Gouda Hanaa A, Moharram Ahmad M
Department of Zoology, Faculty of Science, Assiut University, Assiut 71516, Egypt.
J Invertebr Pathol. 2009 Apr;101(1):23-8. doi: 10.1016/j.jip.2009.03.001. Epub 2009 Mar 12.
During the period from December 2006 to March 2007, about 1000 freshwater leeches, Salifa delicata, were collected from Al-sont canal, adjacent to Assiut city, Egypt. In the laboratory, 96% of Salifa delicata showed signs of oomycotal infection (cotton-wool like appearance radiating out in whorled pattern) and died within 3 days. Direct microscopy and culture proved Saprolegnia hypogyna to be the pathogen. Histopathological studies showed necrotic lesions, destruction of cuticle, epidermis, dermis, muscle layers, botryoidal tissue and even the gut with the oomycete hyphae penetrating the damaged tissues. To the best of the authors' knowledge, this represents the first record of a novel association between the leech, Salifa delicata, and the oomycete, Saprolegnia hypogyna, but the second report on the histopathology of saprolegniasis within leeches.
2006年12月至2007年3月期间，从埃及阿斯尤特市附近的艾尔松特运河采集了约1000条淡水水蛭——精致萨利水蛭。在实验室中，96%的精致萨利水蛭出现卵菌感染迹象（呈螺旋状向外辐射的棉絮状外观），并在3天内死亡。直接显微镜检查和培养证明低枝水霉是病原体。组织病理学研究显示存在坏死病变，角质层、表皮、真皮、肌肉层、葡萄状组织甚至肠道遭到破坏，卵菌菌丝穿透受损组织。据作者所知，这是水蛭精致萨利水蛭与卵菌低枝水霉之间新关联的首次记录，但却是关于水蛭中水霉病组织病理学的第二篇报道。
