Histopathologic lesion of Mannheimia haemolytica pneumonia in calves
2008
Jean, Y.H. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea), E-mail: jean@nvrqs.go.kr | Roh, I.S. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Lee, K.H. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Lee, K.W. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Lee, H.S. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea)
Four 5 month old calves were died after showing respiratory distress after long-distance transportation at winter season. They were diagnosed as fibrinous lobar pneumonia caused by Mannheimia (M.) haemolytica. Grossly, lungs were attached onto the pleura by fibrin, with a rich yellowish fluid in thorax. The cut surface of the lung was showed marbled pattern of the reddish or greyish consolidation and widened interlobular septa by fibrin depositional. Histopathologically, parenchymal necrosis was delineated by a band of the degenerated inflammatory cells, and distended interlobular septa with serofibrinous exudates and vascular thrombosis with alveolar capillaries degeneration and abundant serofibrinous exudates in alveoli. M. hemolytica were isolated from all calves, and bovine viral diarrhea virus and parainfluenza type 3 virus in one calf were detected by RT-PCR. Thus, it was concluded that this case was diagnosed as pneumonic mannheimiosis suggested by complex infection with viruses after long-distance transportation and coldness.
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