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] The pseudo-taxonomic 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 streptococci,[2]viridans group streptococci (VGS), or viridans streptococcal species.
These species possess no Lancefield antigens.[3] In general, pathogenicity is low.[4]
^Sinner, Scott W.; Tunkel, Allan R. (2015-01-01), Bennett, John E.; Dolin, Raphael; Blaser, Martin J. (eds.), "204 - Viridans Streptococci, Nutritionally Variant Streptococci, Groups C and G Streptococci, and Other Related Organisms", Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases (Eighth Edition), Philadelphia: W.B. Saunders, pp. 2349–2361.e2, doi:10.1016/b978-1-4557-4801-3.00204-6, ISBN 978-1-4557-4801-3, retrieved 2022-04-01
^Dorland's Illustrated Medical Dictionary, headword "streptococcus", subentry "viridans streptococci".
^Ryan KJ, Ray CG, eds. (2004). Sherris Medical Microbiology (4th ed.). McGraw Hill. pp. 293–4. ISBN 978-0-8385-8529-0.
^Viridans+Streptococci at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
and 28 Related for: Viridans streptococci information
The viridansstreptococci are a large group of commensal streptococcal Gram-positive bacteria species that are α-hemolytic, producing a green coloration...
Streptococcus pneumoniae and a group of oral streptococci (Streptococcus viridans or viridansstreptococci) display alpha-hemolysis. Alpha-hemolysis is...
called the mutans streptococci. This grouping of similar bacteria with similar tropism can also be seen in the viridansstreptococci, another group of...
that these streptococci constituted a single species was incorrect. The anginosus group streptococci are members of the viridansstreptococci group. They...
the Lancefield carbohydrate antigen: Streptococcus pneumoniae and viridansstreptococci. Group A - Streptococcus pyogenes Group B - Streptococcus agalactiae...
species of Streptococcus. Streptococcus vestibularis, member of the viridansstreptococci was first isolated from vestibular mucosa of human oral cavities...
further distinguish S. pneumoniae from viridansstreptococci as S. pneumoniae are bile soluble and viridansstreptococci are not. S. pneumoniae are the most...
optochin-sensitive, from the other, resistant alpha-hemolytic streptococci, sometimes called the viridansstreptococci because of the green colouration on blood agar...
abscess. Streptococcus pneumoniae can be differentiated from the viridansstreptococci, some of which are also alpha-hemolytic, using an optochin test...
strains they were studying. For her PhD thesis, Lancefield studied viridansstreptococci. Lancefield originally joined the lab of Hans Zinsser. Zinsser did...
bacterial endocarditis (SBE) is often due to streptococci of low virulence (mainly viridansstreptococci) and mild to moderate illness which progresses...
confirmatory. In 1961, a new type of viridansstreptococci was classified as "nutritionally variant streptococci" (NVS). In 1989, NVS was subdivided into...
often immediately following birth. Viridansstreptococci species are normal bacterial flora of the mouth. Viridans strep can cause temporary bacteremia...
the oropharyngeal area. Infections, when found, are similar to viridansStreptococci in range. Cases have been reported of endovascular infections (predominantly...
past, bacteremia caused by dental procedures (in most cases due to viridansstreptococci, which reside in oral cavity), such as a cleaning or extraction...
infection. Some colonizing bacteria, such as Corynebacteria sp. and Viridansstreptococci, prevent the adhesion and colonization of pathogenic bacteria and...
Schellenberger, W.; Eschrich, K. (2007–2008). "Rapid Identification of ViridansStreptococci by Mass Spectrometric Discrimination". Journal of Clinical Microbiology...
death in 1936. He died at his home, in Freeport, Illinois, from viridansstreptococci, after being ill for several months. 'Illinois Blue Book 1935-1936...
the mould on 23 September, and on 30 September tested it against viridansstreptococci, and confirmed the Oxford team's results. Meyer duplicated Chain's...
(2006). "Antimicrobial treatment of infective endocarditis caused by viridansstreptococci highly susceptible to penicillin: historic overview and future considerations"...
sialadenitis. Some common bacterial causes are S. aureus, S. pyogenes, viridansstreptococci and H. influenzae. Autoimmune conditions that can cause sialadenitis...
"ENDOPHTHALMITIS AFTER INTRAVITREAL INJECTION: The Importance of ViridansStreptococci". Retina. 31 (8): 1525–1533. doi:10.1097/IAE.0b013e318221594a. ISSN 0275-004X...
action on hemolytic streptococcus, Streptococcus pneumoniae and viridansstreptococci. Through experimental testing ambazone has shown antiseptic properties...
Less common bacterial pathogens include Streptococcus pyogenes, Viridansstreptococci, Streptococcus pneumoniae, Haemophilus influenzae, and Pseudomonas...
species is a member of the Viridansstreptococci group which are a large mixed-group of mostly alpha-hemolytic streptococci. The alpha-hemolytic bacteria...
G, Byers HL, et al. (March 2001). "Mannosidase production by viridans group streptococci". J. Clin. Microbiol. 39 (3): 995–1001. doi:10.1128/JCM.39.3...
Streptococcus oralis is a Gram positive viridans streptococcus of the Streptococcus mitis group. S. oralis is one of the pioneer species associated with...
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