TABLE 3.
Identification of non-beta-hemolytic gram-positive cocci in chainsa
| Species or group | Antigen | Opt | BS | BE | Na | Pyr | Esc | Vp | Man | Mel | Sbl | Tre | St | Dx | Origin |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S. pneumoniae | pn | + | + | − | − | − | v | − | − | + | − | v | − | − | Human |
| S. equinus (S. bovis) | D | − | − | + | − | − | + | + | − | − | − | v | − | − | Equine, bovine |
| S. gallolyticus (S. bovis I) | D | − | − | + | − | − | + | + | + | + | − | + | + | + | Human, koala bovine |
| S. pasteurianus (S. bovis II.2) | D | − | − | + | − | − | + | + | − | + | − | + | − | − | |
| S. infantarius (S. bovis II/1) | D(v) | − | − | − | − | − | v | + | − | + | − | − | + | − | Human, bovine |
| S. lutetiensis | D(v) | − | − | + | − | − | + | + | − | − | − | − | v | − | |
| S. suisb | Type 1-35 (R,S,T) | − | − | − | − | − | + | − | − | − | − | + | + | − | Swine, human |
| Viridans streptococci | A, C, G, F, none | − | − | − | − | − | v | v | v | v | v | v | v | v | Human |
| Other streptococci and genera | Unknown | − | − | v | v | v | v | v | v | v | v | v | v | v | Animal, human |
a
Abbreviations: pn, pneumococcal typing antiserum or Omni serum; letters, Lancefield group antigen; Opt, optochin; BS, bile solubility; BE, bile-esculin reaction; Na, growth in 6.5% NaCl broth; Pyr, pyrrolidonylarylamidase reaction; Esc, hyrolysis of esculin; Vp, Voges-Proskauer reaction; Man, Mel, Sbl, Tre, acidification of mannitol, melibiose, sorbitol, and trehalose broths; respectively; St, hydrolysis of starch; Dx, production of extracellular polysaccharide. See footnote in Table 2 for positive and negative reactions.
b
Note that the only way to differentiate S. suis from viridans streptococci is by serologic typing.