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Abstract

Respiratory infections are common in feline population throughout the world. However systematic reports on the various disease conditions affecting the respiratory system of felines are scanty. A detailed pathological and microbiological investigation into a case of pyothorax observed in a 2 year old cat is reported herein. The carcass of a cat aged two years brought for post-mortem examination with the history of dyspnea formed the study material. Post mortem examination revealed gross lesions of fibrinopurulent pleurisy, cardiac hypertrophy, splenic congestion, metastatic suppurative hepatitis, nephrosis and congestion of brain. Histological examination of the representative tissue samples revealed fibrinonecrotic pleuritis, alveolar collapse, inflammatory cell infiltration and alveolar epithelialization within the lung parenchyma. Gram negative, coccobacillary organisms suggestive of the genus Pasteurella was isolated from the pleural cavity. The organism was identified as Pasteurella multocida based on biochemical characteristics, mice pathogenicity and PM-PCR. The antibiogram of the isolate revealed sensitivity to Ciprofloxacin, Chloramphenicol, Ceftriaxone, Amoxycillin and Co-trimoxazole and resistance to Gentamicin. This is the first report of isolation of P.multocida from a case of pyothorax in cat from India.