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

• Published in: Preventive veterinary medicine 2006-10, Vol.76 (3), p.290-301
• Main Authors: Thompson, James Alan, de Miranda Henriques Leite, Ricardo, Gonçalves, Vítor Salvador Picão, Leite, Rômulo Cerqueira, Bandeira, Dimas A., Herrmann, Geder Paulo, Moreira, Élvio Carlos, Prado, Paulo Emílio Franco, Lobato, Zélia Inês Portela, de Brito, Cristiane Pinheiro Toscano, Lage, Andrey Pereira
• Format: Article
• Language: English
• Subjects: Age Factors; animal age; Animals; Antibodies, Bacterial - blood; Antibodies, Viral - blood; BoHV-1; Bovine herpesvirus 1; Bovine viral diarrhea virus; Bovine Virus Diarrhea-Mucosal Disease - epidemiology; Bovine Virus Diarrhea-Mucosal Disease - transmission; Brazil - epidemiology; BVDV; Cattle; cattle diseases; Cattle Diseases - epidemiology; Cattle Diseases - transmission; Cluster Analysis; Diarrhea Viruses, Bovine Viral - immunology; disease prevalence; epidemiology; Hardjo; Herpesvirus 1, Bovine - immunology; Hierarchical variance; Infectious Bovine Rhinotracheitis - epidemiology; Infectious Bovine Rhinotracheitis - transmission; Leptospira interrogans - immunology; Leptospira interrogans serovar hardjo; Leptospirosis; Leptospirosis - epidemiology; Leptospirosis - transmission; Leptospirosis - veterinary; Paraíba, Brazil; risk factors; Seroepidemiologic Studies; seroprevalence; spatial distribution; viral diseases of animals and humans
• ISSN: 0167-5877; 1873-1716
• DOI: 10.1016/j.prevetmed.2006.05.010

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.