BVD CONSULT

Bulk milk testing for antibody seroprevalences to BVDV and BHV-1 in a rural region of Peru

aDepartment of Veterinary Microbiology, Section of Virology SLU, Biomedical Centre, Box 585, S-751 23, Uppsala, Sweden bLaboratorio de Virología, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Apartado 5137, Lima 3, Peru cNational Veterinary Institute, Uppsala, Sweden

Abstract

Bulk milk from 60 herds of dairy cattle in a rural region in the central highlands of Peru was tested for antibodies to bovine viral-diarrhoea  virus (BVDV) and  bovine  herpesvirus type 1 (BHV-1). None of the herds had been vaccinated against BVDV or BHV-1. Commercially available indirect ELISA-kits were used for antibody detection. True prevalences of BVDV and BHV-1 antibody-positive herds were 96 and 51%, respectively. A relatively low proportion of strongly positive herds suggests, however, a low prevalence of active BVDV infection. BVDV optical densities (ODs) in bulk milk increased with herd size—indicating a higher within-herd prevalence in the larger herds (probably, in part a consequence of a higher rate of animal movement into these herds). For BHV-1, this pattern was not found; a relatively high proportion of the herds was free from BHV-1 infection in each size category. This could indicate a low rate of reactivation of latent BHV-1 infection.

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This article was published in Preventive Veterinary Medicine, 56, K. Ståhla, H. Riverab, I. Vågsholmc and J. Moreno-Lópeza, Bulk milk testing for antibody seroprevalences to BVDV and BHV-1 in a rural region of Peru, 193-202, Copyright Elsevier 2002.