The presence of Aujeszky’s disease of swine (AD) on the OIE list of infectious diseases of particular importance is the basis for the activities of the National Veterinary Service aimed at its eradication. Namely, achieving freedom from this disease in swine in a country is the prerequisite for being able to export them to other countries. In relation to this, the objective of the present review was to present opinions concerning the risk of infection of domestic swine from the reservoir of Aujeszky’s disease virus (ADV) present in feral swine and wild boars. On the basis of serologic and virologic investigations performed in the USA in feral swine and in several European countries, including Poland, in wild boars, usually subclinical ADV-caused infections were demonstrated. However, in no case could a connection between these infections and AD in domestic swine be demonstrated. On the basis of these findings it was agreed that freedom of swine from AD in a country would be recognized internationally, if requirements of the OIE and EU are fulfilled concerning domestic swine. This means that existing reservoirs of ADV in feral swine and wild boars do not interfere with this status. It is, however, recommended to perform seasonal monitoring of feral swine and wild boars for ADV infection, for example during hunting seasons.
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