Definitions for viridans streptococci

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  1. Viridans streptococci

    The viridans streptococci are a large group of commensal streptococcal bacteria species that are either α-hemolytic, producing a green coloration on blood agar plates, or nonhemolytic. The pseudotaxonomic non-Linnean term Streptococcus viridans is often used to refer to this group of species, but writers that do not like to use the pseudotaxonomic term prefer the terms viridans streptococci or viridans streptococcal species. These species possess no Lancefield antigens. In general, pathogenicity is low.

U.S. National Library of Medicine

  1. Viridans Streptococci

    A large heterogeneous group of mostly alpha-hemolytic streptococci. They colonize the respiratory tract at birth and generally have a low degree of pathogenicity. This group of species includes STREPTOCOCCUS MITIS; STREPTOCOCCUS MUTANS; STREPTOCOCCUS ORALIS; STREPTOCOCCUS SANGUIS; STREPTOCOCCUS SOBRINUS; and the STREPTOCOCCUS MILLERI GROUP. The latter are often beta-hemolytic and commonly produce invasive pyogenic infections including brain and abdominal abscesses.

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"viridans streptococci." STANDS4 LLC, 2015. Web. 29 Nov. 2015. < streptococci>.

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