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DOMESTIC pigs reared in free-range systems are exposed to continuous contact with wild boar population, which may act as reservoir of different pathogens responsible for important economic losses, such as porcine circovirus type 2 (PCV-2), porcine reproductive and respiratory syndrome virus (PRRSV), swine influenza virus (SIV), Aujeszky's disease virus (ADV) or Mycoplasma hyopneumoniae (Closa-Sebastià and others 2011, Boadella and others 2012, Fabisiak and others 2013, Foni and others 2013, Cano-Manuel and others 2014).
To date, the knowledge about the epidemiological situation of these diseases in pigs reared in free-range systems is very limited; despite this situation, they are related to important economic losses in the intensive pig industry (López-Soria and others 2010). Therefore, the objective of this study was to investigate the exposure of fattening pigs reared in free-range systems to the selected pathogens, as well as providing information on co-seropositivity against the studied primary pathogens involved in the porcine respiratory disease complex (PRDC) (Opriessnig and others 2011). The exposure to ADV was also evaluated in order to monitor the control and eradication programme (Council Directive 64/432/EEC).
Serum samples from 915 animals belonging to 61 herds (15 animals/herd) from the South-West of Spain were collected at two slaughterhouses during 2011–2012. All the pigs belonged to the Iberian breed …
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