| schistosomiasis in omo national park of southwest ethiopia. | schistosomiasis mansoni infection was found in more than 50 tourists who had visited omo national park, ethiopia, and bathed and swum in the mui river. a survey revealed schistosoma mansoni infection in 41% of park residents and in 33% of the neighboring suri people. eggs were found in stools and adult worms at autopsy of wild papio anubis and cercopithecus aethiops. trematode larvae were found in 27% of biomphalaria pfeifferi snails found in the mui river. the source of the disease and the impl ... | 1979 | 110163 |
| [an epidemiological study of foci of s. mansoni bilharziosis in minkana and nalassi (lekie division, cameroun) (author's transl)]. | the epidemiological survey involved the examination of the total population of the two villages as well as the investigation of the freshwater snails in the neigbouring waters bodies. biomphalaria camerunensis and biomphalaria pfeifferi were found to be the intermediate hosts of schistosoma mansoni. the cassage of eggs in the stools was more frequently observed in two groups, those aged 10-19 years and in the elderly women. the study of the prevalence of the disease by means of the indirect immu ... | 1978 | 373026 |
| [differences in the sensilla of african and american cercaria of schistosoma mansoni, the agent of human intestinal bilharziasis]. | schistosoma mansoni parasite of the human intestinal bilharziasis is frequently transmitted in africa by the snail biomphalaria pfeifferi and in america by biomphalaria glabrata. the comparison between four african strains of cercariae obtained from biomphalaria pfeifferi and five american strains from biomphalaria glabrata points out variations in the number and arrangement of the sensory receptors. | 1977 | 404049 |
| schistosome infection rates in field snails: schistosoma mansoni in biomphalaria pfeifferi from kenya. | six collections of biomphalaria pfeifferi were made in the nairobi and machakos areas of kenya. individual cercarial shedding (method a) showed that 6.9% (65/938) of the snails had mature 'patent' schistosoma mansoni infections (range 3.1--34% in the six collections). crushing (method b) about one-third of the remaining snails detected no additional mature infections but yielded 1.4% (four snails from one collection) with secondary sporocysts from immature 'prepatent' infections. weekly shedding ... | 1979 | 496488 |
| investigation of molluscicidal activity of certain sudanese plants used in folk-medicine. i. a preliminary biological screening for molluscicidal activity of certain sudanese plants used in folk-medicine. | a preliminary biological screening for molluscicidal activity of certain sudanese plants used in folk-medicine was carried out. 78 samples belonging to 51 species, 45 genera and 28 families were screened. the aqueous extracts of 18 samples belonging to 8 species, 6 genera and 5 families were found to be active against bulinus truncatus and 7 of these were also found to be active against biomphalaria pfeifferi. successive extraction of the 18 active samples with petroleum ether, ethanol and water ... | 1979 | 529347 |
| the epidemiology of schistosomiasis in the vicinity of lake sibaya, with a note on other areas of tongaland (natal, south africa). | the epidemiology of human and bovine schistosomiasis in the lake sibaya area of tongaland, south africa, an undeveloped rural environment, is discussed. the mean prevalence of schistosoma haematobium infection is 72%, but s. mansoni is absent; possible reasons for this are given and the different types of water habitat are shown to play different roles in transmission. fear of crocodiles and hippopotami is important because villagers are compelled to use for domestic purposes, the smaller, shall ... | 1979 | 539856 |
| studies of the relationship between schistosoma and their intermediate hosts. iii. the genus biomphalaria and schistosoma mansoni from egypt, kenya, sudan, uganda, west indies (st. lucia) and zaire (two different strains: katanga and kinshasa). | the compatibility between strains of schistosoma mansoni from egypt, kenya, sudan, uganda, the west indies, and zaire (two strains which came from katanga and from kinshasa), and various species and strains of biomphalaria, i.e. biomphalaria pfeifferi, b. alexandrina, b. glabrata and b. camerunensis was investigated. data as mortality, rate of infection of the surviving snails, duration of infection, cercarial production per day per positive snail, etc., were observed. the main emphasis was plac ... | 1979 | 541498 |
| 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 |
| ultrastructural changes in the body wall of schistosoma mansoni during the transformation of the miracidium into the mother sporocyst in the snail host biomphalaria pfeifferi. | the ultrastructure of the body wall of the free miracidium of schistosoma mansoni and the changes occurring within 48 h after penetration into the intermediate host biomphalaria pfeifferi are described. within 2 h after penetration the ciliated plates are shed into the haemolymph of the snail and phagocytized by amoebocytes. at the same time the narrow ridges between the plates of the free miracidium expand to form the continuous outer layer of the sporocyst. within 48 h the entire tegumental st ... | 1978 | 695828 |
| [life cycle of the trematode echinostoma caproni richard, 1964 (echinostomatoidea) (author's transl)]. | the life cycle of the trematode echinostomatoidea echinostoma caproni richard, 1964, develops under natural conditions in madagascar in a bird falco newtoni and in a gastropod biomphalaria pfeifferi. metacercaries encyst in other molluscs and in the kidney of an amphibian ptychadaena mascareniensis. the cycle has been reproduced experimentaly in france. the defivitive hosts are the white mouse, the rat and the chick. biomphalaria galbrata is the first and the second intermediate host. metacercar ... | 1978 | 697289 |
