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Pseudorabies - Fact Sheet

What is pseudorabies?

Pseudorabies, also known as Aujeszky's disease, is a viral disease causing neurological and respiratory disease in swine, which are the natural hosts of the virus.

It sporadically infects other species (cattle, sheep, goats, dogs, cats, mink, foxes, raccoons and rats), causing a fatal neurological disease with rabies-like signs and severe itching. Another name for the disease in cattle is "mad itch".

Is pseudorabies a risk to human health?

No. There is no human health risk associated with pseudorabies.

What are the clinical signs of pseudorabies?

Swine show different signs of the virus depending on age, with the youngest animals being the most severely affected:

Infections in species other than pigs are almost always fatal. Symptoms may include intense itching, scratching and self mutilation, an inability to rise, incoordination, paralysis and rapid death.

Where is pseudorabies found?

Pseudorabies has been reported in most countries, with the exception of Canada, Greenland, Australia and any African country.

The U.S. has been actively working towards eradication of the disease since 1989, and by 2004, domestic swine in all states were considered free of the virus. However, the pseudorabies virus is known to be present in feral swine and these animals pose an on-going risk to the domestic population.

How is pseudorabies transmitted and spread?

Pseudorabies is highly contagious in pigs and the disease will spread rapidly throughout an entire herd. The virus is spread mainly via the respiratory route and nose-to-nose contact. Piglets can become infected in utero and through milk from an infected sow.

Pseudorabies is a herpes virus; once an animal is infected, it remains infected for life and it may not demonstrate any signs of disease even though it is shedding the virus.

Transmission can also occur by contaminated drinking water, coming in contact with contaminated clothing, footwear, or equipment, especially in cool, damp weather which helps virus survival. There is evidence of airborne transmission.

How is pseudorabies diagnosed?

Laboratory testing is done on tissue and blood samples to detect the virus and its antibodies.

How is pseudorabies treated?

There is no specific treatment for the disease. Vaccination can prevent illness and alleviate clinical signs in acute cases, and it is used extensively in some countries to control the disease. In the U.S., vaccination is part of the pseudorabies eradication program.

What is done to protect Canadian livestock from pseudorabies?

The Canadian Food Inspection Agency (CFIA) imposes strict regulations on the import of animals and animal products from countries where pseudorabies is known to occur. These regulations are enforced through port-of-entry inspections done either by the Canada Border Services Agency or the CFIA.

Pseudorabies is a "reportable disease" under the Health of Animals Act. This means that all suspected cases must be reported to the CFIA for immediate investigation by inspectors.

How would the CFIA respond to an outbreak of pseudorabies in Canada?

Canada's emergency response strategy to an outbreak of pseudorabies would be to:

In an effort to eradicate pseudorabies, the CFIA would use its "stamping out" policy, which includes:

Owners whose animals are ordered destroyed may be eligible for compensation.

Additional information

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