Abstract
Serum samples collected from 358 wild boars (Sus scrofa) in breeding farms in São Paulo, southeast Brazil, from 1998 to 2001, were tested for antibodies against pseudorabies virus (PRV) by means of serum neutralization (SN) and enzyme-linked immunobsorbent assay (ELISA). Seropositive animals were detected in three of seven herds analyzed. Overall seroprevalence as assessed by SN was 30.7%, ranging from 25.2% to 100% for the herds that presented seropositive animals. Indirect ELISA detected lower seroprevalence (19.3%). Sensitivity and specificity of ELISA were equal to 57.3% and 97.6%, respectively. Agreement was equal to 85.2% (P<0.0001). These results showed that PRV infections occurred in farmed feral swine in southeast Brazil, and affect pseudorabies eradication program.
Highlights
Aujeszky’s disease, known as pseudorabies, is caused by an alphaherpesvirus and affects pigs at all ages
The objective of this paper is to report findings regarding pseudorabies virus antibodies in feral swine (Sus scrofa) from herds in cities of the State of Sao Paulo, southeast Brazil
The sensitivity and specificity of enzyme-linked immunobsorbent assay (ELISA) were equal to 57.3% and 97.6%, respectively; observed agreement was equal to 85.2% (P
Summary
Aujeszky’s disease, known as pseudorabies, is caused by an alphaherpesvirus and affects pigs at all ages. High mortality in naïve newborn piglets and abortion in pregnant sows cause economic losses for the swine industry. Pseudorabies virus (PRV) in natural hosts is able to establish latent infection, Antibodies against pseudorabies. Serological surveys for PRV antibodies and PRV isolation in domestic swine have been reported in many southern and southeastern states of Brazil (Hipolito et al, 1960; Romero et al, 1984; Kotait et al, 1986). The swine industry of countries that have the disease may be economically affected due to sanitary barriers imposed to international trade. As for Aujesky’s disease in wild boars (Sus scrofa), occurrence of clinical illness and prevalence of latent infections is unknown
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