| ecological studies of bulinus rohlfsi, the intermediate host of schistosoma haematobium in the volta lake. | in the present ecological study of cercarial transmission of schistosoma haematobium in the volta lake, ghana, habitat observations and sampling of bulinus truncatus rohlfsi were conducted within a 60-km stretch of shoreline. observations revealed that human water contact sites in each village undergo constant changes in shape and vegetation. snail sampling surveys in water contact sites were carried out monthly (for 27 months) in 8 villages using newly designed palm-leaf traps, and in 8 additio ... | 1977 | 304396 |
| trials of ecological and chemical measures for the control of schistosoma haematobium transmission in a volta lake village. | urinary schistosomiasis is highly prevalent along the shores of the volta lake in ghana, where transmission occurs focally in man-water contact sites. the intermediate host, bulinus truncatus rohlfsi, prefers to harbour in ceratophyllum, a common aquatic weed in the lake. removal of this weed reduced the density of both infected and uninfected snails, but not sufficiently to interrupt transmission.niclosamide was applied at 1, 0.7, and 0.5 mg/l in combination with weed removal at five water cont ... | 1978 | 307458 |
| epidemiology of human schistosoma haematobium infection around volta lake, ghana, 1973-75. | there was a dramatic rise in the prevalence of urinary schistosomiasis around volta lake within a year of its full impoundment in 1968. research was undertaken to investigate the epidemiology of the disease in preparation for a control programme. the interplay of three factors-age, sex, and ethnic affiliation-largely defined the demographic patterns of the prevalence and the intensity of infection. both of these increased in young children up to a peak at age 10-14 years, and then declined, the ... | 1982 | 6979420 |