| [focus on schistosoma intercalatum]. | area of frequent occurrence of schistosoma intercalatum is limited to few countries along the guinea gulf although the main intervening agents, bulinus globosus, bulinus forskalii are dispersed all over africa. reservoir of schistosoma intercalatum is only human and its cycle is difficult to keep up in test animals. clinical manifestations are, the most often, a simultaneous inflammation of the rectum and sigmoid. diagnosis is based on the presence of ova with terminal spine in feces or in biops ... | 1990 | 2077322 |
| 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 ... | 1990 | 2382092 |
| laboratory and field trials at ifakara (kilombero district, tanzania) on the plant molluscicide swartzia madagascariensis. | the molluscicidal activity of crushed seed pods of swartzia madagascariensis was assessed by laboratory and field trials. mature dry seed pods were ground and extracted in tap water for 24 h. water extracts exerted a significant molluscicidal activity against bulinus globosus up to dilutions of 100 mg of ground pods per litre. the chromatographically isolated saponin (1) responsible for the molluscicidal activity showed a toxicity of lc 100 at 3 mg/l after exposure of b. globosus and biomphalari ... | 1986 | 2872789 |
| seasonal patterns in the transmission of schistosoma haematobium, s. mattheei and s. mansoni in the highveld region of zimbabwe. | the pattern of fluctuation in the population size of bulinus globosus and biomphalaria pfeifferi, in their infection rates with schistosoma haematobium/s. mattheei and s. mansoni, respectively, and in the cercarial population size as monitored using hamster immersions, was elucidated in streams in the temperate highveld region of zimbabwe over a 27-month period during 1982-1984. the results revealed that transmission of s. mansoni was erratic and unpredictable without a clearcut seasonal transmi ... | 1987 | 2894133 |
| community water-contact patterns and the transmission of schistosoma haematobium in the highveld region of zimbabwe. | the patterns of community water-contact, their relationships to schistosoma haematobium infection in the human population and also in bulinus globosus, snail host for s. haematobium and s. mattheei were carried out at 12 human water contact sites located in stream habitats in the temperate highveld region of zimbabwe over a 27-month period during 1982-1984. it was shown that water contact was markedly heterogeneous with sex, age, type of activity and village location being the major variables af ... | 1987 | 3118479 |
| studies on the ecology of bulinus globosus, the intermediate host of schistosoma haematobium in the ifakara area, tanzania. | during a period of 2 years, the ecology of bulinus globosus was studied in 8 habitats in two streams near ifakara, se-tanzania. the relative bulinus densities were followed monthly. two different methods for estimating snail densities (man/time vs. palmleaf traps) gave comparable results. bulinus densities were constantly low throughout the year in the stream, but they showed distinct seasonal fluctuations in adjacent pools, with a density-peak at the end of the small rainy season. b. globosus, ... | 1985 | 2862780 |
| spatial and temporal heterogeneity in the population dynamics of bulinus globosus and biomphalaria pfeifferi and in the epidemiology of their infection with schistosomes. | populations of bulinus globosus and biomphalaria pfeifferi were studied in a river habitat in zimbabwe over a period of 12 months. data were obtained on the prevalences of infections of schistosoma haematobium (also s. mattheei) and s. mansoni respectively. population parameters showed the following patterns for both snail species. (1) a patchy distribution correlated with the distributions of aquatic plants. (2) life-expectancies of only a few weeks. (3) recruitment rates correlated with water ... | 1989 | 2717216 |
| the effect of schistosome infection on the mortality rates of bulinus globosus and biomphalaria pfeifferi. | schistosoma infections of bulinus globosus increased the per capita mortality rate in the laboratory from 0.231 to 0.406 per week. schistosoma mansoni infections of biomphalaria pfeifferi increased the per capita mortality rate in the laboratory from 0.055 to 0.177 per week. calculations based on data from previous work by another author indicate an increase in the mortality rate of b. pfeifferi associated with prepatent s. mansoni infection. | 1989 | 2604453 |
| the use of phytolacca dodecandra berries in the control of trematode-transmitting snails in zimbabwe. | phytolacca dodecandra, a plant with berries of a known molluscicidal potency, was cultivated in chiweshe. studies on the snail population density of bulinus globosus and lymnaea natalensis as well as schistosome infection rates in the former were carried out in two streams, in one of which a water extract of p. dodecandra berries was applied in late april and may 1987. snail sampling was carried out twice a month from april 1986 to april 1988, that is for 12 months prior to and after the mollusc ... | 1989 | 2575866 |
| the effect of schistosoma haematobium infection on the growth and fecundity of three sympatric species of bulinid snails. | three species of bulinid snails were monitored to determine the effect of infection with 2 sympatric strains of schistosoma haematobium on longevity, growth, and reproductive output, from the onset of cercarial production until death. bulinus senegalensis was least affected by infection, with total fecundity reduced by less than 34%. infected bulinus truncatus showed an acceleration in growth accompanied by a 63% reduction in fecundity, although the majority of snails continued to oviposit at a ... | 1990 | 2380865 |
| preliminary epidemiological survey of schistosomiasis in central and southern liberia. | some basic epidemiological data on schistosomiasis in central and southern liberia were collected. a study of snail density fluctuations was carried out in waterbodies bordering the road between harbel and gbarnga. samples from schoolchildren living in ten selected villages were examined for schistosoma spp. and other helminths. in the coastal region no snail hosts were found, the prevalence rates in schoolchildren were low and the infections were apparently imported. inland, the intermediate ho ... | 1980 | 6104426 |
| temporal patterns in the epidemiology of schistosome infections of snails: a model for field data. | the prevalence of patent schistosome infections of intermediate host snails often shows seasonal variations. for schistosome, mainly schistosoma haematobium, infections of bulinus globosus field data from zimbabwe show annual ranges in prevalence from 2% to 30%. in this paper a mathematical model is developed for b. globosus population dynamics and the epidemiology of schistosome infection. the model is a discrete-time analogue of a catalytic model, with an added recruitment term. snail fecundit ... | 1990 | 2345659 |
| biology, life-tables, and intrinsic rates of increase of bulinus globosus morelet and lymnea natalensis kraus (gastropoda: pulmonata)--the snail intermediate hosts of schistosoma haematobium and fasciola gigantica, respectively, in southeastern nigeria. | two tables and a figure are used to present the epidemiological and epizoological particulars of bulinus globosus and lymnaea natalensis, the intermediate hosts of schistosoma haematobium and fasciola gigantica in southeastern nigeria. possible ways of reducing the populations of these intermediate hosts are seen in the combined application of chemical agents and environmental shaping. | 1984 | 6529436 |