| [chaetotaxic variations of the cercaria schistosoma mansoni from a human strain during successive transmissions through mice (author's transl)]. | the "cercarian chaetotaxic index" from the human strain of schistosoma mansoni from west africa is conspicuously modified during the third transmission biomphalaria pfeifferi-white mouse only. this might be the explanation why planorbs collected in guadeloupe discharge slightly different cercariae whether they come from stations where the infestation is predominantly from human origin or from stations where the infestation is predominantly from murine origin. on the contrary, the "grand etang" s ... | 1978 | 727643 |
| ecological studies in madagascar of biomphalaria pfeifferi, intermediate host of schistosoma mansoni. 2. biology and dynamics in the non-endemic area of antananarivo. | the region of antananarivo, where schistosomiasis is not yet endemic, is compared to ambositra, a well established focus of s. mansoni, with regard to climate, hydrology and snail habitats. higher mean temperatures and a more pronounced dry season in antananarivo contribute to sometimes less favourable hydrological conditions. biomphalaria is found in very few and limited habitats. population dynamics were followed up in selected habitats and showed ecological parameters comparable to those of t ... | 1978 | 747438 |
| a study of the relationship between the energy contents of schistosoma mansoni cercariae and their death during penetration of mammalian host skin. | immersion of biomphalaria pfeifferi in 1.5% glucose solution showed that the snails did not absorb any glucose during the first six hours but that almost 30% of the glucose was absorbed after 24 hours. the glycogen content of such "glucose-fed" snails was much higher than that of control normal snails. cercariae of s. mansoni collected from the former snails exhibited a much lower level of death (20%), during penetration of mouse skin, than that of control normal cercariae (36%). it is suggested ... | 1978 | 752056 |
| [chaetotaxic variations of the miracidia of schistosoma mansoni according to the adaptation to muridae. experimental and epidemiological data in guadeloupe (author's transl)]. | the "miracidial chaetotaxic index" of a human strain of schistosoma mansoni from west-africa displays an abrupt decrease following three first transmissions biomphalaria pfeifferi, white mouse. then it increases gradually up to a new balance. the value of the index permits to estimate the human or murine characteristic of the natural infections in guadeloupe. according to stations the index of miracidia issued from rats is widely different. stations where both rat and man are infected show stron ... | 1978 | 754619 |
| the suppression, by helisoma duryi, of the cercarial production of schistosoma mansoni-infected biomphalaria pfeifferi. | biological control of the intermediate hosts of schistosoma mansoni and s. haematobium by means of a competitor snail, helisoma duryi, has been suggested. in the present laboratory study, the influence of h. duryi on the relationship between the parasite and the intermediate host was investigated. the results indicated that h. duryi behaves as a "decoy" if it is present when biomphalaria pfeifferi is exposed to the miracidia of s. mansoni, and that the continued presence of h. duryi in the aquar ... | 1976 | 1086732 |
| 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 |
| [remarks on the ecological adaptation of the snail aquatic fauna in saline medium of the dallol ponds. (republique du niger) (author's transl)]. | human vesical and intestinal bilharziasis, bovine fasciolosis and paramphistomosis, equine gastrodiscosis and ovine carmyeriosis, are frequent in the dallols'region, (12 degrees - 13 degrees 30 n. lat. ; 3 degrees e. long.), republique du niger, africa. dallols are fossil valleys pouring water from late saharian lakes. they are also tributaries of the niger river. during the dry season, they become dry and many residual ponds of varied dimensions; from tens feet to one or two miles long, are lyi ... | 1975 | 1221913 |
| the effect of exposure to selected numbers of schistosoma mansoni miracidia on survival of cohorts of biomphalaria pfeifferi. | cohorts of 25 specimens of biomphalaria pfeifferi were each exposed to batches of one, three, five, seven and 10 schistosoma mansoni miracidia per snail. the effect on survival was evaluated by calculating the weekly per capita mortality rates and the mean life expectancy of the exposed snails. no statistically significant difference could be demonstrated between the mean per capita mortality rates of cohorts exposed to one and three miracidia per snail. likewise there was no significant differe ... | 1992 | 1288439 |
| predation of biomphalaria and non-target molluscs by the crayfish procambarus clarkii: implications for the biological control of schistosomiasis. | the north american crayfish procambarus clarkii was examined under laboratory conditions for its ability to prey on biomphalaria pfeifferi and b. glabrata, molluscan intermediate hosts of human schistosomiasis, and other, non-target gastropod species. both male and female adult crayfish significantly reduced survival of neonate snails, even though alternative animal and plant foods were both available. in subsequent experiments, no differences in snail consumption were detected, for either adult ... | 1992 | 1304709 |
| does the snail melanoides tuberculata have a role in biological control of biomphalaria pfeifferi and other medically important african pulmonates? | | 1992 | 1417214 |
