Prevalência e fatores de risco associados as infecções pelos Herpesvírus Bovino (BHV-1 e 5) e Diarréia Viral Bovina (BVD) nos rebanhos dos municípios de Santa Vitória do Palmar e Chuí

Abstract

This study was performed in order to estimate the prevalence of bovine herpesvirus type 1 (BHV-1), bovine herpesvirus type 5 (BHV-5) and bovine viral diarrhea (BVDV) infections and to determine the main risk factors related to the prevalence of these infections in cattle of Santa Vitória do Palmar and Chuí counties. In addition, we describe BHV-1 and BHV-5 isolation from infectious bovine rhinotracheitis (IBR) and pustular vulvovaginitis (IPV) outbreaks in Rio Grande, and encephalitis outbreaks in Santa Vitória do Palmar. Sera from all the animals were submitted to the serum neutralization test (SN) and an epidemiological questionnaire was filled out in each property to investigate variables that could be associated with these infections. The sera samples were collected in January and February of 2003, in 85 farms of Santa Vitória do Palmar and Chuí. The highest number of samples were from beef cattle, with or without clinical signs of BHV or BVDV infection. Of 1.734 serum samples examined, 540 (31,14%) were positive to BHV and 1.150 (66,32%) were positive to BVDV. Cattle seropositive to BHV were detected in 72 farms, representing 84,70% and, to BVDV, 70 farms, representing a percentage of 82,35%. The high percentages of positives demonstrate the expressive dissemination of this viruses in cattle of these counties.