USE OF A COMBINED VACCINE CONTAINING FARM-SPECIFIC BACTERIUM STRAINS AND PARAINFLUENZA-3 VIRUS FOR THE PREVENTION OF RESPIRATORY-DISEASES OF CATTLE

Based on the results of preliminary bacteriological and virological st udies, farm-specific combined vaccines were produced for two cattle br eeding farms K. and J. Both vaccines contained partially dissociated, inactivated Pasteurella haemolytica Al and P. multocida A type bacteri a and parainfluenza-3 (PI-3) virus adsorbed to aluminiumphosphate gel. In farm K. 506, while in farm J. 315 calves were vaccinated subcutane ously twice with 5 ml of vaccine at the age of 4 to 6 weeks and two we eks later. Antibody levels against the two bacterium strains increased by 2 to 3, while that against PI-3 virus by 4 to 6 1092 values (Table s 1 and 2). Incidence of respiratory diseases, calf death and expenses of medicaments decreased as a result of vaccinations (Tables 3 and 4) .