Publications

the evolution of phally polymorphism in bulinus truncatus (gastropoda, planorbidae): the cost of male function analysed through life-history traits and sex allocation.	in the hermaphrodite freshwater snail bulinus truncatus, two sexual morphs, euphallic (regular hermaphrodites) and aphallic individuals without a male copulatory organ, co-occur at various ratios in natural populations. both aphallic and euphallic individuals can reproduce by selfing, but when outcrossing aphallic individuals can only play the female role. a comparison of life-history traits and sex allocation in these two forms provides the opportunity to investigate the evolution and maintenan ...	1996	28307445
assessing the prevalence of urogenital schistosomaisis and transmission risk factors amongst school-aged children around mapé dam ecological suburbs in malantouen district, cameroon.	urogenital schistosomiasis is a parasitic infection of public health importance that affects over 112 million people worldwide. the study aimed at assessing the urogenital schistosomiasis prevalence and risk factors of transmission around mape dam suburds in malantouen district, west, cameroon.	2017	28260525
biological control of snail hosts transmitting schistosomiasis by the water bug, sphaerodema urinator.	the water bug, sphaerodema urinator (hemiptera : belostomatidae), shares the same habitat of the freshwater snails in ponds, lakes, and streams. studies conducted in lakes show that fish and crayfish predators play an important role in determining the abundance of freshwater snails. in contrast, shallow ponds and marches often lack fish and crayfish but have abundant insect predators. this study has been carried out to evaluate the predatory potential of s. urinator adult on two freshwater snail ...	2017	28204958
digenetic larvae in schistosome snails from el fayoum, egypt with detection of schistosoma mansoni in the snail by pcr.	the present study aims to detect the digenetic larvae infections in bulinus truncatus and biomphalaria alexandrina snails and also pcr detection of schistosoma mansoni infection. the snails were collected from different branches of yousef canal and their derivatives in el fayoum governorate. the snails were investigated for infection through induction of cercarial shedding by exposure to light and crushing of the snails. the shed cercariae were s. mansoni, pharyngeate longifurcate type i and pha ...	2016	27605774
elimination of urogenital schistosomiasis in iran: past history and the current situation.	in recent years, through a national programme for schistosomiasis control, this infection has been eliminated from iran. the aim of this study was to report the process of significant decrease of urogenital schistosomiasis in southwestern iran. during national programme surveillance for urogenital schistosomiasis control which was implemented by centres for disease control and prevention (cdc) of khuzestan province from 1975 to 2013, more than 1·3 million urine samples were taken from inhabitant ...	2016	27279000
outbreak of urogenital schistosomiasis in corsica (france): an epidemiological case study.	schistosomiasis is a snail-borne parasitic disease endemic in several tropical and subtropical countries. however, in the summer of 2013, an unexpected outbreak of urogenital schistosomiasis occurred in corsica, with more than 120 local people or tourists infected. we used a multidisciplinary approach to investigate the epidemiology of urogenital schistosomiasis in corsica, aiming to elucidate the origin of the outbreak.	2016	27197551
[epidemiology of schistosomiasis in the periurban area of sotuba, 10 years mass treatment began in mali].	the objective of this work was to describe the epidemiology of schistosomiasis 10 years after mass administration of praziquantel began in sotuba, mali.	2017	26986093
types of trematodes infecting freshwater snails found in irrigation canals in the east nile locality, khartoum, sudan.	the planorbid freshwater snails of the two genera, biomphalaria and bulinus -have been vigorously studied due to the role they play as intermediate hosts of schistosomiasis. in sudan specifically, most studies have focused on the chemical and ecological control of the two genera, but few studies have looked at their biological control. this study explored the coexistence of other species of freshwater snails and the two genera along with their trematode infections in relation to a number of envi ...	2016	26915911
schistosomiasis screening of travelers to corsica, france.		2016	26691533
schistosomiasis screening of travelers to corsica, france.		2016	26691318
high levels of urinary schistosomiasis among children in bunuso, a rural community in ghana: an urgent call for increased surveillance and control programs.	we investigated the occurrence of urinary schistosomiasis and estimated predictors for risk of infection among children in the bunuso community of ashanti region of ghana, west africa. the cross-sectional survey was conducted between june and december 2009. information was obtained on socio-demographic characteristics, schistosomiasis symptoms and other risk factors through interviews and questionnaires. urine samples were analysed for schistosoma haematobium ova using centrifugation and sedimen ...	2015	26688622
infection with schistosome parasites in snails leads to increased predation by prawns: implications for human schistosomiasis control.	schistosomiasis - a parasitic disease that affects over 200 million people across the globe - is primarily transmitted between human definitive hosts and snail intermediate hosts. to reduce schistosomiasis transmission, some have advocated disrupting the schistosome life cycle through biological control of snails, achieved by boosting the abundance of snails' natural predators. but little is known about the effect of parasitic infection on predator-prey interactions, especially in the case of sc ...	2015	26677260
local and international implications of schistosomiasis acquired in corsica, france.	we report 11 cases of schistosomiasis in international travelers who had bathed in rivers in corsica, france, during 2012-2014. the infections were diagnosed in 2014 and reported to the geosentinel surveillance network and european travel medicine network. travelers can be sentinels for emerging infections; thus, this situation warrants a concerted human and veterinary epidemiologic response.	2015	26401954
