Serological study of Maedi-Visna by agar gel immunodifusion method in sheep in Juazeiro, Bahia, Brazil

Abstract

Bahia state has the second largest sheep population in Brazil, and among the diseases that affect these animals, it is included Maedi-Visna virus which needs special care due to the considerable increase in the risk on disseminating this Lentivirus, by the introduction of exotic breeds of animals in Brazil. Thus, the objective of this study was to verify the prevalence of antibodies to Maedi-Visna virus in Juazeiro city – Bahia, which has one of the greatest numbers of sheep in the country. Agar Gel Immunodifusion test was used to study 200 serum samples from 13 farms. The predominant exploration system in the region is the extensive one, and the presence of native and crossbred animals for the production of meat and skin, characterized by low productivity and low technical level. The prevalence of antibodies was 0.5%, which explains the necessity of broad serological studies, as well as implantation of prevention and control techniques of this disease in the State, due to the use of exotic breeds for genetic improvement of native animals.