Figure 2.

Occurrence of wild boar and outdoor pigs, and location of selected pig farms. Map of Switzerland showing communes with wild boar occurrence (grey areas) and outdoor piggeries (dots). Black dots: farms selected to study risk factors for contacts between wild boar and outdoor pigs in 2009–2010; white dots: not selected farms.

Wu et al. BMC Veterinary Research 2012 8:116   doi:10.1186/1746-6148-8-116
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