Infections of blackflies (Diptera : Simuliidae) with three types of zoonotic Onchocerca larvae in Oita, Japan
Infections of blackflies (Diptera : Simuliidae) with three types of zoonotic Onchocerca larvae in Oita, Japan
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日本大分黑蝇（双翅目：蚋科）感染三种人畜共患盘尾蚴幼虫
DOI：
10.2149/tmh1973.18.1
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
O. Bain
中科院分区：
文献类型：
--
作者：
H. Takaoka;O. Bain
在日本南部大分县发生人畜共患盘尾丝虫病的五个牛棚里，采集到了野生雌性黑蝇。在所捕获的8个种中，双齿拟单胞藻为优势种，其次为阿拉卡瓦拟单胞藻。自然感染丝虫幼虫的比例为10.5-20%，分别为10.5-20%和6%。仅有1只感染的阿拉卡瓦金龟子在胸腔内藏有两条三期幼虫，其余的胸腔内均有1-4条一、二期幼虫。从采集后存活6-9天的野蝇获得的第三期幼虫可分为三种类型：从双齿亚种、阿拉伯亚种和青海亚种中发现的I型幼虫可能是新的，体长较长(1,075-1,380 pm)，而从亚种和亚种中分别发现的II和III类幼虫分别与Gutturosa和O.lienalis难以区分。由于其嗜人和嗜食动物的特性，因此它是大分西郊人畜共患钉螺(无论是I型还是II型)的最有可能的媒介。
Wild female blackflies were collected at five cattle sheds in Oita, southern Japan, where a human zoonotic onchocerciasis had occurred. Among the eight Simulium species captured, S. bidentatum was predominant, followed by S. arakawae. Natural infections with filarial larvae were found in 10.5-20% of the parous S. bidentatum collected at three cattle sheds, and also in 6% of the parous S. arakawae captured at one cattle shed. Only one infected S. arakawae harbored two third-stage larvae in the thorax while the others had 1-4 either first-or second-stage larvae in the thorax. Third-stage larvae obtained from wild flies maintained alive for 6-9 days after being collected are distinguished into three types of Onchocerca : type I recovered from S. bidentatum, S. arakawae and S. aokii is probably new, having an elongated body length (1, 075-1, 380 pm), and types II and III, recovered from S. bidentatum and S. arakawae respectively, are each indistinguishable from O. gutturosa and O. lienalis. It is suggested that due to its anthropophily as well as zoophily S. bidentatum is the most probable vector of zoonotic Onchocerca (either type I or II) which may be acquired by humans in the western suburbs of Oita.