| [complement to the epidemiologic study of the focus of schistosoma mansoni bilharziasis in kara (northern togo)]. | the present study on the focus of schistosomiasis mansoni of kara (northern togo) complements a report already published in the bulletin de la société de pathologie exotique in 1988 (9). the following results were obtained through different experiments carried out with snails collected in kara. according to the season, 3 to 15% of the biomphalaria pfeifferi studied, were infected. the maximal release of cercariae was observed between 11 am and 1 pm. the survival of cercariae and their ability to ... | 1992 | 1422275 |
| human helminthosis in a rural community of plateau state, nigeria. | urine and faecal samples were obtained from 1,517 people in fier, a typical rural village in plateau state, nigeria, for a parasitological survey among the population. 643 (42.39%) persons were found to be infected with altogether 9 helminths, namely: ascaris lumbricoides, hookworm, taenia sp., trichuris trichiura, enterobius vermicularis, schistosoma mansoni, s. haematobium, hymenolepis nana and strongyloides stercoralis. age and religion as opposed to sex, type of sewage system, and type of ho ... | 1992 | 1456465 |
| a preliminary study on intermediate snail hosts of schistosomes in river enyau, arua district, uganda. | a total of 1260 snail intermediate hosts of both schistosoma mansoni and schistosoma haemotobium were collected along the non-seasonal river enyau which lies half a kilometre west of arua, a north-western uganda town. the snails collected were biomphalaria pfeifferi 709: biomphalaria choanomphala 457, bulinus bulinus tropicus 94. these were screened for cercariae shedding and 25 b. pfeifferi and 12 b. choanomphalal shed mammalian cercaricae while none of the bulinus (bulinus) tropicus shed any c ... | 1992 | 1505417 |
| a further model for temporal patterns in the epidemiology of schistosome infections of snails. | the prevalence of schistosoma mansoni infections of biomphalaria pfeifferi shows seasonal variation. field data from zimbabwe show annual ranges from 0 to 7%. in this paper a mathematical model of b. pfeifferi population dynamics and s. mansoni epidemiology is used as a framework for analysis of these patterns. snail fecundity is a function of snail age and of temperature, and is apparently affected by other seasonal factors. the pre-patent period is dependent on temperature. infection affects s ... | 1992 | 1641244 |
| the epidemiology of schistosomiasis in burundi and its consequences for control. | this paper summarizes the results of a series of studies on the epidemiology, morbidity and transmission of schistosoma mansoni in burundi, and discusses their consequences for control. the main endemic area is the imbo lowland, consisting of the rusizi plain, the urban focus of bujumbura, and the shores of lake tanganyika; a small, new focus was discovered in the highlands, around lake cohoha. distribution studies on 5-10% population samples with duplicate 28 mg kato smears in these 4 foci show ... | 1991 | 1780993 |
| laboratory evaluation of b-2 as a molluscicide in the control of the snail intermediate hosts of schistosomiasis in south africa. | there is a continuous need for the development and evaluation of new, inexpensive but highly effective molluscides for the control of freshwater snails acting as intermediate hosts of schistomiasis. for this reason b-2 (hokko chemical industry co. ltd, japan), also called phebrol (sodium 2,5-dichloro-4-bromophenol), was evaluated in our laboratory as a candidate molluscicide for the control of freshwater snails in south africa. bulinus africanus and biomphalaria pfeifferi, intermediate hosts of ... | 1991 | 1796888 |
| [epidemiology of intestinal schistosomiasis with schistosoma mansoni in richard-toll (delta of the senegal river). malacological study]. | a recent outbreak of intestinal schistosomiasis (1989) has been reported in richard-toll (delta of senegal river) with a global prevalence of 43%. a malacological survey has been carried in order to study, the density of biomphalaria pfeifferi the intermediate hosts, their distribution and rate of infection, and to identify the transmission sites. ten districts have been selected. the snails have been collected in the different water points of these localities which are the river, the taouey mar ... | 1991 | 1914048 |
| control of schistosome-transmitting snails in kenya by the north american crayfish procambarus clarkii. | snail-transmitted trematode parasites such as schistosomes and liver flukes assume considerable medical and veterinary significance in tropical africa. we have observed a strong negative association between the presence of medically important pulmonate snails and the crayfish procambarus clarkii in freshwater habitats in kenya. this crayfish, introduced into kenya around 1970, readily consumes these snails in the laboratory. field enclosure experiments indicate that crayfish exert a significant ... | 1991 | 1928568 |
| the molluscicidal properties of apodytes dimidiata subsp. dimidiata (icacinaceae). | the molluscicidal and piscicidal activity of extracts from the leaves, berries and bark of the tree apodytes dimidiata were evaluated experimentally. the leaves were highly toxic to both bulinus africanus and biomphalaria pfeifferi, the intermediate host snails of schistosoma spp. b. pfeifferi profusely exuded mucus which appeared to render some protection against the toxic substance(s) of the plant but did not prevent their eventual demise. the lc10 after one-hour exposures of fish (oreochromis ... | 1991 | 2051521 |
| a parasitological and malacological survey of schistosomiasis mansoni in the beles valley, northwestern ethiopia. | a survey of schistosomiasis mansoni infection was conducted in an area of northwestern ethiopia which has been targeted for an irrigation project. the proximity of settlements to water-bodies infested with biomphalaria pfeifferi, and used extensively for bathing and domestic purposes, indicated that the potential for transmission is high. snails shedding s. mansoni cercariae were found in two localities. stool specimens from a total of 7517 persons were examined, including specimens from 4915 ch ... | 1990 | 2106038 |
