<unk>  is a Gram-positive species of bacterium in the genus<unk> . It is associated with active dental caries lesions. It is also commonly found in fermenting animal and plant material. It has been found in sourdough. A few strains are considered probiotic or "friendly" bacteria in animals  and at least one strain has been applied to treat urogenital infections in women.  Some strains of lactobacilli formerly classified as<unk>  (such as RC-14) have since been reclassified as<unk>  reuteri. Commercialized strains of<unk>  used as probiotics include PCC and ME-3.
Lactobacillus fermentum
Bacillus subtilis
Clostridium sordellii
Clostridium tetani
Bacillus cereus
Staphylococcus saprophyticus
Lactococcus lactis
Clostridium beijerinckii