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Streptococcus anginosus : ウィキペディア英語版 | Streptococcus anginosus
''Streptococcus anginosus'' is a species of ''Streptococcus''. Together with ''Streptococcus constellatus'' and ''Streptococcus intermedius'' they constitute the ''anginosus'' group, which is sometimes also referred to as the ''milleri'' group after the previously assumed single but later refuted species ''Streptococcus milleri''. Phylogenetic relatedness of ''S. anginosus, S. constellatus, and S. intermedius'' has been confirmed by rRNA sequence analysis. ==General characteristics== The majority of ''Streptococcus anginosus'' strains produce acetoin from glucose, ferment lactose, trehalose, salicin, and sucrose, and hydrolyze esculin and arginine. Carbon dioxide can stimulate growth or is even required for growth in certain strains. ''Streptococcus anginosus'' may be beta-hemolytic or nonhemolytic. Among the nonhemolytic strains, certain ones produced the alpha reaction on blood agar. However, of isolates examined in one study, 56% were nonreactive, 25% were beta reactive, and only 19% were alpha reactive.
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