| Streptococcus lactis R factor | 10-formylpteroic acid;a folic acid factor for certain bacteria. Synonym: SLR factor, Streptococcus lactis R factor. (05 Mar 2000) |
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| Streptococcus M antigen | The somatic antigen associated with virulence and type specificity of group A streptococci. Synonym: M protein. (05 Mar 2000) |
| Streptococcus mitis | A species found in the human mouth, throat, and nasopharynx; ordinarily, it is not considered to be pathogenic, but this organism may be recovered from ulcerated teeth and sinuses and from blood and heart lesions in cases of subacute endocarditis. (05 Mar 2000) |
| streptococcus mutans | A polysaccharide-producing species of streptococcus isolated from human dental plaque. (12 Dec 1998) |
| streptococcus oralis | A species of gram-positive, coccoid bacteria that is numerous in the mouth and throat. It is a common cause of endocarditis and is also implicated in dental plaque formation. (12 Dec 1998) |
| streptococcus phages | Viruses whose host is streptococcus. (12 Dec 1998) |
| streptococcus pyogenes | A species of gram-positive, coccoid bacteria isolated from skin lesions, blood, inflammatory exudates, and the upper respiratory tract of humans. It is a group a haemolytic streptococcus that can cause scarlet fever and rheumatic fever. Unlike the docile strains that cause strep throat, however, the virulent strains penetrate deep into the body, with catastrophic results. It has been demonstrated that invasive streptococcus a infections can trigger a toxic shock syndrome, chew up muscle (myositis), or destroy the sheath that covers the muscle (fasciitis, necrotizing). (12 Dec 1998) |
| Streptococcus salivarius | A species found in the human mouth, throat, and nasopharynx. (05 Mar 2000) |
| 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 suis | A species of streptococcus isolated from pigs. It is a pathogen of swine but rarely occurs in humans. (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) |
| acute interstitial pneumonia | A severe and usually fatal form of pneumonia occurring primarily in infants usually considered a form of hypersensitivity pneumonitis. (05 Mar 2000) |