Wystepowanie mieszanych zakazen BLV, BHV-1 i BVD-MD w stadach bydla mlecznego

The aim of the study was to assess the frequency of infectious BLV, BHV-1 and BVD-MD in cattle and estimate the degree of interaction between those viruses. The investigations were carried out in 3 herds of calves from identical industrial sheds. Antibodies against BLV were found in 51.6%, against BHV-1 in 39.9%, and an antibody against BVD-MD in 32.6%. The study showed a simple correlation between prevalence of antibodies against BLV and BHV-1 which means that as the percentage of infected animals with BLV increased, so did percentage of animals infected with BHV-1. The results suggest the possible coexistence of BLV and BHV-1 infection in cattle.