Brucellosis.

Brucellosis is common worldwide in a variety of animals and is markedly underreported in man. Brucella abortus seems to be decreasing in cattle herds, but new animal reservoirs are being discovered. Human infection presents a difficult diagnostic challenge because of its protean manifestations and multiplicity of organ involvement. Symptoms vary, but fever, chills, weakness and weight loss are common. Several antibiotics are effective.