| schistosomiasis on the entebbe peninsula. | a comparative study of the prevalence of schistosoma mansoni and their intermediate host in the fishing villages of nakiwogo and kigungu is reported. a total of 520 inhabitants from the two villages were examined for schistosoma mansoni. their age varied from 4 to 40 and the infection was found to be higher at nakiwogo 95(36.6%) than at kigungu 40(15.4%). the snails collected were 1,345 biomphalaria choanomphala, 237 biomphalaria pfeifferi, 180 bulinus (bulinus) tropicus, 56 bulinus (physopsis) ... | 1990 | 2112995 |
| susceptibility of biomphalaria pfeifferi from amibara irrigation scheme to schistosoma mansoni parasites from adua and gursume, ethiopia. | a laboratory based susceptibility study was carried out on the snail biomphalaria pfeifferi from canal habitats of the amibara irrigation scheme (awash valley) to schistosoma mansoni parasites from adua (northern) and gursume (eastern) ethiopia. the objective of the study was to investigate the potential role of the snail in the transmission of s. mansoni in the irrigation network of amibara. thirty seven (74%) of the 50 snails and 55 (73.3%) of the 75 snails exposed to adua and gursume parasite ... | 1990 | 2120052 |
| outbreak of intestinal schistosomiasis in the senegal river basin. | intestinal schistosomiasis has never been reported in the delta of the senegal river basin. a year and a half after the diama dam became operational, a first case of schistosoma mansoni infection was detected at richard-toll. in 1988 and 1989, 1,935 stool examinations out of a sample of 3,926 were found positive for s. mansoni. the progression of positive stool samples is rapid in all neighbourhoods of richard-toll: 1.9% positive examinations in 1988 compared to 71.5% in the last quarter of 1989 ... | 1990 | 2122819 |
| interaction in the laboratory between helisoma duryi, a possible competitor snail, and biomphalaria pfeifferi, snail intermediate host of schistosoma mansoni. | the planorbid snail, helisoma duryi, has been proposed as a possible biocontrol agent against the intermediate host snails of schistosomiasis. in an attempt to evaluate the possible effect of interference between h. duryi and biomphalaria pfeifferi, life-tables were compiled for these two snail species maintained both in the presence of each other and separately. the calculated population parameters indicated that h. duryi had a higher innate capacity of increase, net reproduction rate and finit ... | 1990 | 2124439 |
| human schistosomiasis in cameroon. ii. distribution of the snail hosts. | a nationwide survey for snail hosts of human schistosomes was carried out in cameroon between 1985 and 1988. in total, 668 sites at 432 locations were sampled. in the arid, northern half of the country (tropical climatic zone), where both intestinal and urinary schistosomiasis are hyperendemic, biomphalaria pfeifferi was the only schistosoma mansoni host and bulinus globusus and b. senegalensis the most common s. haematobium hosts. in that region, these snails occurred almost exclusively in temp ... | 1990 | 2372088 |
| helminth and snail survey in harerge region of ethiopia with special reference to schistosomiasis. | 2300 persons from 25 communities in harerge administrative region were examined for intestinal helminths. the overall prevalence rates were: schistosoma mansoni 19.4%, ascaris lumbricoides 13.4%, trichuris trichiura 7.9%, and taenia species 5.8%. other parasites found in less than 3% included: hymenolepis nana, hymenolepis diminuta, enterobius vermicularis, strongyloides stercoralis and hookworms. three age groups, 5-9, 10-14, and 15-19 years, had approximately similar prevalence (34.9-38.8%), b ... | 1989 | 2496975 |
| intestinal helminths in akaki town, with special emphasis on the epidemiology of schistosoma mansoni. | two thousand, three hundred and nine stool specimens from about 5% of the residents of akaki were examined by kato thick smear technique for helminthic infections. the prevalence of various parasites was as follows: schistosoma mansoni, 1.5%; ascaris lumbricoides, 40.7%; trichuris trichiura, 27.5%, enterobius vermicularis, 2.2%; taenia saginata, 3.2%; and hymenolepis nana, 0.6%. infected biomphalaria pfeifferi snails were collected from the fanta stream, and 12% of the residents along the stream ... | 1989 | 2513182 |
| 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 |
| a comparative evaluation of snail sampling and cercariometry to detect schistosoma mansoni transmission in a large-scale, longitudinal field-study in machakos, kenya. | in an operational schistosoma mansoni field-study in an area about 20 km 2 (population approximately 8000), transmission detection by simple snail sampling was compared with cercariometry. between 1985 and 1987, 62 field sites were sampled at fortnightly intervals. of a total of 2758 field observations, 89.8% gave full snail data; 64.4% full cercarial data; and 61.7% complete data for both methods. the complete data sets showed significant but not strong correlations between biomphalaria pfeiffe ... | 1989 | 2608312 |
| 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 |
| identification of snails infected with schistosomes by elisa employing monoclonal antibodies: schistosoma mansoni in laboratory snails (biomphalaria glabrata) and in field snails (biomphalaria pfeifferi) from kenya. | an enzyme-linked immunosorbent assay (elisa) employing monoclonal antibodies was used for detecting schistosoma mansoni antigens in hemolymph of laboratory snails (biomphalaria glabrata) in kenya. infected laboratory snails shedding cercariae were differentially identified by elisa from uninfected snails with 100% sensitivity and specificity. prepatent infections were detected by elisa from 2 weeks after exposure to miracidia. thus, elisa revealed infection 3 weeks before maximal patency was rea ... | 1989 | 2742038 |
