Ngonseu E, Greer G J, Mimpfoundi R
Projet Bilharziose, IMPM, Yaoundé, Cameroun.
Ann Soc Belg Med Trop. 1992 Dec;72(4):311-20.
The evolution of the population densities of Bulinus truncatus and Bulinus forskalii has been studied during 18 months in a number of sites of the Sudan-Sahelian zone of Cameroon, in relation to certain environmental factors. Only the altitude of the water in the sites has an influence on the density of the snails. The populations of B. truncatus present a greater proportion of young molluscs during the entire year, with the exception of the last months of the dry season. The population dynamics of B. forskalii varies depending on whether the environment is temporarily stagnant, temporarily running or stable. The proportions of B. truncatus and B. forskalii that emit cercariae of schistosomes are 1.2% and 0.8% respectively. Study of the adult worms obtained after infestation of the laboratory mammals show that B. truncatus emits cercariae of Schistosoma haematobium at the end of the dry season and at the beginning of the rainy season. We have not been able to identify precisely the cercariae emitted by B. forskalii, which raises the necessity of further systematic studies being carried out on the schistosomes of Cameroon.
在喀麦隆苏丹 - 萨赫勒地区的多个地点，研究了截形水泡螺和福氏水泡螺的种群密度在18个月内的变化情况，并分析了其与某些环境因素的关系。在这些地点，只有水体的海拔高度对蜗牛的密度有影响。截形水泡螺的种群在全年中，除了旱季的最后几个月外，幼体软体动物的比例都较高。福氏水泡螺的种群动态因环境是暂时停滞、暂时流动还是稳定而有所不同。截形水泡螺和福氏水泡螺排出血吸虫尾蚴的比例分别为1.2%和0.8%。对实验室哺乳动物感染后获得的成虫进行研究表明，截形水泡螺在旱季末期和雨季初期排出埃及血吸虫尾蚴。我们尚未能够准确鉴定福氏水泡螺排出的尾蚴，这就需要对喀麦隆的血吸虫进行进一步的系统研究。
