capable of influencing hormonal balance and mental health.

Recognizing the microbiome’s role in hormone regulation could pave the way for innovative treatments targeting gut bacteria. In the future, microbial therapies might help manage conditions related to hormone imbalances, such as polycystic ovary syndrome (PCOS), mood disorders, or even fertility issues.

Conclusion

In summary, this research reveals that gut bacteria, when aided by hydrogen gas, can convert stress-related hormones into pregnancy hormones with profound potential effects on women’s health. The findings not only change our understanding of gut microbiota but also open new avenues for clinical interventions in hormone-related health conditions.

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News Gastroenterology

Dengue and Zika: protecting mosquitoes to protect humans

Inoculating mosquitoes by introducing the Rosenbergiella_YN46 bacterium into their digestive system: a realistic and sustainable biological control strategy for reducing the transmission and prevalence of flaviviruses in the wild?

Mosquito-borne flaviviruses such as Zika, Dengue, West Nile virus, and yellow fever are potentially fatal to humans. The cause for concern is greater still given that climate change and phenomena such as El Niño favor such (sidenote: Vector-borne disease A disease where a pathogen is transmitted to a host (human or animal) by the bite of a vector, such as mosquitoes, flies, ticks, or fleas. 
Vector-borne diseases account for around 17% of all infectious diseases worldwide, with the WHO estimating that 80% of the world’s population lives at risk from at least one vector-borne disease.
 
Explore https://www.pasteur.fr/fr/innovation/toute-actualite/actualites-innovation/comb… )
, while mosquito control and population biological control campaigns have had limited impact to date.

What about adopting an entirely different strategy? Modifying the mosquito’s gut microbiota may protect it from infection and hence prevent it from transmitting the virus to mammals, including humans.

A tenfold increase in cases worldwide

Between 2000 and 2019, the World Health Organization (WHO) 1 reported a tenfold increase in the number of dengue fever cases worldwide, from 500,000 to 5.2 million.

After a slight decline during the COVID-19 pandemic, an upsurge in dengue fever cases was observed worldwide in 2023.

Bacterium that protects both mosquito and human

In this study, Chinese researchers 2 isolated 55 bacteria living in the digestive system of female Aedes albopictus mosquitoes, the main vector of Dengue fever, from insects captured in southern Yunnan. These bacteria included Rosenbergiella_YN46 (so named because it was identified in Yunnan), which, inoculated at a dose of 1.6 × 103 CFU (colony forming units), provided A. albopictus with persistent protection against (sidenote: Flavivirus is a genus of viruses which consists of >70 members including several that are considered significant human pathogens. Transmitted to humans through the bite of infected mosquitoes, Flaviviruses display a broad spectrum of diseases that can be roughly categorised into two phenotypes:
- systemic disease involving haemorrhage (Dengue and yellow Fever virus)
- and neurological complications (West Nile and Zika viruses)
Explore https://pubmed.ncbi.nlm.nih.gov/34696709/ )
.

How does this gut bacterium found in flower nectar enable A. albopictus and Aedes aegypti mosquitoes to resist infection by Dengue and Zika? By secreting a glucose dehydrogenase that converts glucose into gluconic acid, rapidly acidifying the mosquito’s intestinal lumen (pH < 6.5 after a blood meal). This acidic environment irreversibly modifies the protein envelope of flavivirus virions, preventing them from entering the mosquito’s gut epithelial cells.

390 million With up to 390 million people infected each year, dengue fever is the most common mosquito-borne flavivirus worldwide. ²

223,000 There were 223,000 confirmed cases of Zika infection in the Pacific Islands and the Americas between 2015 and 2017. ²

Effective strategy on a large scale?

But the researchers’ work did not stop there. Noting that Dengue prevalence varied between prefectures of Yunnan province, they wanted to see whether this phenomenon went hand in hand with an uneven presence of the bacterium. Indeed it did. Rosenbergiella_YN46 was more prevalent in the digestive system of mosquitoes from Wenshan (91.7%) and Pu’er (52.9%) prefectures, where only a few isolated cases of Dengue have been reported, while the bacterium was rare in mosquitoes from Xishuangbanna (6.7%) and Lincang (0%) prefectures, where Dengue is endemic. 

Complementary experiments under semi-field conditions provide hope of a possible (sidenote: biological control Biological control is an environmentally sound and effective means of reducing or mitigating pests and pest effects through the use of natural enemies.  Explore https://www.sciencedirect.com/journal/biological-control ) : sugar water laced with Rosenbergiella_YN46 suffices to contaminate the mosquito, with the bacterium then efficiently transmitted (sidenote: Transstadial transmission The vector (here, the mosquito) retains an agent (in this case, the flavivirus) in its body as it passes from one stage of development to another (here, from aquatic larva to winged adult). Explore Źródło ) , and from generation to generation (in mosquitoes, the gut microbiota is transmitted by the female mosquito to its offspring through larval and adult feeding).

