Aujeszky's disease (also known as pseudorabies and mad itch) is caused by a herpesvirus, Herpesvirus suis. Although pigs are the reservoir host, other animals, for example cattle, sheep, dogs, cats and rats, can also be infected. These species are dead end hosts, however, and do not generally transmit the disease themselves, although cats and dogs may shed virus in their oral and nasal secretions.

Infection in dogs and cats is usually associated with contact with infected pigs or eating uncooked, infected pig meat. Note that in some areas of the world this may include wild pig meat, e.g. wild boars.

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