Brucella abortus

**Semantic type:** Bacterium

**Definition:** A species of aerobic, Gram-negative, coccobacilli shaped bacteria assigned to the phylum Proteobacteria. This species is nonmotile, non-spore forming, reduces nitrates, produces hydrogen sulfide, is positive for catalase, oxidase and urease, grows in basic fuchsin but not thionine, and is positive for Tiblisi and Weybridge phage lysis. B abortus is found in cattle where it causes abortions and causes brucellosis in humans.

**Synonyms:** - BRUCELLA ABORTUS