Streptococcus equinus

**Semantic type:** Bacterium

**Definition:** A species of facultatively anaerobic, Gram positive, cocci shaped bacteria in the phylum Firmicutes. This species is positive for Lancefield group D and esculin hydrolysis and negative for catalase, arginine deaminase, growth in 6.5% NaCl and pyrrolidonylarylamidase. It can ferment trehalose but not mannitol, melibiose or sorbitol. S. equinus is commensal in many animals and can be a human pathogen that causes a variety of opportunistic infections.

**Synonyms:** - STREPTOCOCCUS EQUINUS