Streptococcus alactolyticus

**Semantic type:** Bacterium

**Definition:** A species of facultatively anaerobic, Gram positive, cocci shaped bacteria in the phylum Firmicutes. This species is positive for urease, alpha hemolysis, esculin hydrolysis and Lancefield group D and negative for gelatinase, caseinase, catalase, arginine deamination and growth in 6.5% NaCl. It can ferment glucose, cellobiose, fructose, galactose, maltose, mannose, salicin and sucrose but not arabinose, mannitol, lactose, glycerol, raffinose, ribose, sorbitol, trehalose or xylose. S. alactolyticus is found in the intestinal tract of pigs, is a cause of zoonotic infections and has rarely been isolated from human clinical specimens.

**Synonyms:** - STREPTOCOCCUS ALACTOLYTICUS