Grillet M E, Botto C, Basañez M G, Barrera R
Instituto de Zoología Tropical, Facultad de Ciencias, Universidad Central de Venezuela, Caracas.
Ann Trop Med Parasitol. 1994 Feb;88(1):65-75. doi: 10.1080/00034983.1994.11812837.
Experimental infections of Simulium metallicum s.l. with Onchocerca volvulus were carried out in two onchocerciasis foci, Altamira and Trincheras, in northern Venezuela, to determine vector competence. Wild-caught flies, fed on infected volunteers, were maintained in the laboratory for 13-15 days at 27 degrees C. Parasite development was complete but asynchronous and retarded. No differences in the vector competence of the two populations of S. metallicum s.l. were found. However, a less efficient development of the parasite occurred during the dry season at both localities. The distribution of the parasite within the vector was aggregated and also displayed seasonal variation. The seasonal susceptibility may be a consequence of a density-dependence regulation mechanism of the parasite within the vector. These results indicate a relatively low vector competence for S. metallicum s.l. in northern Venezuela.
在委内瑞拉北部的两个盘尾丝虫病疫源地阿尔塔米拉和特里切拉斯，对金属蚋复合种进行了感染旋盘尾丝虫的实验，以确定其媒介能力。以感染志愿者血液为食的野生捕获苍蝇，在实验室中于27摄氏度下饲养13 - 15天。寄生虫发育完全，但不同步且延迟。未发现金属蚋复合种的两个种群在媒介能力上存在差异。然而，在两个地点的旱季，寄生虫的发育效率较低。寄生虫在媒介体内的分布呈聚集性，且也表现出季节性变化。季节性易感性可能是寄生虫在媒介体内密度依赖性调节机制的结果。这些结果表明委内瑞拉北部的金属蚋复合种媒介能力相对较低。
