| evaluation of chemical and physical-morphological factors as potential determinants of biomphalaria pfeifferi (krauss, 1848) distribution. | this study was carried out in five sites along a small perennial river system in south-central tanzania, which had been identified as the focus for transmission of intestinal schistosomiasis in the area. malacological surveys preceding the study showed a focal distribution of biomphalaria pfeifferi, intermediate host snail of schistosoma mansoni, the snails being present in three sites but absent from the other two sites. the objective of this study was to evaluate to what extent chemical and/or ... | 1997 | 9332595 |