Viridans streptococci

• abstract: 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 (hence the name "viridans", from Latin "vĭrĭdis", green), or nonhemolytic. The pseudotaxonomic non-Linnean term Streptococcus viridans is often used to refer to this group of species, but writers who do not like to use the pseudotaxonomic term (which treats a group of species as if they were one species) prefer the terms viridans streptococciDorland's Illustrated Medical Dictionary, headword "streptococcus", subentry "viridans streptococci".

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