aDepartment of Large Animal Clinical Science, College of Veterinary Medicine, Texas A&M University, College Station, TX 77845, USA bLaboratório de Bacteriologia Aplicada, Núcleo de Pesquisa em Saúde Animal, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Caixa Postal 567, 30123-970 Belo Horizonte, MG, Brazil cEmpresa Estadual de Pesquisa Agropecuária da Paraíba S.A. (EMEPA-PB), João Pessoa, PB, Brazil dFaculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Campus Darcy Ribeiro, ICC Sul, C.P. 4508, 70.910-970 Brasília, DF, Brazil eDepartamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria, RS, Brazi
We estimated spatial hierarchal variances and age-group covariances for seroprevalence to Leptospira interrogans serovar hardjo (LeptoH), bovine viral-diarrhea virus (BVDV) and bovine herpesvirus type 1 (BoHV-1) among 2343 cattle from 72 properties sampled in the State of Paraíba, Brazil in 2000. From each property, eight animals in each of the four age categories were evaluated. The age categories studied were: pre-weaned (0–6 months), young (7–18 months), replacement (19–30 months) and mature (>30 months). Overall seroprevalence to LeptoH was 16.0% and showed clustering at all levels of the spatial hierarchy and had a high posterior probability of being negatively correlated between replacement and mature groups within herds. Seroprevalence to BoHV-1 was 46.6% and demonstrated very little clustering among levels of the spatial hierarchy and was positively correlated between young and replacement groups within herds. Seroprevalence to BVD was 22.2% and was strongly clustered within herds and was positively correlated between young and replacement age groups within herds.
This article was published in Preventive Veterinary Medicine, 76, James Alan Thompsona, Ricardo de Miranda Henriques Leiteb,c, Vítor Salvador Picão Gonçalvesd, Rômulo Cerqueira Leiteb, Dimas A. Bandeirac, Geder Paulo Herrmanne, Élvio Carlos Moreirab, Paulo Emílio Franco Pradob, Zélia Inês Portela Lobatob, Cristiane Pinheiro Toscano de Britob and Andrey Pereira Lageb, Spatial hierarchical variances and age covariances for seroprevalence to Leptospira interrogans serovar hardjo, BoHV-1 and BVDV for cattle in the State of Paraíba, Brazil, 290-301, Copyright Elsevier 2006.