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  2. Gastroenteritis and other types of infectious diarrhea: when your microbiota is struggling
  3. Diarrhea and use of antibiotics: case study
The power of your gut

Diarrhea and use of antibiotics: case study

Gastroenteritis
The gut microbiota Antibiotic-associated diarrhea Infectious gastroenteritis

Diarrhea is a common side effect of antibiotics, and it may compromise their efficacy, especially if the treatment is prematurely withdrawn. Antibiotic-induced diarrhea is usually benign, but it may mask a more serious intestinal infection.

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About this article

Created 23 September 2019
Updated 04 December 2023

Antibiotics not only eradicate pathogenic microorganisms responsible for infection, but they can also destroy some bacteria that are beneficial to the gut microbiota. They always cause a more or less significant imbalance within this ecosystem. This ecosystem becomes less rich and less diversified, and is no longer able to properly carry out its protective functions2.

Antibiotics are not automatic anymore15  !

Between 10 and 30% of patients treated with antibiotics experience a change in their intestinal transit within 3-5 days of treatment, most often in the form of diarrhea16. Most of the time, this diarrhea is purely functional, caused by the antibiotic-induced dysbiosis. It usually presents without fever, it is short lived, not severe, and in most cases, it regresses once antibiotics are discontinued, or in the following weeks. However, dysbiosis starts in the first 24 hours of antibiotic treatment and lasts up to six weeks after its conclusion. New microorganisms, close to the initial strains but not necessarily identical, slowly re-colonize the intestines and create a new balance, although it often remains incomplete.

A new route for pathogens

But sometimes, the mucus layer, true line of defense of our intestines, has been so weakened that the body becomes more vulnerable to pathogens. In 10 to 20% of cases, diarrhea results from the colonization of the microbiota by Clostridium difficile. This bacterium is very widespread in hospitals and nursing homes, and elderly people are particularly vulnerable: in these facilities, up to 20% of residents (50% in cases of long-term stay) can host this bacterium in their intestines without showing any symptom (asymptomatic carriers). Although most cases of C. difficile diarrhea resolve once the antibiotics are discontinued, most severe forms could occur (pseudomembranous colitis and fulminant colitis, especially in people over 65 years old17). In the US, for instance, this infection is responsible for around 30,000 deaths/year18. The families of antibiotics that are often blamed are penicillins, some generations of cephalosporins, fluoroquinolones and clindamycins. To stop this vicious circle, stool transplant (transplant of healthy microbiota into the GI tract of a patient) could be a therapeutic alternative to antibiotics in order to repopulate the microbiota and restore the gut barrier.

Collective food poisoning

Collective food poisoning20 occurs when there are at least two clustered cases with identical symptoms (usually gastrointestinal) and caused by the same contaminated food.

  • Symptoms
    Abdominal pain, diarrhea (bloody or not), nausea,
    vomiting, headache, fever, muscular pain
  • Duration of the episode
    Quick recovery if hygiene is adequate
  • Responsible bacteria
    Salmonella spp., E. coli, Shigella spp., Yersinia spp.,
    Listeria monocytogenes, Staphylococcus aureus,
    Clostridium spp., Bacillus cereus
    and fungal toxins
    (mycotoxins)
  • Possible complications
    Meningitis in case of Listeria monocytogenes
    infection in vulnerable or weakened subjects
    (newborns, pregnant women, elderly,
    immunocompromised individuals)
  • Incidence
    Has been rising since the 1980’s because of the
    increase of fresh produce consumption; decrease
    of serious cases thanks to a better management
    of hygiene conditions in food production,
    transformation and distribution processes.
Sources

2 Beaugerie L, Sokol H. Acute infectious diarrhea in adults: epidemiology and management. Presse Med. 2013 Jan

8 Hojsak I. Probiotics in Children: What Is the Evidence? Pediatr Gastroenterol Hepatol Nutr. 2017 Sep

15 Piche T. Diarrhée associée aux antibiotiques. Hépato-Gastro & Oncologie Digestive. 2002;9(5):339-44

16 Bartlett JG. CLinical practice. Antibiotic-associated diarrhea. N Engl J Med 2002;346:334-9. Cited in Beaugerie L, Sokol H. Acute infectious diarrhea in adults: epidemiology and management. Presse Med. 2013 Jan

17 Castrillon B et al. Infections à Clostridium difficile : spécificités chez le sujet âgé. Rev Med Suisse. 2013; 9 : 2044-8

18 Lessa FC et al. Burden of Clostridium difficile infection in the United States. N Engl J Med. 2015 Jun 11

20 Yeni F et al. Most Common Foodborne Pathogens and Mycotoxins on Fresh Produce: A Review of Recent Outbreaks. Crit Rev Food Sci Nutr. 2016 Jul 3

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Microbiome Flora

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    Gastroenteritis and other types of infectious diarrhea: when your microbiota is struggling
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      • Rotavirus and norovirus are to blame
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      • Expert Interview : Dr Julie Lemale
    Created 23 September 2019
    Updated 04 December 2023

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