Histopathologic Lesion of Mannheimia haemolytica pneumonia in calves

송아지에서 발생한 Mannheimia haemolytica 폐렴의 병리조직학적 소견

  • Jean, Young Hwa (National Veterinary Research and Quarantine Service) ;
  • Roh, In Soon (National Veterinary Research and Quarantine Service) ;
  • Lee, Kyung Hyun (National Veterinary Research and Quarantine Service) ;
  • Lee, Kyung Woo (National Veterinary Research and Quarantine Service) ;
  • Lee, Hee Soo (National Veterinary Research and Quarantine Service)
  • Accepted : 2008.06.23
  • Published : 2008.12.01


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 deposition. 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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