<prompt> Brucella abous primarily affectsDogCattleSwineGoat  <response>: Ans. is b i.e., Cattle Human brucellosis is a zoonosis, acquired from animals directly or indirectly. The animals that commonly act as sources Sheep, goat and camel Cattle or Buffalo Swine Dog Br melitensis Br. abous Br suis Br canis 