Which is the anaerobic bacteria that is commonly found in cervix or vagina which keeps the pH low and protect from other bacterial infections?: (A) Lactobacilli, (B) Gardnerella, (C) Mobilincus, (D) Clostridium
Answer is A. Lactobacillus or Doderlein's bacillus is the most common organism found in vagina. Lactobacilli are gram-positive non-spore-forming rods found as members of the normal flora in the mouth, colon, and female genital tract. In the mouth, they may play a role in the production of dental caries. In the vagina, they are the main source of lactic acid, which keeps the pH low. Ref: Levinson W. (2012). Chapter 27. Minor Bacterial Pathogens. In W. Levinson (Ed), Review of Medical Microbiology & Immunology, 12e.