| molluscicidal trials and correlation between the presence of tetrapleura tetraptera in an area and the absence of the intermediate hosts of schistosomiasis and fascioliasis in southwest nigeria. | a schistosomiasis research project, carried out in southwest nigeria, yielded data by which it was possible to relate snail recovery from potential transmission sites to the presence or absence of tetrapleura tetraptera. a significant negative correlation with snail numbers was found for distance of t. tetraptera from transmission sites and fruiting of the trees when these variables were tested individually. there were no significant differences between individual variables such as ph, ca2+ conc ... | 1990 | 2255208 |
| [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 ... | 1982 | 7201892 |
| [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 ... | 1990 | 2126751 |
| population dynamics model for bulinus globosus, intermediate host for schistosoma haematobium, in river habitats. | a mathematical model is developed that describes the population dynamics of the freshwater snail bulinus globosus, an intermediate host of schistosoma haematobium. the model is developed from field data recording abundance changes, recruitment rates, and mortality rates for adult snails in river habitats in zimbabwe. rate of recruitment into the adult population is dependent on temperature, incorporating a time lag to allow for growth to adult size. mortality rate is also a function of temperatu ... | 1990 | 1971492 |
| factors affecting the intensity of reinfection with schistosoma haematobium following treatment with praziquantel. | infection with schistosoma haematobium was studied in a rural community of approximately 500 persons in eastern zimbabwe. the overall prevalence of infection, as determined by urine egg counts, was 40.1%, and of heavy infections (greater than or equal to 50 eggs/10 ml urine) was 11.0%. the prevalence of both heavy and all infections was highest in the 8 to 10-year-old age class. during 1987-88 data were obtained from 102 individuals on intensity of reinfection 14 weeks after treatment with prazi ... | 1991 | 1903882 |
| endemicity, seasonality and focality of transmission of human schistosomiasis in 3 communities in southwestern nigeria. | the pattern of transmission of human schistosomiasis was studied in 3 communities in southwestern nigeria. the prevalence of schistosoma haematobium in school children aged 5-16 years in the 3 communities was 76.2, 70.3 and 66.4%, respectively. the percentage of infected children harbouring heavy infections (greater than 50 eggs/10 ml urine) in the 3 communities was 75.5, 69.2 and 48.1% with a prevalence of visible haematuria among the heavily infected children of 29.5, 19.4 and 24.3%, respectiv ... | 1991 | 1796227 |
| [population dynamics and infestation with bulinus globosus in a sudan-sahelien zone of cameroon]. | the population dynamics of bulinus globosus was followed at seasonal and perennial habitats in three villages in the extreme north province, cameroon, known to have high prevalences of schistosoma haematobium. the study covered 2 rainy and 1 dry season between june 1987 to november 1988. of several environmental factors monitored, only rainfall and the resulting changes in water level were strongly correlated with changes in snail density, and even then only when values were at their extremes. i ... | 1991 | 1789704 |
| geographic compatibility of the freshwater snail bulinus globosus and schistosomes from the zimbabwe highveld. | populations of bulinus globosus were sampled from two rivers, 60 km apart, in northern zimbabwe, and offspring from each geographic strain reared in the laboratory. schistosomes were harvested from each strain and also maintained in the laboratory. cross-infection experiments were conducted, whereby snails of both geographic strains were exposed to parasites of both geographic strains. compatibility was found to be related to: (i) the geographic origin of the snail, and (ii) an interaction betwe ... | 1995 | 7797371 |
| seasonal population densities of snails transmitting urinary and intestinal schistosomiasis in lusaka, zambia. | the two molluscan intermediate hosts of s. haematobium schistosomiasis: bulinus africanus and bulinus globosus, were found most commonly in habitats that retained water for a substantial part of the year rather than in temporary rain-filled pools. biomphalaria pfeifferi which transmits s. mansoni were found principally in streams and impoundments like dams but scarce in rivers. in a permanent habitat, the peak density of snails was between the warm, dry months of august and september while in a ... | 1975 | 1169833 |
| [cercaria ogunis n. sp. (echinostomatidae) from bulinus globosus in west africa (author's transl)]. | cercaria ogunis n. sp. (echinostomatidae) is described. the cercaria has 47 collar spines, 2 x 15 flame cells, a small dorsal and a small ventral finfold near the tip of the tail. a peculiar organ located dorsally next to the brain is explained, hypothetically, as a statocyst. in the behaviour of the cercaria there are some conspicuous features, i.e. a rapid swimming-velocity, a striking positive geotaxis and a positive phototaxis. second intermediate hosts are gastropods and amphibians. the met ... | 1977 | 906634 |
| a longitudinal study of schistosome vector snail populations in liberia. | seasonal changes in populations of biomphalaria pfeifferi and bulinus globosus were observed at 62 locations in liberia, west africa. all varieties of water in both urban and rural locations were sampled. a wet season decrease and dry season increase of b. globosus populations in both urban and rural locations, similar to that reported elsewhere in west africa, was observed. similar fluctuations of b. pfeifferi populations were noted. the prevalence of schistosome infected vector snails varied m ... | 1979 | 572150 |
| the effect of light and darkness on the production of cercariae of schistosoma haematobium from bulinus globosus. | the cercariae of schistosoma haematobium showed a diurnal periodicity of emergence from bulinus globosus in a twelve hour light/dark cycle. peak emission occurred at 11.00 hrs with a smaller peak at 20.00 hrs, following the start of the period of darkness. in continuous illumination this second peak was not seen, indicating that only the morning peak is circadian in origin. the evening peak occurs in response to dark treatment and can be produced by periods of darkness ranging from eight seconds ... | 1987 | 3437109 |
| the geographical variation in the molluscicidal potency of phytolacca dodecandra (endod) berries in zimbabwe. | searches for phytolacca dodecandra were conducted throughout the country in order to determine the natural distribution of the plant molluscicide and to identify the plants that produce the most toxic berries. berries were collected from a total of 74 plants and bioassays performed against bulinus globosus. the berries collected from eight plants were found to be lethal to 50% or more of the snails and the most toxic berries were those collected from plants found growing in the drier and hotter ... | 1988 | 3381315 |
