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Gynecology

Implication of vaginal microbiota in bacterial vaginosis and candidiasis

Vaginosis

Literature selection

By Pr Markku Voutilainen
Turku University Faculty of Medicine; Turku University Hospital, Department of Gastroenterology, Turku, Finland

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Gardnerella vaginalis bacteria. Coloured transmission electron micrograph (TEM) of Gardnerella vaginalis bacteria.

About this article

Created 25 August 2021
Updated 05 November 2021

Gardnerella and vaginal health: the truth is out there

Rosca AS, Castro J, Sousa LGV, et al. Gardnerella and vaginal health: the truth is out there. FEMS Microbiol Rev. 2020 Jan 1;44(1):73-105. 

Vaginal microbiota is classified in five major subtypes (community state types). Four of them are composed of Lactobacillus species. The vaginal innate immune system, epithelial cells, Toll-like receptors, and natural antimicrobial peptides are other components of the defensive system against pathogens. Lactobacillus genus has a central role in vaginal defense mechanisms via production of lactic acid and bacteriocins, and preventing adhesion of pathogenic bacteria. Bacterial vaginosis (BV) is characterized by an overgrowth of pathogens and a polymicrobial biofilm that adheres vaginal epithelium. Gardnerella spp. is the predominant specie at the biofilm and has the highest virulence.

BV is treated with metronidazole, clindamycin, or tinidazole. Many Gardnerella spp. isolates and other pathogens are resistant to metronidazole. Adjuvant therapy e.g. with Lactobacillus probiotics may increase the therapeutic effect of metronidazole. Studies to understand polymicrobial interactions among vaginal pathogens could lead to ecologically based treatments.

Associations between the vaginal microbiome and Candida colonization in women of reproductive age

Tortelli BA, Lewis WG, Allsworth JE, et al. Associations between the vaginal microbiome and Candida colonization in women of reproductive age. Am J Obstet Gynecol; 2020 May;222(5):471.e1-471.e9. 

Candida albicans (CA) is detected in vaginal microbiome in about 30% of women. Of 255 non-pregnant reproductive-aged women, 42 women (16%) were colonized by CA. The commonest vaginal microbiomes were classified as Lactobacillus crispatus-dominant (20%), L. iners-dominant (39%), and diverse (38%). Compared with white women and L. crispatus-dominant communities, CA was more common in black women and L. iners-dominant communities. In vitro, L. crispatus produced more lactic acid and inhibited more significantly pH-dependent growth of CA. The main result was that Lactobacillus species have different interactions with CA, and L. crispatus may prevent CA colonization more effectively than L. iners through higher lactic acid production.

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    Created 25 August 2021
    Updated 05 November 2021

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