genetic variability in the compatibility between schistosoma haematobium and its potential vectors in niger. epidemiological implications.a populational study of the compatibility between schistosoma haematobium and its potential vectors has been carried out in the niger, confronting samples of s. haematobium populations from three epidemiologic foci with bulinus populations originating from the same focus (sympatric infection) and with bulinus populations from other foci (allopatric infections). the three transmission foci selected were irrigation canals in ricefields along the niger river where one finds: bulinus truncatus rohlf ...19902382092
[malacologic-schistosomal study of the refugee camps on the plain of ruzizi in the democratic republic of the congo].bilharziasis due to schistosoma mansoni is widespread in the eastern part of the people's republic of the congo, particularly in the ruzizi plain area. the intermediate host is the fresh-water snail biomphalaria pfeifferi whose ecology is now well documented. bilharziasis due to schistosoma haematobium and schistosoma intercalatum have not yet been observed but the potential for this development is high given the presence of the intermediate hosts, i.e. bulinus truncatus, bulinus globosus, and b ...199910472580
bulinus forskalii: a new potential intermediate host for schistosoma haematobium in niger.malacological monitoring of two irrigated areas in niger highlighted the natural susceptibility of bulinus forskalii to infection with schistosoma haematobium when the parasitic load is high. this first report of s. haematobium infection in b. forskalii, which is an abundant snail in irrigated areas, has been confirmed experimentally.200717568645
breeding system and demography shape population genetic structure across ecological and climatic zones in the african freshwater snail, bulinus forskalii (gastropoda, pulmonata), intermediate host for schistosomes.the role of breeding system and population bottlenecks in shaping the distribution of neutral genetic variation among populations inhabiting patchily distributed, ephemeral water bodies was examined for the hermaphroditic freshwater snail bulinus forskalii, intermediate host for the medically important trematode schistosoma guineensis. levels of genetic variation at 11 microsatellite loci were assessed for 600 individuals sampled from 19 populations that span three ecological and climatic zones ...200415488012
distribution patterns and cercarial shedding of bulinus nasutus and other snails in the msambweni area, coast province, the msambweni area of the kwale district in kenya, an area endemic for schistosoma haematobium, potential intermediate-host snails were systematically surveyed in water bodies associated with human contact that were previously surveyed in the 1980s. bulinus (africanus) nasutus, which accounted for 67% of the snails collected, was the only snail shedding s. haematobium cercariae. lanistes purpureus was the second most common snail (25%); lower numbers of bulinus forskalii and melanoides tuberc ...200415100463
[schistosomiasis endemic in burkina faso].burkina faso, through the works of many teams of the occge based in bobo-dioulasso, has signi-ficant data on several tropical endemics of which schistosomiasis. with the complementary works, it appears to be possible to establish a distribution of the schistosomiasis which reveals its importance. it will be the first stage of the planned national control program. the parasitologic data-gathering which covers the period of 1951 to 2000, used all the standard techniques. it is about kato-kartz and ...200415104159
[epidemiologic study of s. haematobium bilharziasis in the rice fields of yagoua (north cameroon) ii. distribution and ecology of intermediate hosts].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 irrigatio ...19827201892
a study of the biological characteristics of a hybrid line between male schistosoma haematobium (dar es salaam, tanzania) and female s. intercalatum (edea, cameroun).the viability of a hybrid between male schistosoma haematobium (dar es salaam, tanzania) and female s. intercalatum (edea, cameroun) was studied for up to the f7 hybrid generation and the biological characteristics of the hybrid were compared with those of each of the parental species. using the total cercarial production/100 exposed snails/5 weeks value (tcp) as an index the hybrid miracidial infectivity to bulinus forskalii (kinshasa, zaire), the host snail for s. intercalatum, remained compar ...19852868634
[epidemiological study of schistosomes in a coastal lake of recent formation].parasitological and malacological surveys were conducted round a fresh water lake, previously a salted lagoon, in the south of bénin and leaded to measure prevalence of schistosomiasis. 23 percent of population were found positive for schistosoma haematobium and 13.4 percent for s. mansoni. prevalences were different from locality to locality according to beach variations, but mean of parasite density was quite constant. males were significantly more infected than females and young adults were m ...19902126751
a new focus of schistosoma haematobium/s. intercalatum hybrid in cameroon.terminal-spined schistosome eggs were found in both stool and urine specimens of a high proportion of infected individuals in kinding njabi, a village located in a savannah/forest ecotone of center province, cameroon. infections with terminal-spined schistosomes are not common in that region and first appeared in kinding njabi in the mid-1980s. the village population, determined by house-to-house census in 1986, was 345. of 302 stool samples examined by a thick smear technique, 58 (19%) were pos ...19911928567
[population dynamics and infestation of bulinus truncatus and bulinus forskalii by schistosomal larvae in the sudan-sahelian zone of cameroon].the evolution of the population densities of bulinus truncatus and bulinus forskalii has been studied during 18 months in a number of sites of the sudan-sahelian zone of cameroon, in relation to certain environmental factors. only the altitude of the water in the sites has an influence on the density of the snails. the populations of b. truncatus present a greater proportion of young molluscs during the entire year, with the exception of the last months of the dry season. the population dynamics ...19921292427
schistosomiasis in dogon country, mali: identification and prevalence of the species responsible for infection in the local community.the prevalence of schistosomiasis amongst the dogon people in 4 villages and one school of the bankass district of mali was determined during 2 surveys in 1992; 1398 urine and 1199 stool samples were examined. the most common schistosome was schistosoma haematobium, with an overall prevalence of 51.3%; s. mansoni had a prevalence of 12%. no s. intercalatum egg was seen in the stools. biomphalaria pfeifferi and bulinus truncatus were found in pools at the base of the dogon cliffs; bulinus forskal ...19947886759
schistosoma haematobium infection in abeokuta.ten years after the initial report of the outbreak of schistosomiasis in the vicinity of sokori stream (a tributary of ogun river) in abeokuta, nigeria, investigation was carried out to determine the present status of the disease, given the increased socioeconomic activities in the city. a total of 1670 school pupils in three schools within one kilometer radius of the stream, and 234 adults found using the stream for some water related activities were examined for eggs in their urine. one hundre ...199810456120
freshwater snail diversity in benin (west africa) with a focus on human schistosomiasis.the aim of this study was to conduct a large-scale freshwater snail survey in benin to assess the malacological diversity and the larval trematode infections with a focus on schistosoma genus. we conducted 82 freshwater snail surveys in 35 sites ranked in 4 types and belonging to 9 out of 12 departments. among 19,200 collected snails, 11 species of freshwater snails were identified. four species of human schistosome transmitting snails, bulinus forskalii, b. globosus, b. truncatus and biomphalar ...200919426659
distribution, habitats and role as intermediate host of the freshwater snail, bulinus forskalii, in south africa.this paper focuses on the geographical distribution and habitats of bulinus forskalii, the snail intermediate host of the conical fluke of equids, gastrodiscus aegyptiacus as reflected by the 1209 samples in the database of the national freshwater snail collection of south africa. the 362 different loci on record represent an extensive distribution in kwazulu-natal province, the limpopo province, the coastal areas of the eastern cape province and the south-eastern part of the north west province ...200516137134
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