| 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 |
| bilharzia risk in lichtenburg, tvl. | the discovery of biomphalaria pfeifferi, the intermediate host of schistosoma mansoni, in the rsa in the recreational area of lichtenburg prompted an investigation to assess the bilharzia risk posed by their presence. localized populations of b. pfeifferi were found in the recreational area and in the adjoining game breeding farm. the population of downstream areas by the snails appears to be prevented by the water quality. it is proposed that the large populations of aquatic birds in the game b ... | 1986 | 3083518 |
| 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 |
| 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 |
| 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 |
| [effect of the hybridization of schistosoma mansoni strains on the degree of compatibility of the parthenitae with their mollusk intermediate hosts]. | after-effects of hybridization of s. mansoni strains, having biomphalaria pfeifferi as an intermediate host, have been revealed for the first time. the crossing of two african strains (malarial-m and guinea-g), which have different compatibility rates with their specific intermediate hosts, has shown that hybrids display a higher virulence in respect to molluscs-hosts than maternal strains. the compatibility rate of the first generation hybrids with b. pfeifferi decreased, the breachs in the com ... | 1988 | 3357699 |
| preliminary evaluation of some wild and cultivated plants for snail control in machakos district, kenya. | fifty local medicinal, agricultural and wild growing deciduous plants, representing 49 species, 46 genera and 22 families, were screened as water extracts at 1:1000 concentration for molluscicidal activity against biomphalaria pfeifferi in machakos district, kenya. forty-seven of the 50 (94%) plants and 106 of the 134 (79%) plant materials (roots, stems, leaves, fruits, flowers and seeds) were molluscicidal. the leaves of pappea capensis (sapindaceae), steganotaenia araliacea (umbelliferae), zor ... | 1987 | 3656497 |
| topographic shifting of primary sporocysts of schistosoma mansoni in biomphalaria pfeifferi as a result of coinfection with echinostoma caproni. | | 1986 | 3782852 |
| [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 |
| focality and seasonality of schistosoma mansoni transmission in the gezira irrigated area, sudan. | in the gezira irrigated area of central sudan, transmission of schistosoma mansoni was shown to be geographically focal, being concentrated near villages and small settlements. in a study during 1981 and 1982 of the entire area around a typical gezira village almost 90% of the biomphalaria pfeifferi snails carrying schistosome infections were found in one minor canal near the village. sites near smaller settlements some distance from the minor canals yielded few infected snails. the factors whic ... | 1985 | 4032530 |
| snails and aquatic vegetation in gezira irrigation canals. | all 38 minor canals in a limited area of the gezira irrigated area were surveyed four times over a 2-year period to determine the aquatic and semi-aquatic vegetation types found and their distribution. a more detailed 2-year study of the correlation between snail density and aquatic vegetation was carried out in 18 of these canals. a total of 22 different species of weed were recorded, with floating and submerged weeds being more widespread and dense in the clear, slow-moving water at the end of ... | 1985 | 4032532 |
| schistosoma mansoni (gezira) infection in biomphalaria pfeifferi snails from gezira and jebel marra. | the comparative susceptibility of biomphalaria snails from gezira and jebel marra to s. mansoni (gezira) was investigated. groups of laboratory-bred snails from the two localities were exposed to 0, 1, 2, 3 and 4 miracidia. the growth rate of the snails was followed over the experimental period by measuring the snails' shell size. sub-groups of infected snails were examined for daughter sporocyst counts by crushing of the snails. other groups of exposed snails were maintained until cercariae wer ... | 1985 | 4032534 |
| sharing of cercarienhüllen reaktion antigens between schistosoma mansoni cercariae and adults and uninfected biomphalaria pfeifferi. | | 1974 | 4206328 |
| effect of a control programme on transmission of schistosoma mansoni on an irrigated estate in tanzania. | three methods were used to measure the level of transmission of infections of schistosoma mansoni on an irrigated sugar estate in northern tanzania. the studies were carried out over a period of 3 years, during a programme for the control of the host snail biomphalaria pfeifferi. during the second and third years a mass diagnosis and treatment campaign against the infection was also carried out. examinations for infection were made in newly employed subjects on arrival and after 6 and 12 months. ... | 1972 | 4539820 |
| the effect of a control programme against schistosoma mansoni on the prevalence and intensity of infection on an irrigated sugar estate in northern tanzania. | on an irrigated sugar estate in northern tanzania a control programme against schistosoma mansoni was carried out during 1968-70. through the routine use of molluscicides, the population of biomphalaria pfeifferi snails was kept at a greatly reduced level. concurrently a mass campaign was carried out to detect residents who were infected with s. mansoni so that they might be treated. the effect of these measures on the overall prevalence of the disease was measured by random studies before and a ... | 1972 | 4540677 |
