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Pseudorabies, also known as Aujeszky's disease, is a viral disease causing inflammation of the brain and spinal cord and respiratory infection in domestic and wild animals. The pig is the only natural host for pseudorabies virus; therefore, the disease is of greatest economic consequence to the pork industry. Sporadic fatal cases have been known to occur in cattle, sheep, goats, dogs, cats, mink, foxes, raccoons, and rats. Over the years, pseudorabies disease has increased in incidence and severity in many intensive pig-farming regions in the world, possibly due to changes in swine management practices towards highly intensive production systems.

In Canada, pseudorabies is a reportable disease under the Health of Animals Act, and all cases must be reported to the Canadian Food Inspection Agency (CFIA).

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