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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 (hence the name "viridans", from Latin "vĭrĭdis", green), or nonhemolytic. The pseudo-taxonomic term "Streptococcus viridans" is often used to refer to this group of species, but writers that do not like to use the pseudotaxonomic term (which treats a group of species as if they were one species) prefer the terms viridans streptococci〔Dorland's Illustrated Medical Dictionary, headword "streptococcus", subentry "viridans streptococci".〕 or viridans streptococcal species.
These species possess no Lancefield antigens. In general, pathogenicity is low.
==Identification==
Viridans streptococci can be differentiated from ''Streptococcus pneumoniae'' using an optochin test, as viridans streptococci are optochin-resistant; they also lack either the polysaccharide-based capsule typical of ''S. pneumoniae'' or the Lancefield antigens of the pyogenic members of the genus.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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