| schistosomiasis and intestinal parasites in rural villages in southwest nigeria: an indication for expanded programme on drug distribution and integrated control programme in nigeria. | a cross sectional survey of schistosomiasis, intestinal parasite infections and pattern of schistosomiasis transmission was undertaken in four rural villages around the erinle dam, nigeria. the prevalence of schistosoma haematobium ranged from 10% to 60%. 30% of infected school children excreted over 50 eggs/10 ml urine and high rates of haematuria, proteinuria, leucocyturia and nitrites in urine were observed in infected children and the villagers. prevalence of infection with s. mansoni ranged ... | 1993 | 8256092 |
| schistosoma curassoni brumpt, 1931 and s. bovis (sonsino, 1876) in cattle in northern nigeria. | schistosoma curassoni has been recovered from cattle in northern nigeria. rectal scrapings of 90 cows slaughtered at the kano abattoir, kano, nigeria during march and april 1986 revealed a prevalence of 7.8% s. bovis and 2.2% s. curassoni. further examination of the mesenteric and rectal veins of 502 cows showed that the overall prevalence of schistosomiasis was 31.1%. local bulinus globosus were infected successfully in the laboratory with s. bovis miracidia. | 1988 | 3372976 |
| transmission of schistosoma bovis in mkulwe (mbozi district, mbeya region, southern highlands of tanzania). | various populations of laboratory bred bulinid snails were exposed to miracidia of schistosoma bovis from mbozi. the parasite is naturally transmitted by bulinus globosus in the area. laboratory infection revealed a good relationship with b. forskalii and b. globosus from mbozi and a population of b. forskalii from dar es salaam (infection rates 100%, 63.6% and 41.7% respectively). populations of b. globosus and b. nasutus from dar es salaam were refractory. it appears that both snail species (b ... | 1988 | 3372975 |
| schistosomiasis in kano state, nigeria. i. human infections near dam sites and the distribution and habitat preferences of potential snail intermediate hosts. | stool and urine samples from 813 schoolchildren and adults from the tomas and rimin gado dam areas of kano state, nigeria, showed schistosoma haematobium to be present at both localities with prevalences of 26.6 and 36.8%, respectively. no cases of s. mansoni were found. the prevalence and intensity of s. haematobium was low and similar in both study areas. statistical analysis revealed a correlation between prevalence and location, but no evident association with professed patterns of water con ... | 1988 | 3256277 |
| passive dispersal of bulinus globosus. | | 1988 | 3250346 |
| effect of mass chemotherapy and piped water on numbers of schistosoma haematobium and prevalence in bulinus globosus in kwale, kenya. | from june 1982 to may 1986 in a small village in kwale, kenya, we studied seasonal fluctuations in populations of bulinus globosus, prevalence of schistosoma haematobium infection in this snail, and effects of chemotherapy and piped water supply on infection rate of snails. in the perennially-flowing pemba river, relatively small numbers of snails were collected; they were found only during the hot dry season (december to march). in a tributary stream, the kadingo river, whose flow ceased at the ... | 1988 | 3152776 |
| analysis of the dynamics of transmission of human schistosomiasis in the highveld region of zimbabwe. a review. | with the starting point in a comprehensive and integrated longitudinal study conducted by the blair research laboratory from march 1982 to may 1984 in bushu and chiweshe communal areas, a review is presented of the dynamics of transmission of urinary (schistosoma haematobium) and intestinal (s. mansoni) human schistosomiasis in the highveld region of zimbabwe. the study comprised observations on snail-related aspects of transmission, on human water contact patterns, and on prevalence, intensity ... | 1988 | 3143147 |
| prevalence and intensity of schistosomiasis in two rural areas in zimbabwe and their relationship to village location and snail infection rates. | surveys for schistosomiasis of 2498 people of various ages from 22 villages in northeast zimbabwe are reported. a high prevalence of schistosoma haematobium (53.1%) and a medium prevalence of s. mansoni (17.5%) were found. schistosoma haematobium prevalence among males was significantly higher than among females. age prevalence curves for both schistosome species showed a typical pattern with the peak in the ten to 20 years age group, which is also the age group with the highest potential of con ... | 1988 | 3140747 |
| field observations on the population dynamics of bulinus globosus, the intermediate host of schistosoma haematobium in the ifakara area, tanzania. | the population dynamics of bulinus globosus were studied in a stream and an adjacent pool near ifakara, tanzania. experiments with caged snails were used to determine fecundity, hatching rates, growth and mortality. growth and mortality rates were also estimated for the natural population from successive size frequency distributions. oviposition began in snails as small as 6.6 mm and there was a positive correlation between the size of the snails at oviposition and the number of embryos per egg ... | 1986 | 3712169 |
| anthraquinones in rheum palmatum and rumex dentatus (polygonaceae), and phorbol esters in jatropha curcas (euphorbiaceae) with molluscicidal activity against the schistosome vector snails oncomelania, biomphalaria and bulinus. | hot water extracts of rheum plamatum and rheum dentatus (from china) showed molluscicidal activity against the snails oncomelania hupensis, biomphalaria glabrata and bulinus globosus, which are vectors of schistosoma japonicum, s. mansoni and s. haematobium, respectively. activity was correlated with antraquinones which were identified by hplc: rhein and chrysophanol-anthron were most active (> 50% dead snails after 2 days in a 0.03% solution). molluscicidal activity was intermediate with rheum- ... | 1997 | 9472303 |
| fish predation as a factor in the distribution of lake malawi gastropods. | gastropod densities in lake malawi, africa drop dramatically below 4.5 m water depth. weed beds disappear and the number of molluscivorous cichlids increases below this depth. when molluscivores were excluded from open sand habitat by cages, due to migration and reduced predation, the density of snails increased by 40-60% within a week. alternatively, when adult cyrtocara placodon were placed into the cages, snail density equaled the controls. the molluscivores disproportionately consumed snails ... | 1986 | 3743727 |
| [epidemiologic study of intestinal and urinary bilharziasis in the tala mokolo region (mandara mountains, north cameroon)]. | in the mandara mountains, where small dams have been erected, people living in the tala mokolo district eliminate some s. haematobium eggs in 31,4% of urines samples, and some s. mansoni eggs in 38,1% of stools samples. evaluated from hemagglutination test, bilharziosis prevalence reaches 55,7%. male subjects are more frequently affected than female subjects, particularly as for as intestinal bilharziosis is concerned. urinary bilharziosis prevalence or intestinal bilharziosis prevalence are sub ... | 1985 | 3990539 |
