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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. The small colonies often give ...
The anginosus group streptococci are members of the viridans streptococci group. [1] They have been implicated as etiologic agents in a variety of serious purulent infections, but because of their heterogeneous characteristics, these organisms may be unrecognized or misidentified by clinical laboratorians. [ 2 ]
Based on DNA homology and whole-cell polypeptide-pattern study findings supported by phenotypic characteristics, the DNA homology group of microaerobic streptococci that was formerly known as Streptococcus anginosus or Streptococcus milleri is now composed of three distinct species: S. anginosus, S. constellatus, and S. intermedius.
Streptococcus intermedius is an aerotolerant anaerobic commensal bacterium and a member of the Streptococcus anginosus group. The S. anginosus group, occasionally termed “ Streptococcus milleri group” (SMG) display hemolytic and serologic diversity, yet share core physiological traits.
The distinction from the Streptococcus anginosus group (Lancefield A, C, G or F) can be made by colony size and Voges Proskauer test (VP); the S.anginosus group being VP positive. Streptococcus equi contains Lancefield group C, and Streptococcus canis harbours group G, but unlike S. dysgalactiae, they are both Hyaluronidase negative. [34]
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Streptococcus constellatus is a species of Streptococcus [2] bacteria that is part of the normal flora in the oral cavity, urogenital region, and intestinal tract. However, it can frequently cause purulent infections in other parts of the body. [ 3 ]
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