Wibaux-Charlois M, Yelnik A, Ibrahima H, Same-Ekobo A, Ripert C
Bull Soc Pathol Exot Filiales. 1982 Jan-Feb;75(1):72-93.
While inventoring the local malacological fauna and evaluating the density of species acting as intermediate hosts of human schistosomes it has been shown that Bulinus truncatus is predominant in the study area. Bulinus globosus is scarcely encountered. Biomphalaria pfeifferi is only found in the Mayo Guerleo, in irrigation canals and draining ditches. But B. globosus and B. pfeifferi have not yet invaded the recent aquatic network and are not found in the lake nor in the newly created irrigation systems. Snails shedding cercariae of S. haematobium and S. mansoni have been collected in the area. Bulinus forskalii is found in all types of permanent of temporary waterbodies but S. intercalatum has not yet been reported from North-Cameroon. Lymnaea natalensis, the intermediate host of Fasciola gigantica, is found in the lake and in the canals, in the Mayo Guerleo and in the Toupasko pool. The rice field does not form by itself a favorable environment for snails to develop in it. Spots where transmission occurare more often in the area the secondary of tertiary irrigation canals and the brains. The ditches obstructed by plants are the places where the snails are developing best. Bulinus spp. are found in large numbers in the lowest parts of the aquatic network and they accumulate there to survive drought conditions in the mud. The recently built irrigation systems are not massively invaded by the snails yet and the prevalence of bilharziasis in the area correspond to the distribution of the intermediate hosts of schistosomes and to the density of the snails populations.
在对当地贝类动物群进行清查并评估作为人类血吸虫中间宿主的物种密度时，发现截形小泡螺在研究区域占主导地位。球形小泡螺很少见。费氏双脐螺仅在马约-盖尔莱奥的灌溉渠道和排水渠中发现。但球形小泡螺和费氏双脐螺尚未侵入最近形成的水系，在湖泊和新创建的灌溉系统中均未发现。该地区已采集到排放埃及血吸虫和曼氏血吸虫尾蚴的螺类。福氏小泡螺在各类永久性或临时性水体中均有发现，但喀麦隆北部尚未报告间插血吸虫。巨大片形吸虫的中间宿主纳塔尔椎实螺在湖泊、渠道、马约-盖尔莱奥和图帕斯科池塘中均有发现。稻田本身并非螺类生长的适宜环境。该地区传播发生的地点更多在二级或三级灌溉渠道及水塘附近。被植物阻塞的沟渠是螺类生长最好的地方。小泡螺属大量存在于水系的最低区域，它们聚集在那里以在泥中度过干旱期。最近修建的灌溉系统尚未被螺类大量侵入，该地区血吸虫病的流行情况与血吸虫中间宿主的分布及螺类种群密度相符。
