Causative organism Brucella sp smal(0.40.8×0.5-1.5μm), x non motile x non capsulated non spore forming s gram-ve coccobacilli. k Aerobic facultative intracellular bacteriaCausative organism: Brucella sp. * small (0.4-0.8 ×0.5-1.5μm), * non motile. * non capsulated, * non spore forming , * gram –ve coccobacilli. * Aerobic , * facultative intracellular bacteria