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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