| host-parasite relationships of bulinus globosus and b. truncatus with strains of schistosoma haematobium. | | 1972 | 4673614 |
| studies on the epidemiology of schistosomiasis in liberia: the prevalence and intensity of schistosomal infections in bong county and the bionomics of the snail intermediate hosts. | urine samples from 3548 individuals residing in six of the eight districts which comprise bong county, liberia, the project area of the bong county agricultural development project (bcadp), and fecal specimens from 3408 of these individuals were examined for schistosome ova. a total of 164 water sites, including rice paddies, were surveyed for schistosome vector snails and monthly changes in snail population density and infection rate were determined in selected water sites. bulinus globosus was ... | 1983 | 6138973 |
| a pilot control trial of schistosomiasis in central liberia by mass chemotherapy of target populations, combined with focal application of molluscicide. | in an area of high transmission of schistosoma haematobium and s. mansoni in central liberia, populations of five villages and intermediate host snails were surveyed for two years. in three of these villages focal application of molluscicide (niclosamide) in the main transmission sites was combined with mass chemotherapy of a target population representing 76 to 90% of the contamination index. in the two other villages, which served as control, the prevalence indexes remained stable or increased ... | 1983 | 6138977 |
| preliminary schistosomiasis survey in the lower volta river below akosombo dam, ghana. | snail surveys were carried out in kpong lake, in southern ghana, and along the lower volta river below the lake. bulinus globosus and biomphalaria pfeifferi were abundant in the kpong lake and b. truncatus and biom . pfeifferi, especially the latter, were widespread below the lake. urine surveys among primary school children at eight localities along the lower volta showed schistosoma haematobium prevalence rates of 38.8-96.2%. at bator and mepe , where records for an earlier survey were availab ... | 1984 | 6742926 |
| endemicity of vesical schistosomiasis in the ebonyi benue river valley, south eastern nigeria. | the investigation on the prevalence of patent and clinically severe infections with schistosoma haematobium was carried out amongst inhabitants of ebonyi benue river valley, south eastern nigeria between august 2000 and june 2001. the inhabitants are predominantly farmers. of the 3296 subjects examined from 15 randomly selected villages in the valley, 776 (23.5%) were excreting the eggs of s. haematobium in their urine. infection rates varied between 18.9% and 30.6%. the severity of infection ca ... | 2003 | 12872529 |
| on the distribution of schistosome infections among host snails. | the distribution of schistosoma haematobium infections in a population of bulinus globosus snails collected from a field site in zimbabwe is described. cercariae of both sexes emerged from a proportion of patent infected snails, as was demonstrated by the detection of paired schistosomes in hamsters each exposed to cercariae from a single snail. these snails must have been infected by two or more miracidia. analysis showed that the proportion of mixed-sex infections was higher than expected if i ... | 1990 | 2358316 |
| preliminary study of urinary schistosomiasis in a village in the delta of the senegal river basin, senegal. | three years after the first cases of urinary schistosomiasis infection were reported in the village of mbodiene, senegal, schistosoma haematobium eggs were found in 87% of the inhabitants of this village; 30% were heavily infected (> 50 eggs per 10 ml urine). the prevalence of infection was very high in all age groups, but children showed more intense infections. no difference between sexes was found. in the special situation of a very high prevalence, test strips for proteinuria and haematuria ... | 1994 | 7570817 |
| vesical schistosomiasis at odau village in ahoada local government area, rivers state, nigeria. | studies on urinary schistosomiasis and its snail vector was undertaken between october 1991 and september 1992 in odau. of the 890 urine specimens examined 514 (57.8%) were infected. 235 (45.7%) were excreting under 100 eggs per 10ml urine, 167 (32.5%) were excreting between 100-500 eggs per 10ml urine while 112 (21.7%) were excreting more than 500 eggs in 10ml of urine. of the 514 infected persons 336 (60.5%) were males and 178 (53.1%) were females. overall peak infection (78.7%) occurred in 10 ... | 1995 | 7626537 |
| schistosoma mattheei infections in cattle: changes associated with season and age. | the schistosoma mattheei egg output was monitored in 31 cattle over a 18-month period on a dairy farm near lusaka (zambia). the animals were kept on pasture with free access to two streams which were suitable for the intermediate host, bulinus globosus. individual faecal egg excretion reached an average peak of 130 eggs per gram, around 9 months after birth and decreased markedly before the age of 18 months. average counts declined significantly with age, down to less than five eggs per gram in ... | 1995 | 7660567 |
| urinary and intestinal schistosomiasis in the tono irrigation scheme, kassena/nankana district, upper east region, ghana. | human- and snail-related aspects of transmission of urinary and intestinal schistosomiasis were studied in the tono irrigation scheme in northern ghana. the scheme became operational in 1977. in some schools, prevalences and intensities of both schistosoma mansoni and s. haematobium infection were alarmingly high, pointing to human schistosomiasis being at least focally a health problem of major public health concern. positive correlations between intensity of schistosome infection, as measured ... | 1994 | 7716395 |
| [epidemiology of schistosomiasis in a suburban school area of bamako (republic of mali)]. | epidemiology of schistosomiasis has been assessed in october, 1990 in three primary schools of a suburban district of bamako: magnambougou. it was a cross sectional study which was carried out on an hazardous sample of 549 pupils of 7 to 14 years old. the kato-katz and urine filtration methods were used to search schistosome eggs. the prevalence rate was 50% (256/512) in schistosoma haematobium and 5.6% (26/464) in s. mansoni. children from 11-14 years old were more infected by schistosoma haema ... | 1995 | 7787449 |
| studies on transmission and schistosome interactions in senegal, mali and zambia. | the transmission and interaction of schistosomes in the senegal river basin in mali and zambia are reviewed and some preliminary field data are presented. in the senegal river basin four species of schistosomes are prevalent: schistosoma mansoni, s. haematobium, s. bovis and s. curassoni as well as the following potential intermediate hosts: biomphalaria pfeifferi, bulinus globosus, b. umbilicatus, b. truncatus, b. senegalensis and b. forskalii. the role of each of these species in the transmiss ... | 1994 | 7825224 |
