SEROPREVALENCE OF BVDV, BHV-1, PI-3 AND BRSV IN 12 DAIRY FARMS IN THEPROVINCE OF VALDIVIA

The relevance that viral agents have in the presentation of respirator y diseases in known world-wide. Nevertheless, in our country there is little information and it is generally related to only one agent. This communication reports the results of a serological survey for Bovine Viral Diarrhoea Virus (BVDV), Bovine Herpes Virus-1 (BHV-1), Parainflu enza-3 Virus (PI-3) and Bovine Respiratory Syncitial Virus (BRSV). 286 4 sera from 12 dairy farms were analyzed for antibodies to PI-3 virus by haemagglutination inhibition, to BVDV, BRSV and BHV-1 by virus neut ralization. The herd seroprevalence was 100% for BVDV, PI-3 and BRSV a nd 91.7% for BHV-1, and the individual seroprevalence 50.9%, 41.0%, 97 .1% and 51.8% for BVDV, BHV-1, PI-3 and BRSV respectively. These resul ts would confirm, in the cattle of the herds analized, the possible re levance of viral agents in the genesis of respiratory problems. For th is reason, measures for their control and future erradication should b e implemented.