| seasonal variations of cercarial output from biomphalaria pfeifferi and bulinus (physopsis) globosus in a natural habitat in southern rhodesia. | | 1965 | 5294598 |
| molluscicidal properties of acacia nilotica subspecies tomentosa and astringens i. | the acetone, alcohol and aqueous extracts of the fruits and stem bark of acacia nilotica subspp. tomentosa, astringens and nilotica showed molluscicidal activity against the two snail species which transmit schistosomiasis in the sudan. being effective against bulinus truncatus and biomphalaria pfeifferi, extracts of the acacia nilotica subspecies may be promising vegetable molluscicides. | 1985 | 4068076 |
| molluscicidal properties of acacia nilotica subspecies tomentosa and astringens ii. | a screening programme of plants rich in plant phenolic tannins for molluscicidal activity against the snail species bulinus truncatus and biomphalaria pfeifferi is now under way. the spray-dried powders of the pods and stem bark of acacia nilotica subspp. nilotica, tomentosa and astringens prove to be promising vegetable molluscicides. | 1985 | 4068077 |
| trials with n-tritylmorpholine (shell wl 8008) as a molluscicide in southern rhodesia. | in the course of research into the effectiveness of new molluscicides for bilharziasis control, a recently developed compound, shell wl 8008 (n-tritylmorpholine), has been tested in southern rhodesia, both in the laboratory and in the field. it is highly toxic to bulinus (physopsis) globosus, biomphalaria pfeifferi and lymnaea natalensis, all of which succumbed to the compound at a concentration of 1.0 ppm in a contact time of only 15 minutes. in experiments in reservoirs and natural watercourse ... | 1966 | 5297004 |
| field trials to evaluate the effectiveness of the molluscicide n-tritylmorpholine in irrigation systems. | in field trials with the molluscicide n-tritylmorpholine (frescon, wl 8008), a prolonged low-dosage technique has been developed for use in irrigation systems. in tanzania a dose of 0.025 ppm applied for 30 days to the headworks of a 5000-acre (2025-ha) irrigation system gave effective control of biomphalaria pfeifferi, the snail host of schistosoma mansoni, for a period of 3-4 months. this was comparable to the effectiveness of other molluscicides and other dosage regimes but the technique had ... | 1967 | 5300051 |
| attempts to eradicate snails from impounded water by the use of n-tritylmorpholine. | this paper records attempts to overcome the problems of using a powerful but non-ovicidal molluscicide (n-tritylmorpholine) in eradicating snails from a dam by treating the water twice in 14 days. the first treatment was aimed at the existing snail population and the second at snails hatched from eggs that survived the first application. at each treatment an over-all concentration of 0.25 ppm was applied by spraying a 16% emulsifiable concentrate of n-tritylmorpholine from shore and boat to the ... | 1970 | 5310953 |
| the development of snail control methods on an irrigated sugar-cane estate in northern tanzania. | in an attempt to prevent the transmission of schistosoma mansoni on an irrigated sugar-cane estate, molluscicide experiments were carried out to find the optimum methods for controlling the intermediate-host snails, biomphalaria pfeifferi. the ease of application of n-tritylmorpholine led to its adoption as the molluscicide of choice for the two separate irrigation systems on the estate. experiments on the frequency and duration of molluscicide treatments were carried out, and from these it was ... | 1970 | 5310954 |
| the influence of temperature on the biology of biomphalaria pfeifferi (krauss), an intermediate host of schistosoma mansoni. | | 1966 | 5960099 |
| the influence of infection with schistosoma mansoni on the growth rate and reproduction of biomphalaria pfeifferi. | | 1966 | 6006924 |
| 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 |
| elimination of biomphalaria pfeifferi, bulinus tropicus and lymnaea natalensis by the ampullarid snail, marisa cornuarietis, in a man-made dam in northern tanzania. | marisa cornuarietis is a well known ampullarid competitor/predator of biomphalaria glabrata in puerto rico. for the first time in africa a flourishing population of marisa has been established in a small, permanent, man-made dam at kisangara, near moshi, tanzania. prior to the release of m. cornuarietis in june 1977, this dam supported thriving populations of the pulmonate snail hosts biomphalaria pfeifferi and lymnaea natalensis; bulinus tropicus and the melaniid melanoides tuberculata were als ... | 1982 | 6122367 |
| 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 |
| distribution of helisoma duryi, an introduced competitor of intermediate hosts of schistosomiasis, in an irrigation scheme in northern tanzania. | helisoma duryi is a planorbid snail, which has been suggested as biological control agent against the intermediate hosts of schistosomiasis. this snail species has been present in a sugar estate in northern tanzania since 1972. in january 1981 a snail survey was done in this area in order to determine the distribution and abundance of h. duryi relative to other freshwater snail species. the distribution of h. duryi was found to be restricted to a few drains, while biomphalaria pfeifferi, bulinus ... | 1983 | 6138978 |
| biomphalaria pfeifferi in eastern senegal region, department of kédougou, republic of senagal, west africa. | | 1984 | 6485072 |