| human urinary schistosomiasis transmission foci and period in an endemic town of ijebu north, southwest nigeria. | human urinary schistosomiasis transmission foci and period were investigated in an endemic town in ijebu north, southwest nigeria. three important streams (areru, eri-oru and ojupon) were sampled using long-handled scoop and a pair of tongs, between september 2002 and october 2003. out of the 3500 freshwater snails collected, six species were identified which are lanistes libycus (46.7%), potadoma moerchii (31.4%), melanoides tuberculata (1.5%), bulinus globosus (18.2%), b.forskalii (0.2%) and a ... | 2004 | 16493394 |
| investigation into the prevalence of urinary schistosomiasis in the agulu lake area of anambra state, nigeria. | in epidemiological surveys for urinary schistosomiasis caused by schistosoma haematobium in communities around agulu lake, anambra state, nigeria, between 1990 and 1992, the infection was found to be endemic in the area, especially in three towns: nri, agulu, and adazi nnukwu. the prevalence rates varied between these communities and with the year. inter-town prevalence rates ranged from 5.96% to 54.00%. intravillage prevalence rates ranged between 5.50% to 96.43%. prevalence rates were highest ... | 1994 | 7930452 |
| schistosomiasis around siavonga, on the shores of lake kariba, zambia. | a schistosomiasis prevalence survey was carried out at lake kariba, zambia--only the second since the creation of the lake more than 30 years ago. in the 20 or so years since the first study the prevalence of schistosoma mansoni has increased from 16% to 56% while that of s. haematobium has dropped from 69% to 17%. there was variability in the infectivity of contact sites (p < 0.001) and this had an impact on prevalence. in contrast, sex, age (within the range 5-19 years), residential area (dist ... | 1993 | 8250627 |
| genetic structure and parasite compatibility of bulinus globosus (gastropoda: planorbidae) from two areas of different endemicity of schistosoma haematobium in zimbabwe. | a comparative study of the genetic structure of 8 populations of b.globosus from 2 areas of different endemicity of schistosoma haematobium was done. five populations were from chiweshe (high endemicity) and three were from plumtree (low endemicity). genetic structure, as determined by allozyme genetics, revealed high levels of genetic variability in chiweshe populations (ho = 0.12-0.26) and low levels in plumtree (ho = 0.06-0.12). populations from chiweshe were genetically heterogeneous whereas ... | 1996 | 8786216 |
| royal society of tropical medicine and hygiene meeting at manson house, london, 18 may 1995. the epidemiology of human schistosomiasis in the senegal river basin. | extensive water development has taken place in the north of senegal over the last decade, resulting in a large increase in the amount of fresh water for irrigation. the objectives of the present study were to determine the prevalence and intensity of schistosoma mansoni and s. haematobium in the senegal river basin (srb), and to ascertain the distribution of the snail species acting as intermediate hosts for both species of schistosomes. the schistosomiasis survey started in january 1994 and was ... | 1996 | 8882173 |
| integrated control trial of schistosomiasis at nakiwogo fishing village near entebbe, uganda. | using the kato katz technique, 600 people living in nakiwogo fishing village at lake victoria, uganda, were examined for schistosoma mansoni infection. the total population of this village was estimated between 1,000 and 1,500 mainly consisting of migrants from western uganda. of the 600 individuals in the study group, 328 people (54.7%) were found to be infected with s. mansoni. the geometric mean egg count was 422 eggs per gramme of stool. a survey of the snail intermediate hosts for s. manson ... | 1996 | 8898461 |
| schistosomiasis in lake malawi. | in 1992 two us peace corps volunteers (pcvs) developed central nervous system schistosomiasis due to infection with schistosoma haematobium following recreational water exposure at cape maclear on lake malawi, an african lake considered by many to be free of schistosomiasis. to determine the transmission potential and risk for aquiring schistosomiasis in lake malawi, a cross-sectional survey of resident expatriates and visitors to malawi was done during march and april, 1993. | 1996 | 8909380 |
| laboratory experiments on snail predation by sargochromis codringtoni, a candidate for biological control of the snails that transmit schistosomiasis. | the potential efficacy of sargochromis codringtoni, a species of cichlid fish, in the biological control of snails carrying the schistosoma spp. infecting man has long been recognized. a laboratory study to produce much-needed data on the malacophagous characteristics of this fish was conducted, to see if field studies on its possible role as a biological agent for snail control in zimbabwe were likely to be worthwhile. the fish can consume large numbers of snails within a short period: a single ... | 1997 | 9093434 |
| intraspecific diversity of schistosoma haematobium in west africa: chronobiology of cercarial emergence. | cercarial emergence patterns were used to analyse the intraspecific variability within and between nine populations of schistosoma haematobium collected along a transect line from the north to the south of the ivory coast (africa) and using bulinus truncatus or bulinus globosus as intermediate snail hosts. statistical comparison demonstrated the existence of a chronobiological polymorphism and the existence of three homogeneous groups of s. haematobium isolates with mean shedding times of the ce ... | 1997 | 9177094 |
| molecular characterization of bulinus globosus and b. nasutus on zanzibar, and an investigation of their roles in the epidemiology of schistosoma haematobium. | the ribosomal internal transcribed spacer (its) regions of both bulinus globosus and b. nasutus from zanzibar were amplified and restricted with 6 enzymes. restriction products were separated by polyacrylamide gel electrophoresis and visualized by ethidium bromide staining. considerable genetic variation was observed at 3 levels: (i) between species, (ii) among populations and (iii) among individuals. in addition, the 18s ribosomal deoxyribonucleic acid gene was amplified from both species and t ... | 1997 | 9231216 |
| molluscicidal activity of solanum aculeatum (family: solanaceae) berries against biomphalaria pfeifferi, bulinus globosus and lymnaea natalensis. | aqueous suspensions of powder of sun- or freeze-dried berries of the plant solanum aculeatum (family solanaceae), indigenous in kenya, were tested for molluscicidal activity against biomphalaria pfeifferi, bulinus globosus and lymnaea natalensis under laboratory conditions. one hundred or 50 mg powder l-1 of sun- or freeze-dried berries killed over 60% of the test b. pfeifferi, bul. globosus and l. natalensis. whereas 25 mg l-1 of the sun dried material killed less than 60% of the test snails, s ... | 2009 | 2772517 |
| cercarial density in the river of an endemic area of schistosomiasis haematobia in kenya. | the cercarial density in natural water and number of infected bulinus globosus were monitored over a one-year period to identify the transmission foci in an endemic area of schistosomiasis haematobia in kenya. overall prevalence and intensity of infection of the study community were 59.2% and 10.9 eggs/10 ml of urine. cercariometry was carried out on 456 occasions at 20 study sites while snail sampling was done on 465 occasions at the same sites over a one-year period. cercariometry was exclusiv ... | 1997 | 9288809 |
