A genus of encapsulated, nonmotile bacteria (family Brucellaceae) containing short, rod-shaped to coccoid, gram-negative cells. These organisms do not produce gas from carbohydrates and are parasitic. They invade all animal tissues and infect the genital organs, the mammary gland, and the respiratory and intestinal tracts; are pathogenic for humans and various species of domestic animals. The type species is Brucella melitensis.
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Examples: glitazone, GI cocktail, etc.