Which zoonotic infection is associated with raw milk and dairy products and reservoirs including cattle, swine, and ovine?

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Brucellosis is the infection classically tied to raw milk and dairy products from infected livestock. Brucella bacteria live in cattle (Brucella abortus), swine (Brucella suis), and sheep/goats (Brucella melitensis), so milk from these animals can carry the organism if the animals are infected. In humans, infection after consuming unpasteurized dairy or through contact with infected animals causes a feverish illness that can be chronic if not treated. Pasteurization and controlling infection in livestock through vaccination and testing are key public health measures. While other pathogens can also be found in dairy products, the specific association with these three animal reservoirs makes brucellosis the best fit.