| studies on schistosomiasis in taiz province, yemen arab republic. | infection with both urinary and intestinal schistosomiasis is prevalent with patchy distribution in taiz province, southwest yemen arab republic. schistosoma haematobium with a prevalence as high as 90% was found in the western, southern, and northern parts of the province. among school children the overall prevalence was 37%. infection rates did not differ significantly among various age and sex groups. three species of bulinus--b. beccarii, b. truncatus, and b. wrighti--have been found in the ... | 1983 | 6625057 |
| [effects of hyperinfestations by echinostoma togoensis jourdane and kulo, 1981 on growth and survival of biomphalaria pfeifferi snails]. | a study of larval development of echinostoma togoensis in biomphalaria pfeifferi under hyperinfestation conditions (number of miradia equal to or greater than 10) showed the following characteristics: --exposure to e. togoensis resulted in considerably increased growth in relation to the miracidial exposure dose; --exposure to e. togoensis resulted in considerably increased mortality of b. pfeifferi. a population of planorbs infested with 20 miracidia is completely eliminated 6 weeks after expos ... | 1983 | 6625464 |
| the influence of fluctuating above-optimal temperature regimes on the fecundity of biomphalaria pfeifferi (mollusca: planorbidae). | biomphalaria pfeifferi of different sizes were subjected to fluctuating temperature regimes incorporating quantities of above-optimal heat ranging from approximately 2 to 75 degree hours greater than 27 degrees c per day. fecundity over this range was found to be similar from 2 to 45 deg.h. greater than 27 degrees c/day but above this level egg production fell sharply. histological examination of the gonads of experimental and control snails showed that not only was gametogenesis retarded above ... | 1984 | 6710576 |
| 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 |
| the effect of varying the number of schistosoma mansoni miracidia on the reproduction and survival of biomphalaria pfeifferi. | | 1981 | 6894305 |
| swamp rice development, schistosomiasis, and onchocerciasis in southeast sierra leone. | seventy-four villages in eastern sierra leone, west africa, many having a recently developed rice swamp, were surveyed for the presence of schistosomiasis and onchocerciasis, and their vectors. prevalence rates for schistosoma haematobium and s. mansoni were low, although the infections were widespread. there is some evidence that s. mansoni is extending its range in sierra leone although this is problematical because of the apparent absence of biomphalaria pfeifferi, the recognized snail vector ... | 1982 | 7081542 |
| [an epidemiological study of intestinal bilharziasis and roundworm infections in bafia (cameroon)]. | the prevalence of intestinal helminthiasis is measured by means of stool examinations. in bafia eggs are passed in the feces of 69.1% of the inhabitants for ascaris lumbricoides, 70.1 % for trichuris trichiura, 59.6 % for necator americanus and 14.8% for enterobius vermicularis. a small focus of intestinal bilharziasis exists in bafia and eggs of schistosoma mansoni are found in the feces of 18.6% of the persons studied. biomphalaria pfeifferi is the intermediate host of the parasite and transmi ... | 1982 | 7105280 |
| case reports on control of biomphalaria pfeifferi snails with phytolacca dodecandra berries. | three case reports are given on the control of biomphalaria pfeifferi, the intermediate snailhost of schistosoma mansoni, occurring in the highlands of ethiopia. control was effected by applying phytolacca dodecandra berry suspensions on two different rivers. a method of application by siphoning the suspension into the river is described. both rivers were densely populated with b. pfeifferi, but with only 2.5-3.5 kg of berries their presence could be reduced to almost nil. except for fish, the w ... | 1982 | 7123645 |
| [perspectives of the use of echinostoma togoensis jourdane et kulo, 1981 for biological control of intestinal schistosomiasis in africa]. | a study of the experimental development of e. togoensis jourdane et kulo, 1981 in its successive hosts has allowed us to show that this species combines several characteristics considered to be essential with a view to biological control of intestinal schistosomiasis: --a complete and permanent sterilizing effect of biomphalaria pfeifferi; --a pathogenicity with respect to the mollusc in infestations with more than 5 miracidia; --a very clear dominance of intramolluscal stages of schistosoma man ... | 1982 | 7181376 |
| [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 |
| distribution in kenya of intermediate hosts of schistosoma. | a major factor in the geographical distribution of endemic schistosomiasis in kenya is the discontinuous distribution of intermediate hosts. biomphalaria pfeifferi is the main transmitter of s. mansoni and is found in the altitude zone 300-2,300 m; its absence from the costal region results in the absence of endemic schistosomiasis mansoni amongst the large human population in the coastal region. snails belonging to the bulinus africanus group appear to be responsible for all transmission of s. ... | 1981 | 7281220 |
| [recent detection of a schistosomiasis focus with s. mansoni in a high region of rwanda (author's transl)]. | a schistosomiasis focus infested by s. mansoni has been recently detected in the north-western region of rwanda (average altitude 1800 m). the soil is rich. the small homesteads are scattered. only a part of the population, living on the bank of the lakes bulera and ruhondo, is mainly concerned with fishery. the endemy is not negligible, in spite of unfavourable climatic conditions, and of lakes water temperature never reaching 25 degrees c. but all other conditions required for the growth and t ... | 1981 | 7339423 |
