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KMID : 1023520150380030195
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Korean Journal of Veterinary Service
2015 Volume.38 No. 3 p.195 ~ p.198
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Mannheimiosis case in Hanwoo caused by heat stress
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Lee Jeong-Won
Shon Ku-Rye
Jeong Han-Sol
Ko Won-Seok
Lim Chae-Woong
Kim Bum-Seok
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Abstract
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Mannheimia haemolytica is an opportunistic bacterium that is widely recognized among the bovine respiratory disease (BRD) complex in cattle. Five Hanwoo with a history of fever, anorexia and dyspnea were died within 2 days in a the middle of summer. Four cattle were pregnant. The cattle house were located in mountainous area but the window for air ventilation was open only one side. In addition, the fecal material for fermentation was located indoor. Air ceiling fan did not work. The indoor temperature was 40oC. After working on air fan, the indoor temperature was still 36oC. On necropsy, there was fibrinous pleuritis with a rich yellowish pleural fluids in the thorax. The cross-section of the lung showed lobar fibrinonecrotic pneumonia with expanded interlobular septa by edema and fibrin. Microscopically, parenchymal necrosis with dense layer of inflammatory cells were observed surrounding interlobular septum. Fibrin and inflammatory cells were filled in the alveoli. Bacteriological cultures of pulmonary tissue showed growth of M. haemolytica. This pneumonia case in Hanwoo suggests that environmental stressors such as high temperature, insufficient air ventilation, and pregnancy be the cause of mannheimoisis. Control of environmental stressor, such as temperature indoor is necessary to prevent BRD caused by M. haemolytica.
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KEYWORD
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Hanwoo, Mannheimia haemolytica, Fibrinonecrotic pneumonia, Environmental stressors
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