EN
The detailed analysis of evolution of Aujeszky’s disease (AD) in the Olsztyn voivodeship in 1987—1991 was performed. In 1987 this situation aggrevated. There were 12 outbreaks of AD, 6 in farms of pigs, 5 in cattle farms and 1 in a fur animal farm. Two main reasons of such situation were underlined, intensive and uncontrolled pig movement without their serological examinations and breeding of pigs and cattle in the same stable. To improve the epizootic situation in November 1987 the obligatory and strict pig movement control measures were introduced. They caused a considerable decrease of new outbreaks in next years. In 1990—1991 losses caused by AD in 2 dogs in individual farmers and in a dog and cat in owners living in towns and in 2 deers were noted.