Lactobacillus species that produce high amounts of D-lactic acid reduce the risk of infection by Chlamydia trachomatis. Those that produce high amounts of L-lactic acid do not confer protection against infection.
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N. R. Gough, Antibiotic Treatment Reshapes the Vaginal Microbiome. BioSerendipity (19 August 2019). https://www.bioserendipity.com/antibiotic-treatment-reshapes-the-vaginal-microbiome/