retracted: glyphosate herbicide induces genotoxic effect and physiological disturbances in bulinus truncatus snails.	herbicides are being used in agriculture for controlling noxious weed. glyphosate is a herbicide that is widely applied to cereal crops in egypt and is used in controlling a very broad spectrum of weeds. the present study was designed to investigate the response of the snail bulinus truncatus as a bioindicator for physiological and molecular aspects of b. truncatus snails after exposure to sublethal concentrations of glyphosate for two weeks. in treating snails, glucose concentration (gl) in the ...	2015	26267049
urban schistosomiasis and associated determinant factors among school children in bamako, mali, west africa.	schistosomiasis is classically described as a rural disease that occurs in areas with poor sanitary conditions. however, over recent decades, there has been an expansion of schistosomiasis foci towards urban areas faced with a rapid and disordered urbanization. in bamako, mali, the impact of environmental change on vector-borne diseases such as schistosomiasis is not well known. this study sought to identify the presence of schistosomiasis transmission hotspots in bamako. using this perspective, ...	2015	25973199
prevalence of schistosomiasis among patients attending qena general hospital over the years 2011 and 2012.	schistosomiasis is a public health problem in egypt. to detect the prevalence of schistosomiasis in qena governorate, 1601 urine and stool samples of patients attending qena general hospital were examined of whom 1601 patients had urinary symptoms and 893 patients had dysentery and bloody stool. sheets were filled out on each patient. also, a total of 7590 bulinus truncatus and biomphalaria alexandrina snails were collected from water bodies in qena governorate. the overall prevalence of s. haem ...	2014	25597163
cytokines and mother sporocysts in susceptible and resistant bulinus truncatus snails infected with schistosoma haematobium.	the presence of immunoreactive interleukin (il-2), interferon gamma (ifn-γ) and tumor necrosis factor alpha (tnf-α) in addition to the citation of mother sporscytes in cephalopodal musculature in the susceptible and resistance bulinus truncatus the specific intermediate host for the trematode schistosoma haematobium were investigated,. using elisa tests, results indicated that the concentration of il-2-like activity in the susceptible and resistant snails decreased significantly after infection ...	2014	25597143
the spatial and seasonal distribution of bulinus truncatus, bulinus forskalii and biomphalaria pfeifferi, the intermediate host snails of schistosomiasis, in n'djamena, chad.	there is a paucity of epidemiological and malacological data pertaining to schistosomiasis in chad. in view of a recently articulated elimination agenda, a deeper understanding of the spatio-temporal distribution of schistosomiasis intermediate host snails is pivotal. we conducted cross-sectional malacological surveys during the dry season (april/may 2013) and after the short rainy season (october 2013) in n'djamena, the capital of chad. snails were identified at the genus and species level usin ...	2014	25545929
phylogeny of seven bulinus species originating from endemic areas in three african countries, in relation to the human blood fluke schistosoma haematobium.	snails species belonging to the genus bulinus (planorbidae) serve as intermediate host for flukes belonging to the genus schistosoma (digenea, platyhelminthes). despite its importance in the transmission of these parasites, the evolutionary history of this genus is still obscure. in the present study, we used the partial mitochondrial cytochrome oxidase subunit i (cox1) gene, and the nuclear ribosomal its, 18s and 28s genes to investigate the haplotype diversity and phylogeny of seven bulinus sp ...	2014	25528261
an unusual case of hematuria in a french family returning from corsica.	urinary schistosomiasis caused by schistosoma haematobium worms is endemic to tropical regions where it is the most common cause of hematuria. however, the intermediate snail hosts, bulinus truncatus, have been described in portugal, spain, sardinia, and corsica. s. haematobium has long remained exotic to europe, however, an outbreak of urinary schistosomiasis in corsica started in 2011 with b. truncatus as the primary intermediate host. we describe the case of a 12-year-old french boy presentin ...	2015	25461660
trematode-associated morbidity and mortality of tadpoles in israel.	amphibians stand at the forefront of the global biodiversity crisis. the causes of their decline are diverse and include a rise in amphibian malformations due to various factors, especially trematode infection. however, linking amphibian mortality and morbidity with trematode infection has proven to be challenging due to the complex life cycle of the trematodes and the fact that trematodes are nonfastidious in their choice of definitive hosts. in israel, the decline in local amphibian population ...	2014	25098342
schistosoma haematobium detection in snails by drai pcr and sh110/sm-sl pcr: further evidence of the interruption of schistosomiasis transmission in morocco.	this is the first study in morocco to estimate snail infection rates at the last historic transmission sites of schistosomiasis, known to be free from new infection among humans since 2004. screening of large numbers of snails for infection is one way to confirm that schistosoma haematobium transmission has stopped and does not resurge.	2014	24962624
schistosoma haematobium infections acquired in corsica, france, august 2013.	a 12 year-old boy in germany developed urinary schistosomiasis in january 2014. he had bathed in rivers in south-eastern corsica five months earlier. before this case, human schistomiasis had not been reported on the island, although its vector, the snail bulinus truncatus, locally transmitted the zoonotic schistosoma bovis. the boy’s father excreted s. haematobium ova that were not viable; the boy’s three siblings had a positive serology against schistosomes.	2014	24925456
