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Streptococcus is a genus of gram-positive or spherical bacteria that belongs to the family Streptococcaceae, within the order Lactobacillales (lactic acid bacteria), in the phylum Bacillota. [2] Cell division in streptococci occurs along a single axis , thus when growing they tend to form pairs or chains, which may appear bent or twisted.
Streptococcus Streptococcaceae are a family of Gram-positive bacteria , placed within the order Lactobacillales . [ 1 ] Representative genera include Lactococcus , Lactovum , and Streptococcus .
Early described genera of bacteria include Vibrio and Monas, by O. F. Müller (1773, 1786), then classified as Infusoria (however, many species before included in those genera are regarded today as protists); Polyangium, by H. F. Link (1809), the first bacterium still recognized today; Serratia, by Bizio (1823); and Spirillum, Spirochaeta and ...
Streptococcus pyogenes is a species of Gram-positive, aerotolerant bacteria in the genus Streptococcus. These bacteria are extracellular , and made up of non-motile and non-sporing cocci (round cells) that tend to link in chains.
Bacteria of the genus Enterococcus, formerly known as group D streptococci, were classified as members of the genus Streptococcus until 1984 and are included in the original Lancefield grouping. [4] Many—but not all—species of streptococcus are beta-hemolytic .
Streptococcus mitis is a species of Gram-positive, mesophilic, alpha-hemolytic bacteria in the genus Streptococcus. These bacteria are facultative anaerobes , and made up of non-motile and non-sporing cocci (round cells) that are catalase negative .
High G+C Gram-positive bacteria Bacillati "Bipolaricaulota" Hao et al. 2018 KB1 "Acetothermia" (OP1) "Fraserbacteria" (RIF31) Bacillati: Deinococcota: Weisburg, Giovannoni & Woes 2021 Bacillati "Margulisiibacteriota" corrig. Anantharaman et al. 2016 "Saganbacteria" Bacillati: Cyanobacteriota: Oren, Mares & Rippka 2022 Blue-green algae ...
The pseudo-taxonomic term "Streptococcus viridans" is often used to refer to this group of species, but writers who do not like to use the pseudotaxonomic term (which treats a group of species as if they were one species) prefer the terms viridans streptococci, [2] viridans group streptococci (VGS), or viridans streptococcal species.