| [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 ... | 1999 | 10472580 |
| the impact of the local water-development programme on the abundance of the intermediate hosts of schistosomiasis in three villages of the senegal river delta. | the populations of the potential intermediate hosts of schistosoma mansoni and s. haematobium were studied for a year at transmission sites near three villages in the lower delta of the senegal river. biomphalaria pfeifferi, found to be widely distributed and increasingly abundant, appears to be well adapted to the new areas of irrigation (created by the dams at diama and manantali) thanks to its ability to withstand changes in temperature and to aestivate. this species is responsible for intens ... | 1999 | 10474638 |
| host-parasite population genetics: a cross-sectional comparison of bulinus globosus and schistosoma haematobium. | the genetic population structures of the freshwater snail bulinus globosus and its trematode parasite schistosoma haematobium from 8 river sites in the zimbabwean highveld were compared using randomly amplified dna (rapd) markers. there was significant variability between snail populations collected at different sites, but schistosome populations only showed differentiation at a wider geographical scale (between 2 non-connected river systems). for snails, genetic distance was better correlated w ... | 1999 | 10503255 |
| bulinus nyassanus is an intermediate host for schistosoma haematobium in lake malawi. | at cape maclear on the nankumba peninsula, close to the southern end of lake malawi, schistosoma haematobium is highly prevalent in the local people and many tourists become infected with this parasite each year. a 'bilharzia control programme' was initiated in this area in august 1998, as a development collaboration between the government of malawi, the danish agency for development assistance (danida), and the danish bilharziasis laboratory. although bulinus globosus is a known host for s. hae ... | 2001 | 11454245 |
| a preliminary assessment of the potential of the muschovy duck (cairina maschata) as a biocontrol agent of schistosomiasis intermediate host snails. | to assess the impact of muschovy ducks on snail populations. | 2000 | 11682935 |
| snail-parasite compatibility and prevalence of schistosoma haematobium on the shores of lake kariba, zambia. | reduced snail-parasite compatibility might be at least partially responsible for the decrease observed, over the last three decades, in the prevalence of urinary schistosomiasis on the shores of lake kariba, zambia. to explore this possibility, the prevalences of urinary schistosomiasis in schoolchildren were investigated in three disparate areas of zambia (lake kariba, lake bangweulu and lusaka), and attempts were made to infect the snails that developed from the eggs of snails collected from e ... | 2002 | 12080977 |
| transmission of schistosomiasis in kariba, zimbabwe, and a cross-sectional comparison of schistosomiasis prevalences and intensities in the town with those in siavonga in zambia. | given that the two communities lie only 10 km apart, on the northern shore of lake kariba, it is surprising that human schistosomiasis now appears to be a much less important health problem in kariba town (zimbabwe) than in siavonga town (zambia). in an attempt to explain this difference, the level and sites of schistosoma haematobium and s. mansoni transmission in kariba, and the prevalences and intensities of human infection with these parasites in both communities, have now been investigated. ... | 2003 | 14511559 |
| [schistosomiasis due to schistosoma intercalatum and urbanization in central africa]. | the species name of schistosoma intercalatum, fischer 1934 is linked to the shape and the size of his eggs, which are intermediate between those of s. haematobium and s. bovis. s. intercalatum is the instrument of an intestinal form of schistosomiasis looking like the form induced by s. mansoni but characterized by a low location of the lesions, mainly situated at the rectum and sigmoid level. the spreading area of s. intercalatum is bound to central africa. the foci are often urban and of a siz ... | 2003 | 14582292 |
| [urban schistosomiasis in cameroon: a longitudinal study of its transmission in a new site of an extension of the intestinal schistosomiasis focus in mélen, yaoundé]. | in order to to set up the present situation on schistosomiasis in the neighbourhoods around the university of yaounde i campus, a malacological survey (collection of freshwater snails, their identification and tests on cercarial emergence) was carried out monthly over 12 months in 2 water sources, followed by a parasitological diagnosis of intestinal schistosomiasis in subjects who acknowledge having come into contact with the infested water course. the malacological survey revealed 4 freshwater ... | 2004 | 15104156 |
| the relative susceptibilities of juvenile and adult bulinus globosus and bulinus truncatus to the molluscicidal activities in the fruit of ghanaian blighia sapida, blighia unijugata and balanites aegyptiaca. | the relative susceptibilities of juvenile (2- to 3-week-old) and adult (5- to 7-week-old) bulinus globosus and bu. truncatus to the molluscicidal activities of aqueous preparations of the powdered, dried fruits of blighia sapida, bl. unijugata and balanites aegyptiaca were investigated under laboratory conditions. for the extract prepared from the freeze-dried, semi-ripe fruits of bl. sapida, the concentrations killing 95% of the snails after an exposure for 24 h (lc95) were, respectively, 232.7 ... | 2005 | 15814040 |
| susceptibility of 7 freshwater gastropod species in zimbabwe to infection with gastrodiscus aegyptiacus (cobbold, 1876) looss, 1896. | gastrodiscosis outbreaks due to gastrodiscus aegyptiacus were recorded in horses in the vicinity of harare, zimbabwe, in the absence of bulinus forskalii, b. senegalensis and cleopatra sp. which are considered to be the only intermediate host snails. this suggested the possibility of other snail species acting as intermediate hosts in the life cycle of the trematode. a study was carried out to determine the susceptibility of 7 freshwater snail species to infection with g. aegyptiacus. first gene ... | 2004 | 15830604 |
| the effects of quarry mining on the epidemiology of schistosoma haematobium in schoolchildren, in ishiagu, south-eastern nigeria. | over the last two decades there has been a noticeable increase in the activities of quarry-mining companies in the ishiagu area of south-eastern nigeria. these activities have produced an ever-growing number of abandoned quarry pits that usually quickly fill with water and appear to become suitable habitats for the freshwater snails that may act as intermediate hosts of schistosoma haematobium. to examine the potential role of quarry mining on the prevalence of urinary schistosomiasis caused by ... | 2006 | 16492363 |
| population genetic structure of the schistosome-vector snail bulinus globosus: examining the role of genetic drift, migration and human activities. | bulinus globosus, one of the intermediate hosts of the genus schistosoma, is an hermaphrodite freshwater snail species. this species occupies different kinds of environments in africa, which are generally subjected to large variations in water availability. the mating system of this species is outcrossing, although selfing has been suggested for one population. here we investigate the genetic structure of populations of b. globosus in natural and human-modified environments from niger and ivory ... | 1994 | 8014059 |