regulation of laboratory populations of snails (biomphalaria and bulinus spp.) by river prawns, macrobrachium spp. (decapoda, palaemonidae): implications for control of schistosomiasis.	human schistosomiasis is a common parasitic disease endemic in many tropical and subtropical countries. one barrier to achieving long-term control of this disease has been re-infection of treated patients when they swim, bathe, or wade in surface fresh water infested with snails that harbor and release larval parasites. because some snail species are obligate intermediate hosts of schistosome parasites, removing snails may reduce parasitic larvae in the water, reducing re-infection risk. here, w ...	2014	24388955
[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
efficacy of praziquantel and reinfection patterns in single and mixed infection foci for intestinal and urogenital schistosomiasis in cameroon.	the regular administration of the anthelminthic drug praziquantel (pzq) to school-aged children (and other high-risk groups) is the cornerstone of schistosomiasis control. whilst the performance of pzq against single schistosome species infections is well-known, performance against mixed species infections is less so, as are patterns of re-infection following treatment. to address this, a study using a double treatment with pzq, administered at 40 mg/kg spaced by 3 weeks, took place in two mixed ...	2013	23791803
potential use of biomphalaria alexandrina snail antigens for serodiagnosis of schistosomiasis mansoni by immunoblot analysis.	the aim of this study was to evaluate the possible use of biomphalaria alexandrina snail antigens in diagnosis of schistosomiasis mansoni using enzyme linked immunolectrotransfere blot (eitb).	2013	23682262
urinary schistosomiasis transmission in epe, an urban community of southwest nigeria.	a survey of schistosoma haematobium infection in epe, an urban community in lagos state, southwest nigeria, was carried out to ascertain the possibility that schistosomiasis, otherwise considered a rural disease, could reach urban populations.	2011	23507989
[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
development of an in vitro drug screening assay using schistosoma haematobium schistosomula.	the development of novel antischistosomal drugs is crucial, as currently no vaccine and only a single drug is available for the treatment of schistosomiasis. fast and accurate in vitro assays are urgently needed to identify new drug candidates and research efforts should include schistosoma haematobium. the aim of the present study was to develop a s. haematobium drug sensitivity assay based on newly transformed schistosomula (nts).	2012	22876861
developing species-specific primers to identify bulinus truncatus and bulinus beccari, the intermediate hosts of schistosoma haematobium in saudi arabia.	this work aimed to determine the inter- and intra-specific variations in populations of bulinus truncatus and bulinus beccari, the intermediate hosts of schistosoma haematobium in saudi arabia, and to develop species-specific primers to identify these snails as a first step in the development of multiplex pcr for simultaneously identifying the snails and diagnosing its infections in a single step. two populations of b. truncatus were collected from asser and bisha (a and b), and two b. beccari p ...	2012	22441124
habitat characteristics for different freshwater snail species as determined biologically through macroinvertebrate information.	macro-invertebrates including freshwater snails collected from 643 sites over 8 successive seasons among the river nile, branches, main canals and certain drains in eight egyptian governorates. thirteen snail species and one bivalve species were identified. the most distributed were lanistus carinatus and physa acuta while the most abundant were cleopatra bulimoides and physa acuta during the whole study. the sites that harbored each snail species in all the examined water-courses were grouped s ...	2011	22435158
docking studies of benzylidene anabaseine interactions with α7 nicotinic acetylcholine receptor (nachr) and acetylcholine binding proteins (achbps): application to the design of related α7 selective ligands.	achbps isolated from lymnaea stagnalis (ls), aplysia californica (ac) and bulinus truncatus (bt) have been extensively used as structural prototypes to understand the molecular mechanisms that underlie ligand-interactions with nachrs [1]. here, we describe docking studies on interactions of benzylidene anabaseine analogs with achbps and α7 nachr. results reveal that docking of these compounds using glide software accurately reproduces experimentally-observed binding modes of dmxba and of its act ...	2011	21986237
laboratory studies on the prevalence and cercarial rhythms of trematodes from bulinus truncatus and biomphalaria pfeifferi snails from khartoum state, sudan.	(a) to determine the natural infection rate of bulinus truncatus and biomphalaria pfeifferi snails with trematodes' cercariae. (b) to determine the emergence and rhythmicity of cercariae. (c) to elucidate the high-risk time for man and other animals to acquire infection.	2006	21748137
comparative study of the karyotypes and electrophoretic patterns of biomphalaria alexandrina and bulinus truncatus and the ova of their corresponding trematode hosts.	the karyotypes of biomphalaria alexandrina and bulinus truncatus were analyzed comparatively and classified on the basis of centromere position. the two species have the same diploid chromosome number, 2n=36. the mitotic chromosomes of b. alexandrina are organized in three groups and consist of 8 metacentric pairs, 8 submetacentric pairs and 2 subtelocentric pairs of chromosomes, while the karyotype of b. truncatus is organized in four groups and consists of 10 metacentric pairs, 4 submetacentri ...	2011	21658469
strong genetic structure in cameroonian populations of bulinus truncatus (gastropoda: planorbidae), intermediate host of schistosoma haematobium.	in order to evaluate the snail host contribution on the variability of mollusk/schistosome compatibility, the genetic structure of seven cameroonian populations of the schistosome vector, bulinus truncatus, was studied using four variable microsatellite loci. a substantial polymorphism mainly distributed among populations was observed. no heterozygous genotype was scored, confirming the high level of selfing rate occurring in b. truncatus populations. contemporaneous samples were highly and sign ...	2010	21075219
