| endemic focus of fasciolopsis buski infection in bangladesh. | stool surveys were conducted on children 2--10 years of age in 27 villages within dacca district and around this index area (1,668 children were sampled), revealing an endemic focus of fasciolopsis buski infection to the south and the east of dacca district. in order to determine the seasonal variation in the total snail populations and the natural rate of f. buski infection in the snails, two species of planorbid snails, segmentina (trochorbis) trochoideus and hippeutis (helicorbis) umbilicalis ... | 1982 | 7102914 |