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Year 2018 - Volume 38, Number 4
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Serological investigation of antibodies against respiratory viruses in calves from Brazilian family farming and their relation to clinical signs of bovine respiratory disease, 38(4):642-648
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ABSTRACT.- Gaeta N.C., Ribeiro B.L.M., Alemán M.A.R., Yoshihara E., Marques E.C., Hellmeister A.N., Pituco E.M. & Gregory L. 2018. Serological investigation of antibodies against respiratory viruses in calves from Brazilian family farming and their relation to clinical signs of bovine respiratory disease. [Investigação sorológica de anticorpos contra vírus respiratórios em bezerros de propriedades familiares brasileiras e sua relação com os sinais clínicos da doença respiratória dos bovinos.] Pesquisa Veterinária Brasileira 38(4):642-648. Departamento de Clínica Médica, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Avenida Prof. Dr. Orlando Marques de Paiva 87, Cidade Universitária, São Paulo, SP 05508 270, Brazil. E-mail: lgregory@usp.br
Bovine respiratory disease (BRD) is responsible for economic losses in cattle production. Viruses are categorized as primary etiological agents. The aims of this study were to evaluate the presence of antibodies against bovine viral diarrhea virus (BVDV), bovine herpes virus type 1 (BoHV-1), and bovine respiratory syncytial virus (BRSV) in healthy and BRD calves from family farming in relation to clinical signs of BRD. Hundred and forty-five calves were randomly selected and physical examination was performed. Only 123 animals were classified as healthy and BRD calves. Antibodies were evaluated by virus neutralization test. Person’s Chi-square test and Fisher’s exact test were performed as univariate analysis. Binary Logistic Regression was applied as multivariate analysis. Variables with P<0.10 were considered statistically significant. Variables with 0.15
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