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
further observations on bulinus (bulinus) truncatus rohlfsi (clessin) in ghana: seasonal population fluctuations and biology.	bulinus (b.) truncatus rohlfsi is an important snail host of schistosoma haematobium in ghana and probably elsewhere in west africa. study of this snail in natural habitats in northern ghana has shown that the pronounced population fluctuations can be broadly related to the alternating wet and dry seasons and to any marked changes in the aquatic vegetation. an increase in snail density and reproductive activity begins during the rainy season, reaching a peak in the dry season. the onset of the c ...	1962	20604118
age-dependent susceptibilities of bulinus truncatus snails to an aqueous extract of pulicaria crispa (forssk.) oliv. (asteraceae) leaves.	this study was carried out to investigate the potential use of the herb pulicaria crispa in the biological control of different developmental stages of bulinus truncatus, a major snail intermediate host of urinary schistosomiasis. age-dependent susceptibilities of mature adult snails, immature snails, juveniles, and one-day old egg masses to aqueous extracts of pulicaria crispa leaves collected from khartoum (sudan) and riyadh (saudi arabia) was determined and compared. the results show the juve ...	2009	19842431
freshwater snails in asser region, saudi arabia with special refernce to the zoonotic trematode.	the present study gave information about the recent distribution of freshwater snails in asser region, and the current status of trematode infection specially schistosomiasis within the snails. fifteen localities were visited from septeinber 2007 to december 2008 and the collected snails were examined for the presence of trematode infection. seven species of snails were collected: biomphalaria arabica, bulinus truncatus, bulinus beccari, physa acuta, lymnaea palustris, lymnaea arabica and melano ...	2009	19795761
bidirectional introgressive hybridization between a cattle and human schistosome species.	schistosomiasis is a disease of great medical and veterinary importance in tropical and subtropical regions, caused by parasitic flatworms of the genus schistosoma (subclass digenea). following major water development schemes in the 1980s, schistosomiasis has become an important parasitic disease of children living in the senegal river basin (srb). during molecular parasitological surveys, nuclear and mitochondrial markers revealed unexpected natural interactions between a bovine and human schis ...	2009	19730700
plagiorchis elegans (trematoda) and incompatible snail hosts: implications for snail life history traits and biocontrol of human schistosomiasis.	we examined the effect of plagiorchis elegans on egg production and survival on bulinus truncatus and helisoma trivolvis trivolvis. both species are incompatible hosts for p. elegans. helisoma t. trivolvis occurs sympatrically with p. elegans; b. truncatus does not. overall, p. elegans had no effect on survivorship or egg production in h. t. trivolvis or on the survivorship of b. truncatus. its effect on egg production in b. truncatus was transitory; egg production was reduced by 50% for 5 wk fo ...	2009	19566345
helobdella nilae and alboglossiphonia conjugata leeches as biological agents for snails control.	the efficacy of leeches, as biological agents, in control of snail intermediate hosts of schistosomiasis (bulinus truncatus, biomphalaria alexandrina) and fascioliasis (lymnaea natalensis) as well as their effect on the non-target snails physa acuta, melanioides tuberculata and cleopatra bulimoides was evaluated. two glossiphoniid snail leeches, helobdella nilae and alboglossiphonia conjugata were used. they destroyed egg masses and young snails more rapidly than adult ones. h. nilae showed a st ...	2009	19530628
a study on biological control of six fresh water snails of medical and veterinary importance.	this study evaluated the molluscicidal effect of commiphora mnolmol oil extract (myrrh), on control of six fresh water snails (lymnaea natalensis, bulinus truncatus, biomphalaria alexandrina, physa acuta, melania tuberculata and cleopatra bulimoides). also, the extract effect on the egg masses of l. natalensis, b. truncatus, b. alexandrina and ph. acuta was evaluated. snails and egg masses were exposed at 16-20 degrees c to various concentrations (conc.). ld50 after 24 hours expo-sure were 264/1 ...	2009	19530615
susceptibility of saudi bulinus truncatus to infection with egyptian schistosoma haematobium with observations on protein electrophoretic pattern of the snails.	a laboratory-based susceptibility study was carried out on snails bulinus truncatus collected from highland abha, asser, saudi arabia to egyptian schistosoma haematobium to investigate the potential role of saudi b. truncatus in the transmission of egyptian s. haematobium and to know the possibility that the parasite might be able to spread into saudi arabia. the results revealed that, compared to egyptian snails, survival of snails at day 25 post-exposure was significantly higher in saudi b. tr ...	2009	19329256
natural infection of fasciola hepatica (trematoda: fasciolidae) in bulinus truncatus (gastropoda: planorbidae) in northern tunisia.	monthly samples of bulinus truncatus were collected during a year from a cattle-breeding farm located in the region of sejnane (north tunisia) to detect natural infections with fasciola hepatica and determine seasonal variations of the prevalence throughout a year. of the 163 adult bulinids, larval forms of f. hepatica were found in 39% of snails. two peaks in prevalence, the first in june and the second in october, were also noted. bulinus truncatus can be added to the list of potential interme ...	2009	19193249
