_________________________________________________________________________________________________________________Resumo -Vaquejada é um esporte eqüestre popular no nordeste brasileiro, que promove encontros frequentes, onde há uma grande concentração de animais, propiciando a exposição à patógenos. Na literatura, não existem relatos da presença dos herpesvírus equídeo Serological evidences of EHV-1 / EHV-4 in vaquejada horses from Ceará state, BrazilAbstract: Vaquejada is a popular equestrian sport in Northeastern Brazil, which promotes frequent tournaments, where many animals are brought together, leading to Alencar-Araripe et al., Revista Brasileira de Higiene e Sanidade Animal (v.8, n.2) p. 203 -217, abr -jun (2014) 204 exposure to pathogens. In the literature, there are no reports of the presence of equid herpesvirus (EHV-1/EHAV-4) in the State of Ceará. This study aimed at determining antiequid herpesvirus (EHV-1/EHV-4) antibody titer of non-vaccinated horses from the state of Ceará. Sixty-eight clinically healthy vaquejada horses were evaluated. Blood samples were collected for hematological, biochemical and serological evaluation. Anti-EHV-1 / EHV-4 antibody titers were determined through serum neutralization technique. Out of the 68 assessed animals, 28 (41.2%) were seropositive for EHV-1 and/or EHV-4, with a mean geometric titer of 4,76, while the remaining 40 (58.8%) animals were negative for the assay.No significant alterations in the hematological and biochemical parameters were found among seropositive and seronegative animals. The average age of the tested animals was 7 years. A mild positive correlation and a mild influence was observed between age and antibody titer. This is the first report of circulating equid herpesvirus in Ceará. Further studies must be performed to obtain knowledge on promoting the welfare of horses involved in the practice of vaquejada.
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