| inland valley swamp rice development: malaria, schistosomiasis, onchocerciasis in south central sierra leone. | the prevalence of malaria, schistosomiasis and onchocerciasis was determined in 1,106 residents of five villages in the moyamba district, southern sierra leone, to determine whether inland valley swamp (ivs) development was associated with changes in the prevalence of malaria, schistosomiasis and onchocerciasis in these villages. these parasitic diseases were studied in four villages receiving ivs, food and agricultural organization (fao) assistance and in one village not receiving fao assistanc ... | 1994 | 8183970 |
| micro-epidemiology of urinary schistosomiasis in zanzibar: local risk factors associated with distribution of infections among schoolchildren and relevance for control. | although it is well recognised that both behavioural and environmental factors play a role in determining small-scale heterogeneities in schistosomiasis transmission, empirical evidence of their relative importance is often limited. a study was conducted around chaani, a village in northern unguja (zanzibar) where urinary schistosomiasis is endemic, in order to shed light upon the micro-epidemiology of schistosoma haematobium and patterns of infection within schoolchildren and the intermediate h ... | 2008 | 17996207 |
| genitourinary schistosomiasis among pre-primary schoolchildren in a rural community within the cross river basin, nigeria. | in africa, most schistosomiasis control programmes defined the age 5-19 years as the target population for nationwide control through the school systems, excluding the under fives. a study was therefore undertaken to determine the prevalence and intensity of genitourinary schistosomiasis in children aged 0-5 years (pre-primary) in adim, a rural and endemic community within the cross river basin, nigeria. of the 126 children examined, 25 (19.8%) were infected with schistosoma haematobium, with no ... | 2007 | 18005467 |
| schistosoma haematobium in lake malaŵi: susceptibility and molecular diversity of the snail hosts bulinus globosus and b. nyassanus. | intermediate hosts of schistosoma haematobium, the causative agent of urinary schistosomiasis, in lake malaŵi include: bulinus globosus, a member of the b. africanus group and b. nyassanus, a diploid member of the b. truncatus/tropicus species complex. we compared genetic variability between isolates of s. haematobium from the southern part of the lake (cape maclear), where both b. globosus and b. nyassanus play a role as intermediate hosts, and isolates from the northern part, where only b. glo ... | 2008 | 18752711 |
| host choice and penetration by schistosoma haematobium miracidia. | schistosome parasites commonly show specificity to their intermediate mollusc hosts and the degree of specificity can vary between parasite strains and geographical location. here the role of miracidial behaviour in host specificity of schistosoma haematobium on the islands of zanzibar is investigated. in choice-chamber experiments, s. haematobium miracidia moved towards bulinus globosus snail hosts in preference to empty chambers. in addition, miracidia preferred uninfected over patent b. globo ... | 2009 | 18922204 |
| molecular approaches to the identification of bulinus species in south-west nigeria and observations on natural snail infections with schistosomes. | the current study considers the distribution of a small sample of 138 bulinus snails, across 28 localities within eight nigerian states. snails were identified using a combination of molecular methods involving both dna sequencing of a partial cytochrome oxidase subunit 1 (cox1) fragment and restriction profiles obtained from ribosomal internal transcribed spacer (its) amplicons. the results showed that the majority of bulinus samples tested belonged to the species bulinus truncatus while only t ... | 2010 | 20854706 |
| malacological survey and geographical distribution of vector snails for schistosomiasis within informal settlements of kisumu city, western kenya. | abstract: | 2011 | 22152486 |
| polymerase chain reaction (pcr) investigations of prepatent schistosoma haematobium cercariae incidence in five water bodies, south west, nigeria. | this study investigated the levels of prepatent s. haematobium infection in water samples collected from schistosomiasis haematobium transmission namely: international institute of tropical agriculture (iita) river and eleyele river in oyo state, oyan dam and shokori river in ogun state, badagry lagoon and lagoon (university of lagos, lagos state). | 2012 | 23678640 |
| schistosomiasis outbreak investigation, empandeni ward, mangwe district, matabeleland south province, june 2012; a case control study. | on 20th of june 2012, 31 pupils from kwite primary school reported to the local clinic complaining of passing bloody urine. a study was conducted to identify factors, the etiology and risks of contracting the disease. | 2014 | 25204324 |
| divergent effects of schistosoma haematobium exposure on intermediate-host snail species bulinus nasutus and bulinus globosus from coastal kenya. | schistosoma haematobium infection causes urogenital schistosomiasis, a chronic inflammatory disease that is highly prevalent in many parts of sub-saharan africa. bulinid snails are the obligate intermediate hosts in the transmission of this parasite. in the present study, bulinus globosus and bulinus nasutus snails from coastal kenya were raised in the laboratory and exposed to miracidia derived from sympatric s. haematobium specimens to assess the species-specific impact of parasite contact and ... | 2017 | 28115664 |
| urogenital schistosomiasis transmission on unguja island, zanzibar: characterisation of persistent hot-spots. | elimination of urogenital schistosomiasis transmission is a priority for the zanzibar ministry of health. preventative chemotherapy together with additional control interventions have successfully alleviated much of the disease burden. however, a persistently high schistosoma haematobium prevalence is found in certain areas. our aim was to characterise and evaluate these persistent "hot-spots" of transmission and reinfection in comparison with low-prevalence areas, to support the intervention pl ... | 2016 | 27986092 |
| detection of genetic diversity within snail intermediate hosts of the genus bulinus by using random amplified polymorphic dna markers (rapds). | a polymerase chain reaction-based polymorphic assay procedure (rapd) was used to study the genetic diversity of intermediate host snails within the genus bulinus. genetic differentiation was detected between two closely related species: bulinus globosus and bulinus umbilicatus. evidence is presented demonstrating the potential of rapd markers for differentiating populations of b. forskalii from different countries (cameroon, equatorial guinea and ivory coast) or from the same country (cameroon). ... | 1993 | 8147277 |
