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- Aerobic, intraceullular gram negative coccobacilli causing brucellosis.
- Grows on a variety of media, usually within 24-48h of inoculation.
- Zoonotic disease, most important species for human infections:
- B. abortus (cattle, buffalo)
- B. melitensis (goat, sheep, camel)
- B.suis (swine, wild animals)
- B. canis (dog)
- Less common:
- B. ovis (sheep)
- B. neotomae (desert and wood rats)
- Three marine species also described afflicting marine mammals (B. delphini, B. pinnipediae, B. cetaceae) have been described causing human disease.
- Most human disease due to B. arbortus and B. melitensis.