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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 ]
The system, created by Rebecca Lancefield, was historically used to organize the various members of the family Streptococcaceae, which includes the genera Lactococcus and Streptococcus, but now is largely superfluous due to explosive growth in the number of streptococcal species identified since the 1970s. [2]
Streptococcus anginosus in the gut was independently associated with 20% higher odds of stroke after controlling for vascular risk factors. Anaerostipes hadrus—a gut bacteria associated with ...
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.
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]
The viridans streptococci are a large group of commensal streptococcal Gram-positive bacteria species that are α-hemolytic, producing a green coloration on blood agar plates (hence the name "viridans", from Latin "vĭrĭdis", green), although some species in this group are actually γ-hemolytic, meaning they produce no change on blood agar. [1]
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