Lung lesions in swine. IV. Bacteriological and pathological diagnosis of porcine enzootic pneumonia in Minas Gerais State, Brazil

Nogueira, R.H.G.; Rezende, M.; Reis, R.; Nascimento, E.F. do; Chquiloff, M.A. de G.

Arquivos da Escola de Veterinaria da Universidade Federal de Minas Gerais 32(2): 143-149


Accession: 000923796

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A total of 840 swine lungs were examined in Brazilian abattoirs, and of these, 143 were selected for further study because of lesions suggestive of porcine enzootic pneumonia. Of the 143, 31 were positive for Mycoplasma hyopneumoniae, but the organism was recovered in pure culture from only two. The remaining isolates were associated with Mycoplasma hyorhinis (13 animals), sometimes combined with other unidentified bacteria (16 animals). The gross lesions were sharply delineated from the normal tissue and were generally confined to the apical and cardiac lobes. Consolidated areas were dark red to grey. Histological studies revealed perivascular and peribronchiolar infiltrates of lymphocytes, increased cellularity in the alveolar septa, while the alveoli contained macrophages, lymphocytes, and desquamated epithelium. In chronic cases there was peribronchial fibrosis. Occasionally neutrophils were present in the alveolar exudate and were considered to be the result of secondary pneumonia.