molluscicidal and schistosomicidal activities of a steroidal saponin containing fraction from dracaena fragrans (l.).	the steroidal saponin-containing fraction from methanolic extract of dracaena fragrans (family: agavaceae) was tested for molluscicidal and ovicidal activities against biomphalaria alexandrina and bulinus truncatus, the snail vectors of schistosoma mansoni and s. haematobium in egypt, respectively. it was also tested for schistosemicidal activity in vitro on adult s. mansoni and against the free-living miracidia and cercariae of the parasite. the homogenated soft body of b. alexandrina was used ...	2008	18853630
immunolocalization of schistosoma mansoni and schistosoma haematobium antigens reacting with their egyptian snail vectors.	the reaction of the haemolymph and the tissue of infected intermediate hosts, biomphalaria alexandrina and bulinus truncatus to schistosoma mansoni and s. haematobium antigens were investigated using the indirect immunoperoxidase technique. a new technique, agarose cell block was used in collection of haemolymph which helped in collecting plenty of well formed cells in comparison to the ordinary one using the cytospin. collected haemolymph and prepared tissues of uninfected and infected b. alexa ...	2007	18383803
[focusing of schistosoma haematobium transmission in irrigated perimeters of the niger valley (niger): importance of malacological factors].	currently, the control of urinary schistosomiasis is mostly based on mass treatment. characterization of schistosoma haematobium transmission could lead to adding new methods to the control strategy.	2008	18314284
experimental schistosomiasis; the culture of the snail vectors planorbis boissyi and bulinus truncatus.		1949	18121265
[bulinus truncatus, planorbarius metidjensis and endemic bilharziosis in the southwestern morocco].	since planorbarius metidjensis was recently found to be an experimental intermediate host of schistosoma haematobium in the south-west of morocco, a study on planorbid and b. truncatus was carried out from 1997 to 2005. eleven planorbid populations were identified in 1997 in the agadir province, all living at high altitude (from 340 to 1380 m). in contrast, most of the seven bulinid populations inhabited low-lying zones. three annual generations of p. metidjensis (april-july june-september, and ...	2007	17824308
effects of schistosoma mansoni and schistosoma haematobium infections on calcium content in their intermediate hosts.	flame atomic absorption spectrometry was performed to determine the alteration of calcium concentration in the soft parts and shells of biomphalaria alexandrina and bulinus truncatus due to the infection with schistosoma mansoni and s. haematobium, respectively. the results showed significant lowering in the calcium content of the shells of cercariae shedding b. alexandrina and b. truncatus relative to the calcium content in the shells of uninfected ones. in contrast, the calcium content in the ...	2007	17497170
molluscicidal properties of acacia nilotica.	the acetone, alcohol and aqueous extracts of fruits of acacia nilotica (l) willd. ex del. (mimosaceae) showed molluscicidal activity against bulinus truncatus and biomphalaria pfeifferi, the two snail species which transmit schistosomiasis in the sudan (s. haematobium and s. mansonii). tan, a new vegetable molluscicide prepared from the aqueous extract of the fruits of a. nilotica was produced on a pilot scale by using the spray drying procedure. due to the high content of tannins in the powder ...	1982	17396969
investigations of molluscicidal activity of certain sudanese plants used in folk-medicine. part iv*.	50 plants indigenous to the sudan and of common use in sudanese folk-medicine, were screened for their molluscicidal activity, using two local snail vectors, bulinus truncatus and biomphalaria pfeifferi. at different concentrations 31 (62%) of these plant samples were found to be lethal to either one or both of the snail species. 28 (56%) proved to be lethal to biomphalaria pfeifferi, 22 (44%) gave 100% mortality to bulinus truncatus; while 19 (38%) killed both snail hosts (table i). the seven m ...	1984	17340255
habitats of bulinus truncatus and planorbarius metidjensis, the intermediate hosts of urinary schistosomosis, under a semiarid or an arid climate.	since bulinus truncatus and planorbarius metidjensis are the intermediate hosts of schistosoma haematobium in southwestern morocco, five rivers were investigated to identify sites colonized by either of both species and determine the characteristics of their habitats via the study of 12 physicochemical parameters in running water. p. metidjensis was observed in the upper valleys of three rivers, whereas b. truncatus was found in sites of lower altitude. a component analysis demonstrated that alt ...	2007	17340142
population dynamics of chaetogaster limnaei (oligochaeta: naididae) in the field populations of freshwater snails and its implications as a potential regulator of trematode larvae community.	the objectives of this work were to study (1) the population dynamics of chaetogaster limnaei in the field populations of freshwater snails and the implications for the species as a potential regulator of the trematode larvae community and (2) prevalence and intensity of c. limnaei in relation to host species, host size, and season. this study was conducted at al-salam canal and al-abtal village (new cultivated area in north sinai). the samples were collected from march 2004 to february 2005. th ...	2007	17252272
discriminant analysis of free fatty acids of some egyptian snails as a step for schistosomiasis control: new trends.	schistosomiasis is still the most common occupational health problem of rural workers in egypt. the use of molluscicides, either chemical or biological, and environmental changing are the most successful methods of snail control. the new trend in schistosoma control programs is to study the ecological factors that attract miracidium schistosoma specific snails, to emphasizing to find out new environmental safe control methods. since schistosoma worms do not make fatty acids de novo, they require ...	2000	17219851
electrophoretic patterns of protein fractionations in hemolymph and tissues of biomphalaria alexandrina and bulinus truncatus during course of schistosome infection.	electrophoresis of plasma protein of b. alexandrina (uninfected & infected with s. mansoni) showed that the major dominant bands had molecular weights of 20, 44, 96, 139 & 205 kd in both types of snails. the 1day & 1 week post miracidial exposure (pme) groups were characterized by band 54 kd. all groups except a day pme were characterized by a common band of mw 65 kd. three days pme group had. three bands of 123 kd, 150 &177 kd, not found in other groups. the highest similarity index in 2 weeks ...	2006	17153696