| [study of the distribution of schistosomiasis mollusks intermediate hosts in west africa. first results (author's transl)]. | during 18 surveys carried out in 29 regions of 6 west african countries (benin, ivory coast, upper volta, mali, niger and togo), one species of biomphalaria (biomphalaria pfeifferi) and six species of bulinus (bulinus truncatus rohlfsi, b. globosus, b. jousseaumei, b. umbilicatus, b. senegalensis and b. forskalii) were collected. first indications of the distribution of these species demonstrated: the presence of 3 principal species (b. pfeifferi, b. globosus and b. truncatus rohlfsi); the absen ... | 1980 | 7366365 |
| the development of daughter sporocysts inside the mother sporocyst of schistosoma mansoni with special reference to the ultrastructure of the body wall. | the development of the mother sporocyst and the differentiation of the daughter sporocyst of schistosoma mansoni in biomphalaria pfeifferi are described. the tegumental structure of the mother sporocyst, consisting of an outer layer connected to internally situated nucleated cell bodies, forms extensions which enwrap the germinal cells. the parenchyma cells, in which the germinal cells were embedded before, degenerate. when daughter sporocyst embryos develop from germinal cells they are envelope ... | 1980 | 7368772 |
| short report: diminished susceptibility to praziquantel in a senegal isolate of schistosoma mansoni. | there is a recent report of low efficacy of praziquantel (pzq) treatment of human schistosomiasis in a new schistosoma mansoni focus in northern senegal. biomphalaria pfeifferi snails with patent infections were collected from the area of the focus and transported to the united kingdom. groups of mice were infected with cercariae from this senegalese isolate, or with laboratory-maintained kenyan or puerto rican isolates. in two separate experiments, pzq was less effective against the parasite fr ... | 1995 | 7625534 |
| 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 |
| observations on the effects of different chemotherapy strategies on the transmission of schistosoma mansoni in machakos district, kenya, measured by long-term snail sampling and cercariometry. | transmission of schistosoma mansoni was monitored by routine snail sampling for biomphalaria pfeifferi and by supplementary cercariometric measurements in 4 neighbouring study areas in machakos district, kenya. after 1 year, extensive, population-based chemotherapy with a single dose of praziquantel was given in 3 areas, but only minimal treatment in the fourth. in the year preceding treatment, seasonal transmission of s. mansoni and other non-human trematodes occurred in all 4 areas, despite so ... | 1994 | 7800412 |
| 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 |
| intestinal helminthic infections in the southern rift valley of ethiopia with special reference to schistosomiasis. | nineteen communities located in the southern part of the ethiopian rift valley were surveyed for s. mansoni infection and other helminth parasites of man. s. mansoni infected individuals were recorded in 11 communities and human prevalence reached more than 10% in 4 of them. the snail intermediate hosts were biomphalaria pfeifferi in the lower omo river basin and b. sudanica in the rift valley lakes. other parasites encountered included a. lumbricoides (11.2%), t. trichiura (10.3%), hookworms (2 ... | 1994 | 7828499 |
| the status of schistosoma mansoni and snail hosts in tigray and northern wello regions, northern ethiopia. | a survey of schistosoma mansoni infection and snail hosts was carried out in 1992 in six accessible schools and 11 water bodies respectively. five to ten per cent of the students were randomly selected for stool examination by the ritichie's method. in adwa town, however, stools of 100 students out of the 199 selected were re-examined by kato's method to assess intensity of infection. results of stools examined by ritichie's method showed that s. mansoni positive patients were present in four ou ... | 1994 | 7835353 |
| 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 ... | 1994 | 7886759 |
| 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 |
| 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 |
| 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 |
| the effect of exposure to schistosoma mansoni on mortality rates of cohorts of different ages of biomphalaria pfeifferi. | the effect of exposure to miracidia of schistosoma mansoni sambon on mortality rates of five different age-groups of biomphalaria pfeifferi (krauss) was investigated under carefully controlled conditions in the laboratory. the per capita mortality rates were determined for each age-group and the mean life expectancy and mean snail mortalities per week calculated. it was demonstrated that the cohorts of snails exposed to three miracidia per snail at an age of one week suffered the highest mortali ... | 1993 | 8325569 |
| schistosoma mansoni in migrants entering south africa from moçambique--a threat to public health in north-eastern kwazulu-natal? | to identify possible public health consequences of schistosoma mansoni infections in migrants entering north-eastern kwazulu-natal and mpumalanga and northern province from southern moçambique. | 1996 | 8693370 |
| [survival of bulinus truncatus and biomphalaria pfeifferi in sewer water purified in stabilization ponds in a sudanese-saharan zone]. | in subsaharan africa wastewater purification to protect the health of the population could create stagnate water reservoirs for parasitic vectors such as snails which are intermediate hosts of bilharzia. laboratory studies of the survival of bulinus truncatus, an intermediate host of schistosoma haematobium, and biomphalaria pfeifferi, an intermediate host of schistosoma mansoni, in waste water purified in stabilization ponds showed that biomphalaria pfeifferi thrives to dirty water (60 mg/l < o ... | 1996 | 8767791 |
| 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 |