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FERAL wild boar (Sus scrofa) and their semi-domestic relatives, feral pigs (Sus scrofa domestica),are distributed throughout many countries on all continents except Antarctica. These populations have recently expanded, particularly in the USA (USDA 2005) and Europe (Sáez-Royuela and Tellería 1986) due to the development of a commercial hunting industry (Acevedo and others 2006). As this trend continues, there is a growing concern regarding the ability of wild pig populations to serve as reservoirs of pathogens for domestic pigs. Therefore, as the risk of contact between feral and domestic pig populations increases, it becomes important to determine the health status of wild pigs.
The majority of publications in the literature on the prevalence of infectious agents in wild pigs have focused on regulatory diseases, that is, Aujeszky's disease and brucellosis; only a few papers have been published on the prevalence of production-limiting diseases in these animals. For example, in surveys conducted in Europe, the seroprevalence of porcine circovirus type 2 (PCV-2) in …