identification of the boudicca and sinbad retrotransposons in the genome of the human blood fluke schistosoma haematobium.	schistosomes have a comparatively large genome, estimated for schistosoma mansoni to be about 270 megabase pairs (haploid genome). recent findings have shown that mobile genetic elements constitute significant proportions of the genomes of s. mansoni and s. japonicum. much less information is available on the genome of the third major human schistosome, s. haematobium. in order to investigate the possible evolutionary origins of the s. mansoni long terminal repeat retrotransposons boudicca and s ...	2006	17072464
[cleaning and molluscicide treatment for schistosomiasis control].	we evaluated the effect of niclosamide treatment and the additional cleaning of basins and pools on the density and infection rate of bulinus truncatus within the irrigation network of oudaya. the period prior to molluscicide treatment (january-may) revealed a mean density of 151 snails/m2 in 1995-96 and 127 snails/m2 in 1997-98. after cleaning had started, the mean density prior to molluscicide treatment fell to 84 snails/m2 in 1999-2000. after molluscicide treatment, densities dropped to very ...	2006	17037230
molluscicidal effect of three monoterpenes oils on schistosomiasis and fascioliasis vector snails in egypt.	thymol, linalool and eugenol showed considerable molluscicidal effect against biomphalaria alexandrina, bulinus truncatus and lymnneae natalensis. the thymol was the potent one at least lc50 and lc90) followed by euganol then linalool. l. natalensis were more sensitive to these compounds followed by b. truncatus and then b. alexandrina. the lc50 & lc90) of thymol were 22 and 34 ppm against b. alexaldrina, 20 and 30 ppm for b. truncatuts and 18 and 29 ppm for l. nalalensis. these values were high ...	2006	16927871
molluscicidal activities of aqueous extract of the sea anemone parasicyonis actinostoloides against vector snails bulinus truncatus and lymnaea natalensis.	the aqueous extract of the sea anemone parasicyonis actinostoloides showed molluscicidal effect against vector snails of schistosoma hacematobium and fasciola gigantica after 24 hours of exposure. lc50) and lc90 values for p. actinostoloides were 40 & 78.6 ppm for b. runcatus and 46.6 & 86.5 ppm for l. natalensis respectively. the effect of continuously exposure of b. truncatits and l. naltlensis to sublethal aqueous extract concentrations (lc0, lc10 & lc25) on survival rate, egg production and ...	2006	16927866
epidemiology of schistosoma mansoni infection and its relationship to snail distribution in a village at the nile bank south to cairo.	the relationship between epidemiology of s. mansoni infection and snail distribution at a village, related to guiza governorate and lies south to cairo, was investigated. a systematic random sample of houses was selected. all inhabitants of the houses were invited to share in the study. the number examined was 704. urine and stools were examined using nucleopore filtration and standard kato-katz techniques, respectively. snail collection was done from 35 sites along the water bodies related to t ...	2004	16916052
molecular phylogeny of diploid bulinus sp. (gastropoda: planorbidae) populations in cameroon crater lakes.	bulinus sp. (2n=36) is a diploid freshwater snail found in cameroon crater lakes; it belongs to a group of medically important freshwater snails. some members (bulinus truncatus, bulinus tropicus) of this group had been reported to be involved in the transmission of parasites (schistosoma sp. and calicophoron microbothrium) to human and livestock in tropical africa. yet, understanding of the evolutionary identity of the diploid snail such as its phylogenetic position and the genetic divergence a ...	2007	16809073
molluscicidal activity against bulinus truncatus of croton campestris.	the bark of croton campestris provided three furano-clerodane named, respectively, velamone, velamolone acetate and velamolone. fractions containing these diterpenoids were investigated for their molluscicidal activity against bulinus truncatus, one of the aquatic snail vectors of schistosomiasis. a dichloromethanic extract of root barks, rich in furano-clerodane and molluscicidal at 20ppm was promising as natural molluscicide. enriched fraction with velamone gave 80% mortality from 25ppm, while ...	2006	16793217
effect of water plants and non-target snails on the infectivity of bulinus truncatus with schistosoma haematobium.	the application of the water plant (ceratophyllum demersum, eichhornia crassipes and lemna gibba) and/or non-target snails (planorbis planorbis, physa acuta and melanoides tuberculata) gave a significant degree of reduction in the infection rate of b. truncatus subjected to s. haematobium miracidia. the data also indicated a reduction in mean total number of cercarial production/snail. however, no significant difference was detected in the prepatent period and duration of cercarial shedding of t ...	2005	16333895
two glutathione s-transferase isoenzymes purified from bulinus truncatus (gastropoda: planorbidae).	we purified and characterized two major glutathione s-transferase isoenzymes (gst2 and gst3) from snail bulinus truncatus (mollusca, gastropoda, planorbidae) tissue. the km with respect to 1-chloro-2, 4-dinitrobenzene (cdnb) for both isoenzymes was increased as the ph decreased. km of both isoenzymes with respect to glutathione (gsh) doubled when the ph was increased from 6.0 to 6.5. acid inactivated gst2 and gst3 and the two enzymes were almost inactive at ph 3.5. however, they retain the full ...	2006	16311050
crystal structure of acetylcholine-binding protein from bulinus truncatus reveals the conserved structural scaffold and sites of variation in nicotinic acetylcholine receptors.	the crystal structure of acetylcholine-binding protein (achbp) from the mollusk lymnaea stagnalis is the established model for the ligand binding domains of the ligand-gated ion channel family, which includes nicotinic acetylcholine, 5-hydroxytryptamine (5-ht3), gamma-aminobutyric acid (gaba), types a and c, and glycine receptors. here we present the crystal structure of a remote homolog, achbp from bulinus truncatus, which reveals both the conserved structural scaffold and the sites of variatio ...	2005	15899893
