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domain Bacteria Streptococcus is a genus of coccus (spherical) gram-positive bacteria belonging to the phylum Firmicutes and the order Lactobacillales (lactic acid bacteria). Cell division along a single axis results in chains or pairs. Most of the 50 species are faculatative anaerobes. Disorders caused by Streptococcus include strep throat, pink eye, meningitis, bacterial pneumonia, endocarditis, and necrotizing fasciitis (flesh-eating infections). Human microbiota of the mouth, skin, intestine, and upper respiratory track include many streptococcual species that are not pathogenic.

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kingdom Bacteria
phylum Firmicutes
class Bacilli
order Lactobacillales
family Streptococcaceae
genus Streptococcus