Duarte E R, Resende J C, Rosa C A, Hamdan J S
Department of Microbiology, Biological Science Institute, Federal University of Minas Gerais, Belo Horizonte, Brazil.
J Vet Med B Infect Dis Vet Public Health. 2001 Oct;48(8):631-5. doi: 10.1046/j.1439-0450.2001.00474.x.
Infestations by rhabditiform nematodes and acarids of the genus Raillietia are considered the primary causes of external otitis in cattle in tropical regions. Recently, yeasts of the genus Malassezia have been associated with a relatively high percentage of otitis cases, but the occurrence of other yeasts and mycelial fungi has not yet been reported in the literature. This work studied the presence of fungi in the ear canal of 45 cattle with external parasitic otitis. The results were positive for yeasts of the genus Malassezia in 31 (68.9%) of the 45 cultures in Mycosel medium supplemented with olive oil. The 45 cultures in Sabouraud dextrose medium revealed the growth of seven (15.5%) yeasts of the genus Candida, five (11.1%) Rhodotorula mucilaginosa, two (4.4%) fungi of the genus Aspergillus and eight 'Micelia sterilia'. Future studies may confirm and elucidate the importance of these agents in the aetiology of bovine otitis.
热带地区牛的外耳炎主要病因被认为是类圆线虫和赖利绦虫属螨类的寄生。最近，马拉色菌属酵母菌与较高比例的耳炎病例有关，但文献中尚未报道其他酵母菌和丝状真菌的出现情况。本研究调查了45例患有外寄生虫性耳炎的牛耳道内真菌的存在情况。在添加橄榄油的Mycosel培养基中，45份培养物中有31份（68.9%）马拉色菌属酵母菌检测呈阳性。在沙氏葡萄糖培养基中的45份培养物显示，有7份（15.5%）念珠菌属酵母菌、5份（11.1%）粘红酵母、2份（4.4%）曲霉属真菌和8份“无菌菌丝体”生长。未来的研究可能会证实并阐明这些病原体在牛耳炎病因学中的重要性。
