| Streptococcus salivarius | A species found in the human mouth, throat, and nasopharynx. (05 Mar 2000) |
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| streptococcus sanguis | A gram-positive organism found in dental plaque, in blood, on heart valves in subacute endocarditis, and infrequently in saliva and throat specimens. L-forms are associated with recurrent aphthous stomatitis. (12 Dec 1998) |
| streptococcus sobrinus | A species of gram-positive, coccoid bacteria isolated from the human tooth surface. Strains have been shown to be cariogenic in experimental animals and may be associated with human dental caries. (12 Dec 1998) |
| Streptococcus uberis | A species causing mastitis in cattle. (05 Mar 2000) |
| Streptococcus viridans | A name applied not to a distinct species but rather to the group of alpha-haemolytic streptococci as a whole; viridans streptococci have been isolated from the mouth and intestines of humans, the intestines of horses, the milk and faeces of cows, milk and milk products, and the sputum and lungs in cases of primary atypical pneumonia. (05 Mar 2000) |
| Streptococcus zooepidemicus | Former name for Streptococcus equi zooepidemicus. (05 Mar 2000) |