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Bezerros foram imunizados com duas vacinas contra o herpesvírus bovino tipo 1 (BHV-1; vacina A, n=28; B, n=28) ou com uma vacina contendo antígenos do BHV-1 e BHV-5 (n=32) e a atividade neutralizante sérica antiBHV-1 e BHV-5 foi testada após três doses vacinais. Todos os animais (n=88) produziram anticorpos com atividade neutralizante antiBHV-1 (títulos médios geométricos [GMT] de 13,1; 14,8 e 34,3 para as vacinas A, B e C, respectivamente) e 82 animais (93,2%) desenvolveram atividade neutralizante antiBHV-5 (GMTs: 10,6; 11,5 e 29,8, respectivamente). Nos três grupos vacinais, os títulos médios antiBHV-1 não diferiram dos títulos antiBHV-5. No entanto, comparando-se os títulos médios entre as vacinas, os títulos neutralizantes para o BHV-1 e BHV-5 foram superiores nos animais do grupo C (p<0,01 ). Esse grupo também apresentou a maior proporção de reagentes ao BHV-5 (96,9%; contra 85,7% da vacina A e 92,9% da vacina B). Esses resultados demonstram que a vacina C induziu títulos neutralizantes superiores contra os dois vírus e que anticorpos induzidos por antígenos do BHV-1 (vacinas A e B) possuem atividade neutralizante relevante também contra o BHV-5. Calves were immunized with two vaccines against bovine herspevirus type 1 (BHV-1; vaccine A, n=28; B, n=28) or with a vaccine containing BHV-1 and BHV-5 antigens (vaccine C, n=32) and the serum neutralizing activity against BHV-1 and BHV-5 was measured after three vaccine administrations. Neutralizing activity to BHV-1 was detected in sera of 100% (n=88) of the animals (geometric mean titers [GMT] of 13.1; 14.8 and 34.3 for vaccines A, B and C, respectively) whereas 82 sera (93.2%) reacted to BHV-5 (GMTs: 10.6; 11.5 and 29.8). In all three groups, the mean BHV-1 titers did not differ from BHV-5 titers. However, comparison among the vaccines demonstrated that the mean titers to BHV-1 and BHV-5 were higher in animals receiving vaccine C (p<0.01). This vaccine also induced a higher proportion of reagents to BHV-5 (96.9%; against 85.7% for vaccine A and 92.9% for vaccine B). These results demonstrate that vaccine C induced higher neutralizing antibody titers against both viruses; and that antibodies induced by BHV-1 antigens (vaccines A and B) cross-reacted and displayed relevant neutralizing activity against BHV-5

Atividade neutralizante anti-herpesvírus bovino tipos 1 (BHV-1) e 5 (BHV-5) no soro de bovinos imunizados com vacinas contra o BHV-1