| modelling the spatial and seasonal distribution of suitable habitats of schistosomiasis intermediate host snails using maxent in ndumo area, kwazulu-natal province, south africa. | schistosomiasis is a snail-borne disease endemic in sub-saharan africa transmitted by freshwater snails. the distribution of schistosomiasis coincides with that of the intermediate hosts as determined by climatic and environmental factors. the aim of this paper was to model the spatial and seasonal distribution of suitable habitats for bulinus globosus and biomphalaria pfeifferi snail species (intermediate hosts for schistosoma haematobium and schistosoma mansoni, respectively) in the ndumo area ... | 2016 | 27814746 |
| population genetic structure of the freshwater snail, bulinus globosus, (gastropoda: planorbidae) from selected habitats of kwazulu-natal, south africa. | the freshwater snail bulinus globosus is an important intermediate host of schistosoma haematobium, the causative agent of urinary schistosomiasis. this disease is of major health concern, especially in africa where the majority of cases have been reported. in this study the inter- and intra-genetic diversity and population genetic structure of b. globosus from nine locations in the kwazulu-natal province of south africa was studied using four polymorphic microsatellite loci (bgz1-bgz4). moderat ... | 2016 | 27267152 |
| survival rates of bulinus globosus during aestivation. | | 1990 | 2222032 |
| schistosomiasis in malawi: a systematic review. | schistosomiasis remains an important public health problem that undermines social and economic development in tropical regions of the world, mainly sub-saharan africa. we are not aware of any systematic review of the literature of the epidemiology and transmission of schistosomiasis in malawi since 1985. therefore, we reviewed the current state of knowledge of schistosomiasis epidemiology and transmission in this country and identified knowledge gaps and relevant areas for future research and re ... | 2014 | 25490938 |
| prevalence and transmission dynamics of schistosoma haematobium infection in a rural community of southwestern ebonyi state, nigeria. | a twelve-month epidemio-ecological study on the prevalence, infection intensity, water contact and vector aspects of urinary schistosomiasis was conducted in a rural community of south-west ebonyi state, nigeria, using standard procedures, and involving 894 individuals (527, 58.9% males; and 367, 41.1% females). an overall community prevalence (15.3%) was established with more males (20.7%) than females (7.6%) being significantly positive for both micro-and macro-haematuria (χ² = 0.806; df = 1, ... | 2014 | 24862047 |
| significant population genetic structure of the cameroonian fresh water snail, bulinus globosus, (gastropoda: planorbidae) revealed by nuclear microsatellite loci analysis. | in order to characterize the demographic traits and spatial structure of cameroonians bulinus globosus, intermediate host of schistosoma haematobium, genetic structure of seven different populations, collected from the tropical zone, was studied using six polymorphic microsatellites. intrapopulation genetic diversity ranged from 0.37 to 0.55. interpopulation genetic diversity variation clearly illustrated their significant isolation due to distance with gene flow substantially limited to neighbo ... | 2014 | 24751417 |
| schistosomiasis in pre-school-age children and their mothers in chikhwawa district, malawi with notes on characterization of schistosomes and snails. | to complement ongoing schistosomiasis control within national control programmes (ncps) that administer praziquantel to school-age children, assessing the risk and extent of schistosomiasis in pre-school-age children (psac) is important. | 2014 | 24690282 |
| urinary schistosomiasis in urban and semi-urban communities in south-eastern nigeria. | in view of the massive rural-to-urban migration in nigeria, investigations on transmission of urinary schistosomiasis were carried out in urban and semi-urban communities in nike lake area of enugu state, nigeria. | 2013 | 24454442 |
| [parasitological profile of two forms of schistosomiasis (urinary and intestinal forms) at ten sites in burkina faso (sub-saharan africa country)]. | in spite of great progress in schistosomiasis control during the last decade in burkina faso, this disease remains a public health concern in the country. indeed, our study consisted of the analysis of parasitological data related to schistosoma haematobium and schistosoma mansoni and in malacological investigations. the prevalence rate of schistosoma haematobium varies from 3.3% to 50.4% and from 3.3% to 39.1% for schistosoma mansoni, but only in the western part of burkina faso. schoolboys are ... | 2013 | 23916210 |
| use of sentinel snails for the detection of schistosoma haematobium transmission on zanzibar and observations on transmission patterns. | urogenital schistosomiasis is an important public health issue in zanzibar. transmission of the parasite to the human population is related to the distribution of the intermediate snail host, bulinus globosus. we measured b. globosus abundance and schistosoma haematobium prevalence within snails in a series of naturally occurring populations and compared prevalence detected by observing cercarial shedding for patent infections, and by pcr using drai repeat. a total of 2146 b. globosus were colle ... | 2013 | 23318933 |
| bulinus globosus (planorbidae; gastropoda) populations in the lake victoria basin and coastal kenya show extreme nuclear genetic differentiation. | bulinus globosus, a key intermediate host for schistosoma haematobium that causes urinary schistosomiasis, is a hermaphroditic freshwater planorbid snail species that inhabits patchy and transient water bodies prone to large seasonal variations in water availability. although capable of self-fertilizing, this species has been reported to be preferentially out crossing. in this study, we characterized the population genetic structure of 19 b. globosus populations sampled across the lake victoria ... | 2013 | 23266524 |
| [comparative study of schistosomiasis transmission (urinary and intestinal forms) at 10 sites in burkina faso (in sub-saharan africa)]. | despite great progress in schistosomiasis control over the past decade in burkina faso, this disease remains a public health problem. this study analyzes parasitologic data from investigations of schistosoma haematobium, s. mansoni, and mollusks. the prevalence rate of s. haematobium varies from 3.3% to 50.4%; that for s. mansoni (tested only in the western part of the country) from 3.3% to 39.1%. prevalence rates are higher in school-aged boys than girls, but the reverse is true among adults. s ... | 2016 | 23174311 |
| unabated schistosomiasis transmission in erinle river dam, osun state, nigeria: evidence of neglect of environmental effects of development projects. | the status of schistosoma haematobium infection around erinle dam in osun state, nigeria, was investigated 10 years after the disease was first reported in the area. school children in two rural communities (ilie and oba-ile) were examined for infection and the lake surveyed for snail intermediate host species between march 2000 and february 2001. overall infection rate among 320 children examined in both communities was 46.6% (52.3% in ilie and 43.0% in oba-ile). mean intensity of infection ran ... | 2006 | 16772006 |