| invasion of the nile valley in egypt by a hybrid of biomphalaria glabrata and biomphalaria alexandrina, snail vectors of schistosoma mansoni. | two years (1996-1997) of systematic survey showed that a hybrid of biomphalaria glabrata and biomphalaria alexandrina has invaded the irrigation and drainage systems in the nile delta and the valley nor the of el-menya. however, the infestation of water courses by and the population density of this snail were variable in various localities. the infestation rate ranged between 7.1% in el-fayoum governorate and 52.6% in el-dakahliya governorate and the snail density from 2 snails/site to 69.7 snai ... | 1998 | 9707685 |
| spot light survey on fresh-water snails of medical importance in al fayoum governorate, egypt. | in a survey carried out during summer and autumn of 2004, for snails of medical importance, nine species were recovered. these were biomphalaria alexandrina, b. glabrata, b. pfeifferi, bulinus truncatus, b. forskalii, lymnaea natalensis, bellamya (=vivipara) unicolor, physa acuta and hydrobia musaensis. parasitological examination revealed that b. alexandrina, b. glabrata and l. natalensis harboured immature stages of their concerned trematode parasites. moreover, p. acuta harboured the immature ... | 2005 | 15880994 |