Furthermore, introducing Rosenbergiella_YN46 into the aquatic habitat of larvae, or importing adults already carrying the bacterium, may reduce Dengue transmission in areas where the disease is endemic.

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News Gastroenterology General Medicine Dermatology

Menopause: unbalanced vaginal microbiota may promote inflammation

A study on menopausal women suggests that it may one day be possible to reduce inflammation of the vaginal mucosa by modulating the vaginal microbiota. Crucially, this could reduce the risk of infection and cervical cancer.

The vaginal microbiota

At menopause, the vaginal microbiota may play a key role in women’s gynecological health. 

Under normal circumstances, lactic acid bacteria called Lactobacillus, found in abundance in the vaginal flora, acidify the vaginal environment, helping to balance the microbiota.

45 to 55 the age at which the menopause transition most often begins ¹

87% of women experience at least one symptom in addition to the cessation of menstruation ²

20-25% suffer severe disorders affecting quality of life ²

How menopause modifies vaginal microbiota 

During the premenopause (the period before menstruation ceases for good, see text box), the drop in estrogen levels leads to a reduction in the glycogen content of the mucosal cells, glycogen being the preferred food of Lactobacillus.

Less well nourished, Lactobacillus become less abundant and lose their dominant position in the flora, which can lead to imbalances in the vaginal microbiota ( (sidenote: Dysbiosis Generally defined as an alteration in the composition and function of the microbiota caused by a combination of environmental and individual-specific factors. Levy M, Kolodziejczyk AA, Thaiss CA, et al. Dysbiosis and the immune system. Nat Rev Immunol. 2017;17(4):219-232.   ) ). The reduction in sex hormones is also associated with a harmful increase in microbial diversity. 

55% of women are aware that from childhood to menopause, a woman's vaginal microbiota does not remain the same.

Several studies have shown that the loss of Lactobacillus dominance and the increase in bacterial diversity are associated with inflammation of the vaginal mucosa. Inflammation increases the risk of infection, particularly with sexually transmitted infections (STIs), and of precancerous cervical lesions.

While the link between changes in the vaginal microbiota and inflammation has been shown in premenopausal women, no study has yet been carried out to determine whether it persists in the postmenopausal period (see text box). 

Menopause, premenopause, postmenopause, or perimenopause: what’s the difference?

The menopausal transition, characterized by the gradual decline in female sex hormones, takes place over a number of years.

  • The premenopause (or perimenopause) is the pivotal period prior to menopause. It precedes the cessation of menstruation, when the infamous symptoms of menopause appear (hot flushes, vaginal dryness, sleep disorders, etc.). It lasts from two to eight years, or around four years on average.
  • Menopause is the final cessation of menstruation. It generally occurs between the ages of 45 and 55.
  • Postmenopause is the period following menopause. It starts about one year after menopause. 

Modulating the vaginal microbiota to preserve health?

To document this, a team of US researchers used data from 119 postmenopausal women (average age 61) who had taken part in a clinical trial comparing the effects of estrogen or a moisturizing cream on the vaginal flora. 

They analyzed both bacterial populations and markers of inflammation (cytokines) in the volunteers’ vaginal fluids to determine whether these two parameters were linked. 3

They found that the women whose vaginal microbiota was the most diverse, or the most depleted in Lactobacillus, had the highest levels of cytokines. These two characteristics of the vaginal microbiota are therefore associated with inflammation, as in premenopausal women.

The vaginal microbiota

Learn more

These results are interesting, since they suggest that it may one day be possible, by modulating the vaginal microbiota of postmenopausal women, to limit inflammation of the vaginal mucosa, and thus act preventively to preserve their health.

What is genitourinary syndrome of menopause (GSM)?

Since 2014, this term has replaced “vulvovaginal atrophy” or the overly restrictive “vaginal dryness”, and is used to describe specific menopausal symptoms linked to the drop in estrogen levels occurring at menopause 4 :

  • Genital symptoms: dryness, burning, and irritation;
  • Sexual symptoms: lack of lubrication, discomfort, and pain;
  • Urinary symptoms: urinary urgency, recurrent urinary tract infections, pain, discomfort, and burning when urinating (dysuria)

According to a meta-analysis published in 2022 5, GSM affects:

  • more than half of postmenopausal women (55.1%); 
  • one-third of perimenopausal women (31.9%); 
  • one in five premenopausal women (19.2%).
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