Postweaning multisystemic wasting syndrome in farmed wild boars (Sus scrofa) in Rio Grande do Sul

Abstract

This report concerns an outbreak of postweaning multisystemic wasting syndrome in wild boars from commercial herds in Rio Grande do Sul, Brazil. The main clinical signs were progressive wasting, respiratory distress, diarrhea, and ocular discharges. Enhanced lymph nodes and spleens, ascites, hydrothorax, and non collapsed lungs were the principal gross lesions. Varying degrees of lymphohistiocytic infiltrates in lymph nodes, spleen, and intestines were the most significant microscopic changes. Although a total of 26 animals had showed clinical and pathological findings consistent with the disease, only in 11 of them it was possible to confirm a PMWS diagnosis through the association of specific lesions in lymphoid tissues with the presence of the viral antigen detected by immunohistochemistry. These findings were similar to those reported in the swine disease.

Enteritis associated with Lawsonia intracellularis and porcine circovirus type 2 infection in wild boars in Southern Brazil

“…Additionally, some lesions were similar to that reported in an outbreak of PCV2 infection in wild boars (CORRÊA et al, 2006).…”

Prevalence of Infection and Genetic Diversity of Porcine Circovirus Type 2 (Pcv2) in Wild Boar (Sus Scrofa) in Poland

“…Cases of PMWS have been identified in several countries and included farmed wild boars in North America (Ellis et al, 2003) and Brazil (Correa et al, 2006) and free-living animals in Croatia and Greece (Lipej et al, 2007;Sofia et al, 2008).…”

“…In wild boar populations prevalence of antibody to PCV2 was 50% in Spain (Vicente et al, 2004;Ruiz-Fons et al, 2006) and 43% in the Czech Republic (Sedlak et al, 2008) and PMWS in wild boars has been described in many countries including the USA (Ellis et al, 2003), Brazil (Correa et al, 2006), Germany (Schulze et al, 2004), Croatia (Lipej et al, 2007), Greece (Sofia et al, 2008), and Italy (Petrini et al, 2009). We estimated the prevalence of PCV2 infection in Polish wild boars based on real-time PCR and evaluated phylogenetic relationship of PCV2 from wild boars and domestic pigs in Poland.…”

Porcine circovirus type 2 (PCV2) antigen localisation and post-weaning multisystemic wasting syndrome (PMWS) in free-ranging wild boar (Sus scrofa ssp scrofa) in Italy

“…A delay in developing PMWS signs and lesions was also reported by Schulze et al (2004) and Vicente et al (2004), recording the disease in wild boar aged more than 40 weeks. This may be due to the later weaning age of wild boar in nature (Correa et al 2006) or to the absence of intensive management procedures such as vaccinations and other stressors.…”