<unk>  is a genus of Gram-positive facultative anaerobic bacteria. They are a major part of the<unk> ic acid bacteria group, named as such because most of its members convert<unk> ose and other sugars to<unk> ic acid. They are common and usually benign.  In humans they are present in the vagina and the gastrointestinal tract, where they are symbiotic and make up a small portion of the gut flora. Many species are prominent in decaying plant material. The production of<unk> ic acid makes its environment acidic which inhibits the growth of some harmful bacteria. Several members of the genus have had their genome sequenced.
Lactobacillus
Bacteroides
Streptococcus
Coccus
Arcobacter
Enterococcus
Proteus
Clostridium