Epidemiological situation of vesicular stomatitis virus infection in cattle in the state of Paraíba, semiarid region of Brazil

Publication date: 15 November 2018Source: Preventive Veterinary Medicine, Volume 160Author(s): Camila S. Bezerra, Juliana F. Cargnelutti, Jéssica T. Sauthier, Rudi Weiblen, Eduardo F. Flores, Clebert J. Alves, Inácio J. Clementino, Carolina S.A.B. Santos, Sérgio S. AzevedoAbstractThe aim of this survey was to estimate the apparent herd-level and animal-level prevalences, as well as to identify risk factors and spatial clustering of vesicular stomatitis virus (VSV) positive herds in the state of Paraíba, semiarid of Brazil. The state was divided into three sampling strata: Sertão, Borborema and Zona da Mata/Agreste. For each sampling stratum, herd-level and animal-level prevalences were estimated by a two-stage sampling survey. First, a pre-established number of herds (primary sampling units) were randomly selected; second, within each herd, a pre-established number of cows aged ≥ 24 months were systematically selected (secondary sampling units). In total, 2279 animals were sampled from 468 herds. Serum samples were submitted to virus neutralization (VN) test for detection of antibodies to VSV using three viral strains: VSIV-3 2013SaoBento/Paraiba E, strain Indiana (VSIV-1) and VSNJV. A herd was considered positive for VSV if it included at least one positive animal in herds of up to 10 females, two positive animals in herds of 11–99 females, and three positive in herds with more than 99 females. The spatial clustering was assessed using the Cuzick–Edwards’ k-near...
Source: Preventive Veterinary Medicine - Category: Veterinary Research Source Type: research