Agents of pneumonia in slaughtered pigs in southern Brazil

ABSTRACT: A high prevalence of pneumonic lesions has been reported to affect slaughtered pigs in southern Brazil. In order identify which microorganisms have causing those lesions, 30 pig lungs presenting gross were collected from five different slaughterhouses, totaling 150 lungs. Samples for bacterial isolation, molecular, histopathologic and immunohistochemistry (IHC) evaluation taken each lung. The lesion scoring ranged 1.53 2.83. most frequent histopathological found was the concomitant Influenza virus (IAV) Mycoplasma hyopneumoniae infection, corresponding 55.3% (83/150), Pasteurella multocida type isolated 54.2% (45/83) these cases. 102 samples (68%), there suggestion involvement more than one infectious agent. M. agent associated with being present 92.1% (94/102) coinfections, followed by IAV 89.2% (91/102). Besides observed also six without another pathogenic microorganism detected. total 46 acute subacute suspected examination assessed IHC real time RT-PCR IAV. 35% (16/46) them positive 13% (6/46) RT-PCR. Regarding hyopneumoniae, 79.3% (119/150) qPCR 84.9% (101/119) presented examination. results this study suggest importance respiratory diseases finishing pigs, even though is frequently nursery phase. addition, our emphasize lung coinfections pigs.