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Definition of Brucellosis

Medically reviewed by Min Clinic Staff | Updated: January 2026

Brucellosis: An infectious disease characterized by rising and lowering (undulant) fever, sweating, muscle and joint pains, and weakness. Brucellosis is caused by the bacterium Brucella, which can be transmitted in unpasteurized milk from cattle, sheep, and goats; cheese made from this unpasteurized milk; and contact with diseased animals. Antibiotics are used to treat Brucellosis. Also known as undulant fever.