Diaw O T, Vassiliades G, Seye M, Sarr Y
Service de Parasitologie, LNERV-ISRA, Dakar-Hann.
Bull Soc Pathol Exot. 1991;84(2):174-83.
A recent outbreak of intestinal schistosomiasis (1989) has been reported in Richard-Toll (Delta of Senegal River) with a global prevalence of 43%. A malacological survey has been carried in order to study, the density of Biomphalaria pfeifferi the intermediate hosts, their distribution and rate of infection, and to identify the transmission sites. Ten districts have been selected. The snails have been collected in the different water points of these localities which are the river, the Taouey marigot, the Taouey channel and the irrigation channels and drains of the CSS (Senegal Sugar Company). A total of 1,210 Biomphalaria have been collected in 45 sites with a variable density of 2 to 150 snails. The overall rate of infestation of snails is 44% but varies according to the districts (9 to 64%). The transmission is acting in all the districts mainly in the Taouey channel (28% of infested snails) the Taouey marigot (38% of infested snails) and particularly in the channels of CSS (47% of infested snails). The situation is alarming and requires urgent action be undertaken to decrease the prevalence and reduce the transmission.
近期（1989年）在理查德 - 托尔（塞内加尔河三角洲）报告了一起肠道血吸虫病疫情，总体患病率为43%。为研究中间宿主费氏扁卷螺的密度、分布及感染率，并确定传播地点，开展了一项软体动物学调查。选取了10个地区。在这些地区的不同水源点采集蜗牛，包括河流、陶埃马里戈特河、陶埃河以及塞内加尔糖业公司（CSS）的灌溉渠道和排水渠。在45个地点共采集到1210只费氏扁卷螺，蜗牛密度在2至150只不等。蜗牛的总体感染率为44%，但因地区而异（9%至64%）。传播在所有地区均有发生，主要集中在陶埃河（感染蜗牛占28%）、陶埃马里戈特河（感染蜗牛占38%），尤其是CSS的渠道（感染蜗牛占47%）。情况令人担忧，需要立即采取行动降低患病率并减少传播。
