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Nickoll, Ina; Striegl, Julia; Fux, Robert; Sutter, Gerd ORCID logoORCID: https://orcid.org/0000-0001-6143-082X; Ritzmann, Mathias and Eddicks, Matthias (2016): Porzine Circovirus Typ 2 (PCV2) – Infektionen in oberbayerischen Schweinemastbeständen mit routinemäßiger Impfung gegen PCV2 – Bedeutung für das Auftreten von Lungenveränderungen bei Schlachttierkörpern. In: Tierärztliche Umschau, Vol. 71, No. 10: pp. 360-370

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The present investigation examines the meaning of PCV2 infections for lung lesions at slaughter of routinely PCV2 vaccinated pigs from preselected fattening farms under consideration of other relevant pathogens. All of the farms had a known history of noticeable lung lesions at slaughter. In total 300 fattening pigs from 10 Upper Bavarian fattening farms were included in this study. Pigs were individually signed by ear tags. Blood samples were collected at placement (age of 10-12 weeks), in the midst of fattening (16-18 weeks) and at the end of fattening/before slaughtering (22 weeks). All serum samples were examined for the presence of PCV2 DNA and serologically tested for the presence of antibodies against PCV2, Actinobacillus pleuropneumoniae, Mycoplasma hyopneumoniae, swine influenza virus, porcine reproductive and respiratory syndrome virus and porcine circovirus type 2. Furthermore 20 % of all Actinobacillus pleuropneumoniae and swine influenza virus seropositive samples per farm were serotyped. At abattoir all lungs were checked for lung lesions by palpatory and visual examination. Additional tonsil and lung tissue was collected at abattoir for PRRSV RNA testing by PCR. Based on the laboratory diagnostics an infection status was assigned to each single pig as well as to each farm. By the means of logistic regression analysis it could be shown that PCV2 infections, together with other pathogens like PRRSV, STV, M. hyopneumoniae und APP, in fattening pigs can be significantly associated with the occurrence of pleurisy and the extent of pneumonic lesions at abattoir. Animal stocks with conspicuous lung lesions at slaughter should consider checking their PCV2 status to possibly reduce the frequency of pleurisy and extent of pneumonic lung lesions at slaughter by optimizing their PCV2 prophylaxis/prevention measures.

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