spot light survey on fresh-water snails of medical importance in al fayoum governorate, egypt.	in a survey carried out during summer and autumn of 2004, for snails of medical importance, nine species were recovered. these were biomphalaria alexandrina, b. glabrata, b. pfeifferi, bulinus truncatus, b. forskalii, lymnaea natalensis, bellamya (=vivipara) unicolor, physa acuta and hydrobia musaensis. parasitological examination revealed that b. alexandrina, b. glabrata and l. natalensis harboured immature stages of their concerned trematode parasites. moreover, p. acuta harboured the immature ...	2005	15880994
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
environmental control of schistosomiasis through community participation in a moroccan oasis.	summary akka oasis, in the province of tata, southern morocco, is one of the oldest foci of urinary schistosomiasis in morocco where transmission is still taking place. we report the results of two studies: a cross-sectional snail survey investigated the distribution of bulinus truncatus in relation to habitat factors in the akka traditional irrigation system. the presence of aquatic vegetation, especially potamogeton sp. was identified as a key factor determining snail occurrence and abundance ...	2004	15361113
[schistosomiasis endemic in burkina faso].	burkina faso, through the works of many teams of the occge based in bobo-dioulasso, has signi-ficant data on several tropical endemics of which schistosomiasis. with the complementary works, it appears to be possible to establish a distribution of the schistosomiasis which reveals its importance. it will be the first stage of the planned national control program. the parasitologic data-gathering which covers the period of 1951 to 2000, used all the standard techniques. it is about kato-kartz and ...	2004	15104159
[experimental study of the compatibility between schistosoma haematobium and two species of bulinus in cameroon].	a study on the compatibility between schistosoma haematobium from three remote localities (mourtourwa, gounougou and kékem) and four populations of bulinus truncatus (gounougou, ngaoundéré, bertoua and kékem) and four populations of b. globosus (mourtourwa, ouroudoukoudje, bafia and yaoundé) was undertaken in order to estimate the risk of extension of urinary schistosomiasis in cameroon. first generation of offspring from wild bulinus was exposed to miracidia liberated by schistosome eggs extrac ...	2004	15104158
[bulinus truncatus, intermediate host of schistosoma haematobium in the senegal river basin (srb)].	to assess the role of bulinus truncatus in the transmission of urinary schistosomiasis in the senegal river basin (srb), the relations between b. truncatus and schistosoma haematobium were studied. the compatibility study shows that b. truncatus is susceptible to infection with s. haematobium in the upper valley of the srb. the malacological follow up reveals the presence of b. truncatus naturally infected with schistosomes cercariae in the middle valley. the identification of these schistosomes ...	2004	15104154
[heterogeneity of schistosoma haematobium transmission in irrigated fields].	heterogeneity of schistosoma haematobium transmission in irrigated fields. although irrigated areas exist since a long time in the niger valley the distribution of the urinary schistosomiasis does not appear homogeneous, testifying to the existence of limiting or favourable factors. the identification of these factors could lead to a better definition of the distribution of the schistosomiasis risks and to optimise control programmes. the population of five villages about 1,900 inhabitants livin ...	2004	15104152
[recent evolution of schistosomiasis in the water project of sourou in burkina faso].	in order to help the hydro-agricultural projects in the management of water resources together with a schistosomiasis control programme, it is important to evaluate the extent of the problem. this is the reason why parasitological and clinical surveys were conducted in schools associated with malacological surveys in transmission sites of several water projects including the one from sourou. the data-collecting for the research on molluscs was carried out in surface water and as for parasitologi ...	2004	15104151
the effects of myrrh (commiphora molmol) on the infected snails of schistosoma sp. and their egg masses: effect on shedding of cercariae and on snail fecundity.	myrrh has molluscicidal effect on infected bulinus truncatus and biomphalaria alexandrina snails at low concentrations (10 & 20 ppm respectively) after 24 hours exposure. the number of dead-snails increased with prolongation of exposure time. all schistosoma free cercariae were killed by 2.5 ppm within 15 minutes. one day-old egg masses were more susceptible to the ovicidal effect of myrrh than the five-day old ones. both types of eggs were more resistant to the effect of myrrh than the adult sn ...	2003	14964669
correlation between snails and fish in fish ponds of world fish center (iclarm) with special reference to snail vectors of schistosomiasis and fascioliasis.	the abundance of snail species in earthen fish ponds, irrigation and drainage canals at world fish center (iclarm) in descending order was bellamya unicolor (50.89%) > physa acuta (18.94%) > cleopatra bulimoides (7.6%) > lanistes carinatus (6.73%) > bulinus truncatus (5.19%) > melanoides tuberculata (4.83%) > lymnaea natalensis (3.14%) > gabbiella senaariensis (0.9%) > biomphalaria alexandrina (0.55%) > lym naea truncatula (0.4%) > planorbis planorbis and succinea cleopatra (0.33%) > ferrissia i ...	2003	14964656
life span and monthly mortality rate of bulinus truncatus and planorbis biossyi, the intermediate hosts of schistosomiasis in egypt.		1951	14841560
