Topic
Bulinus truncatus
About: Bulinus truncatus is a research topic. Over the lifetime, 414 publications have been published within this topic receiving 5640 citations.
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TL;DR: The identification of these schistosomes as S. haematobium by the Single Strand Conformational Polymorphism technique (SSCP) confirms the participation of B. truncatus in the dynamic transmission of urinary schisto-schistosomiasis in the Senegal River Basin.
Abstract: Une etude des relations entre Bulinus truncatus et Schistosoma haematobium a ete effectuee dans le bassin du fleuve Senegal (BFS) pour evaluer le role de B. truncatus dans la transmission de la schistosomose urinaire au Senegal. Les tests de compatibilite montrent une susceptibilite de B. truncatus a l'infestation par S. haematobium dans la Haute vallee du BFS. Le suivi malacologique revele la presence de B. truncatus naturellement infestes dans la Moyenne vallee. En outre, l'identification de l'espece S. haematobium chez ces bulins par la technique du Single Strand Conformational Polymorphism (SSCP) confirme la participation de B. truncatus dans la dynamique de transmission.
21 citations
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TL;DR: It is concluded that the optimum transmission seasons in bilharziasis-endemic areas in Iran are spring and autumn but that transmission still occurs in hot summer and cold winter months although to a much smaller extent.
Abstract: Laboratory studies were made in Iran to test the effect of water temperature on the ability of the miracidia of S. haematobium to penetrate B. truncatus. Snails three to four weeks old were exposed to two miracidia each for two hours at nine water temperatures ranging from 10°C to 38°C. After exposure, all the snails were kept in aquaria at room temperature. The cercaria-positive rates of these nine groups of snails showed that the optimum exposure temperature was in the range 20°C-30°C. The infection rate was low at temperatures outside this range. It is concluded that the optimum transmission seasons in bilharziasis-endemic areas in Iran are spring and autumn but that transmission still occurs in hot summer and cold winter months although to a much smaller extent.
21 citations
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TL;DR: In this article, the authors investigated the effect of the age of Bulinus truncatus on the development of S haematobium and found that the infection rates were higher in the snails of two to five weeks of age than in those of one week.
Abstract: This paper is the first of a series of four on various aspects of the interaction between Bulinus truncatus and the bilharziasis parasite Schistosoma haematobium It describes laboratory studies conducted to determine the effect of the age of B truncatus on the development of S haematobium The results indicated (1) that the young snails could be infected even if they were one day old; (2) that the infection rates were higher in the snails of two to five weeks of age than in those of one week; (3) that the cercarial-incubation period was shorter in the young snails than in the older ones; (4) that the survival rate of the snails in the cercarial-incubation period was lower in the young snails than in the older ones; (5) that the survival rate of the cercaria-shedding snails was also apparently lower in the young ones than in the older ones; (6) that the maximum life-span for a cercaria-positive snail extended to 329 days after the date of exposure to infection
20 citations
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TL;DR: The host-finding behavior of miracidia of 2 strains of Schistosoma mansoni from Egypt and Brazil was studied by recording their responses to snail-conditioned water from the Egyptian sympatric snails.
Abstract: The host-finding behavior of miracidia of 2 strains of Schistosoma mansoni from Egypt and Brazil was studied by recording their responses to snail-conditioned water (SCW) from the Egyptian sympatric snails, Biomphalaria alexandrina, Physa acuta, Lymnaea cailliudi, and Bulinus truncatus, as well as from Biomphalaria arabica and Biomphalaria glabrata. Miracidia of the Egyptian strain significantly preferred SCW from their compatible hosts B. alexandrina and B. arabica and showed no or a weak response to SCW from the other sympatric species, whereas miracidia of the Brazilian strain did not differentiate between SCW from different snail species.
20 citations
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TL;DR: The presence of aquatic weeds and favourable physicochemical conditions of the water were found to provide a conducive environment for the vectors to thrive and hence sustain schistosomiasis transmission in the head pond and it is recommended that a 5-year period of studies be undertaken to assess the impact of manual clearing of aquaticweed on the snail population.
Abstract: Schistosomiasis, a parasitic disease caused by the blood fluke Schistosoma sp. became a serious public health problem in Ghana after the Volta River was dammed in Akosombo in 1964. The formation of the Kpong head pond, about 25 km below the Akosombo dam, as a result of a second dam built at Kpong became an active schistosomiasis transmission site. The Volta River Authority (VRA) recently began an initiative of combining manual clearing of aquatic vegetation with chemotherapy as a way of managing the disease. However, no scientific monitoring of the effect of aquatic weed clearing on the vector population is being conducted. The study was initiated in the Kpong head pond to provide baseline data for subsequent monitoring and impact assessment of the initiative. It involved sampling of the banks of the head pond for aquatic snails at six different sampling sites of 1 m2 each, chosen at 100 m interval along the shoreline. Physicochemical factors which affect aquatic snail population were also determined. Aquatic snails sampled were Bulinus truncatus , Bulinus globosus , Biomphalaria pfeifferi , Melanoides spp, Physa waterlotti and Pila sp. where the first three are intermediate host of the schistosoma parasite. The study revealed B. truncates as the most frequent occurring vector (71.0%), followed by Biomphalaria (12.0%) and B. globosus (6.1%) The mean numbers of vector snails sampled per m2 were B. Truncates 61/m2, B. globosus 5/m2, and B. pfeifferi 11/m2. The presence of aquatic weeds and favourable physicochemical conditions of the water were found to provide a conducive environment for the vectors to thrive and hence sustain schistosomiasis transmission in the head pond. It is, therefore, recommended that a 5-year period of studies be undertaken to assess the impact of manual clearing of aquatic weeds on the snail population.
20 citations