EN
The purpose of the studies was to assess the spread of BHV-1 infection in dairy cows. Clinical, virological and serological examinations were carried out in two stages within four years. Numerous clinical and asymptomatic cases of pustular vulvovaginitis were found in the herds under study. Serologic results showed that all the herds were infected (4.9 - 56.6%). The findings revealed a higher dynamics of infection spread in herds with low numbers of infected animals than in those with a high percentage of cows having specific antibodies against BHV-1. The results indicated that most cows aged 3-5 years had SN antibodies against BHV-1.