EN
Paratuberculosis (JD) is a chronic contagious inflammation of the intestines of ruminants that causes considerable economic losses. The diagnosis of MAP infections could be the basis for the development of a JD eradication programme. The aim of the study was to determine the seroprevalence of JD in cattle herds in two districts of north-eastern Poland. Serum samples taken from 1,203 cattle herds were subjected to a commercial ELISA test (ELISA paratuberculosis screening test®, Institut Pourquier). Animals with positive reactions to paratuberculosis were detected in 76 herds. Considerable differences between the two districts were observed in the results obtained: in District I the seroprevalence of JD amounted to 3.2%, whereas in District II it was 0.8%. The differences in seroprevalence were related to the size of the herds.