a phallus for free? quantitative genetics of sexual trade-offs in the snail bulinus truncatus.	resource allocation is thought to play a key role in the coexistence of different sexual morphs within hermaphroditic species. indeed, most models assume that sexual functions are subject to a balance between reproductive advantage and energetic cost. various types of cost (e.g. organ construction, maintenance and utilization) and levels of trade-off (physiological and genetic) may be considered. we here examine physiological and genetic costs of phallus construction and maintenance in bulinus t ...	2003	14635876
[transmission of schistosoma haematobium in the town of niamey, niger].	located in an area where schistosoma haematobium is hyperendemic, the town of niamey is a focus of hypoendemicity. the aim of the malacological follow-up studies undertaken over a one year period was the determination of the mollusc species present in the water bodies, the appreciation of their space-time distribution of the snail and to find out the potential seasons of transmission. the investigation applied to 22 sites of transmission in the urban community. four molluscs species (bulinus tru ...	2003	14582291
biological studies on the snail, bulinus truncatus, in central iraq.	this paper presents some results of field and laboratory studies on bulinus truncatus, the snail intermediate host of urinary bilharziasis in iraq, made in 1958 as part of the work of the who bilharziasis control project in that country.observations on the linear distribution and size composition of bulinus populations in the canals of central iraq indicate that molluscicides might most suitably be applied in may before the entire snail population reaches breeding size, or early in november when ...	1961	14478049
studies on bilharziasis endemicity in the vicinity of basra, iraq.	this paper reports on investigations into the distribution of snail genera and possible limiting environmental factors in the endemic and non-endemic areas of human bilharziasis in and near basra, carried out in 1958 by the who bilharziasis control project staff in iraq. these investigations confirmed the existence of an abrupt line of demarcation between these areas immediately south of basra.during june and october 1958, the known intermediate snail host, bulinus truncatus, was not found in ca ...	1961	14478047
the relation of water volume to egg production in the snail bulinus truncatus.		1960	14425855
further study on the ecology of the intermediate host of schistosoma haematobium, bulinus truncatus baylis.		1955	14389815
[development rhythm of bulinus truncatus in laboratory rearing].		1955	14388431
[observations on the biology of bulinus truncatus in khouzistan (iran)].		2006	13946816
the breeding of bulinus truncatus in total darkness.		1961	13783438
egg-laying capacity of the small bulinus truncatus in relation to infection with schistosoma haematobium.		1961	13727550
the susceptibility and resistance of bulinus (physopsis) globosus and bulinus (bulinus) truncatus rohlfsi to two strains of schistosoma haematobium in ghana.	the author presents the results of some laboratory experiments carried out to determine the susceptibility of the snail vectors of bilharziasis in ghana to local strains of schistosoma haematobium, isolated from children living in two districts near accra: the ke district, where bulinus (bulinus) truncatus rohlfsi is the important snail vector, and the pokoasi district, where bulinus (physopsis) globosus is the exclusive intermediate host.each strain was found to be virtually specific in its abi ...	1959	13638791
[changes in the chemical composition of water & changes in abundance of the bulinus truncatus audion].		1958	13573129
[comparative evaluation of the abundance of reservoir in river mollusca, especially of the bulinus truncatus audouin].		1958	13573128
ecology and distribution of bulinus truncatus in the middle east; with comments on the effect of some human activities in their relationship to the snail host on the incidence of bilharziasis haematobia in the middle east and africa.	the author gives a comprehensive account of the present status of knowledge regarding the ecology and distribution of bulinus truncatus, the intermediate host of schistosoma haematobium in the middle east and north africa. he discusses in detail the types of habitat favoured by this snail, its life-cycle and seasonal variations in its populations, the effect of ecological factors on its distribution and occurrence, and the relationship between its control and its bionomics, stressing the many as ...	1958	13573115
[biological rhythms of mollusca vectors of bilharziasis; seasonal factors & climatic effects on the reproduction cycle of bulinus truncatus & planorbarius metidjensis in north africa].		1958	13573111
the effect of water movement on populations of bulinus truncatus.		1957	13463218
effect of human pollution on density of populations of bulinus truncatus.		1956	13413377
notes on human schistosomiasis in iraq, with particular regard to the bionomics of the intermediate host, bulinus truncatus baylis.		1954	13219437
experimental infection of bulinus truncatus with schistosoma haematobium.		1953	13045190
spatial and temporal variation of life-history traits documented using capture-mark-recapture methods in the vector snail bulinus truncatus.	the population biology of the schistosome-vector snail bulinus truncatus was studied in an irrigation area near marrakech, morocco, using demographic approaches, in order to estimate life-history parameters. the survey was conducted using 2 capture-mark-recapture analyses in 2 separate sites from the irrigation area, the first one in 1999 and the second one in 2000. individuals larger than 5 mm were considered. the capture probability varied through time and space in both analyses. apparent surv ...	2003	12964827
compatibility of schistosoma haematobium, s. intercalatum and their hybrids with bulinus truncatus and b. forskalii.	schistosoma haematobium and s. intercalatum readily hybridize with each other producing generations of viable hybrid offspring. experiments were designed to investigate the infectivity and viability of the s. haematobium x s. intercalatum f1 and f2 hybrid larvae in their two intermediate snail hosts compared with the parental species. analysis of the data obtained suggested that the s. haematobium male x s. intercalatum female f1 hybrid miracidia were more infective to bulinus truncatus than to ...	2003	12964826