Park Jeonghwa, Friendship Robert M, Poljak Zvonimir, DeLay Josepha, Slavic Durda, Dewey Catherine E
Department of Population Medicine, Ontario Veterinary College, Guelph, Ontario (Park, Friendship, Poljak, Dewey), Animal Health Laboratory, University of Guelph, Guelph, Ontario (DeLay, Slavic).
Can Vet J. 2013 May;54(5):491-5.
Porcine ear necrosis was investigated in 23 conveniently chosen farms, consisting of 14 case farms and 9 control farms. Biopsies of lesions and oral swabs from pigs on 11 case farms were examined by histology and bacterial culture. All farms were visited for observations and a survey on management, housing, and the presence of other clinical signs or behavioral vices. Histological examination revealed that the lesions began on the surface and progressed to deeper layers, and that vascular damage did not appear to be the initiating cause. Spirochetes were only rarely observed in histological examination and were not cultured from biopsies and oral swabs. Staphylococcus aureus and Staphylococcus hyicus were cultured from 91% and 66% of samples, respectively. Ear biting and a humid environment were associated with ear necrosis. On some farms large numbers of pigs were affected and lesions were sometimes extensive. The condition appears to be an infectious disease beginning on the surface of the skin; contributing environmental and management factors are likely.
对23个方便选取的猪场的猪耳坏死情况进行了调查，其中包括14个病例猪场和9个对照猪场。对11个病例猪场的猪病变组织活检样本和口腔拭子进行了组织学检查和细菌培养。对所有猪场进行了走访观察，并就管理、猪舍情况以及其他临床症状或行为恶习的存在情况进行了调查。组织学检查显示，病变始于皮肤表面并向深层发展，血管损伤似乎不是起始原因。在组织学检查中仅偶尔观察到螺旋体，且未从活检样本和口腔拭子中培养出螺旋体。分别从91%和66%的样本中培养出金黄色葡萄球菌和猪葡萄球菌。咬耳和潮湿的环境与耳坏死有关。在一些猪场，大量猪只受到影响，病变有时很广泛。这种情况似乎是一种始于皮肤表面的传染病；环境和管理因素可能起到了促成作用。
