Seleção genética de Biomphalaria glabrata e Biomphalaria tenagophila visando a alteração da suscetibilidade e resistência ao Schistosoma mansoni

Zuim, Nádia Regina Borim; Zanotti-Magalhães, Eliana Maria; Magalhães, Luiz Augusto; Linhares, Arício Xavier

doi:10.1590/s0037-86822005000500004

Cited by 4 publications

(5 citation statements)

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“…However, subsequent generations of B. tenagophila were more susceptible to S. mansoni, as reported by Borda & Rea 14 , who found a higher infection rate in the F1 generation of B. tenagophila. Susceptibility is easier to obtain than an increase in resistance 25 . Bernadini & Machado 1 confi rmed that B. tenagophila was the vector species in schistosomiasis foci in Santa Catarina (Brazil).…”

Section: Methodsmentioning

confidence: 99%

Susceptibility of Argentinean Biomphalaria tenagophila and Biomphalaria straminea to infection by Schistosoma mansoni and the possibility of geographic expansion of mansoni schistosomiasis

Simões

Camargo

Bastos

et al. 2013

Rev. Soc. Bras. Med. Trop.

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Section: Methodsmentioning

confidence: 99%

Susceptibility of Argentinean Biomphalaria tenagophila and Biomphalaria straminea to infection by Schistosoma mansoni and the possibility of geographic expansion of mansoni schistosomiasis

Simões

Camargo

Bastos

et al. 2013

Rev. Soc. Bras. Med. Trop.

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“…Despite this high susceptibility, the significantly high mortality rate observed in infected individuals from Petponoun (Table 1) reflects the adverse effect of parasitic development on the survival of these infected individuals, and suggests that adaptation of the Petponoun population to S. mansoni from Nkolbisson is far from perfect. Since susceptibility to S. mansoni is easier to obtain over generations than resistance [26], and that an increase in temperature can induce the inversion of resistance to S. mansoni [27], the susceptibility of B. camerunensis populations to S. mansoni may increase as a consequence of global warming. Indeed, in Cameroon, the snail Bulinus camerunensis which has been formerly known to be resistant to S. haematobium strain of Barrombi-kotto is now susceptible to that strain [28].…”

Section: Compatibilitymentioning

confidence: 99%

Biomphalaria camerunensis as a viable alternative intermediate host for Schistosoma mansoni in southern Cameroon

et al. 2018

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BackgroundIntestinal schistosomiasis due to Schistosoma mansoni was mapped in Cameroon in the 1990s and preventive chemotherapy launched since 2005. A situation analysis conducted in 2011 revealed an increase in schistosomiasis transmission, especially in the equatorial part of the country, despite the fact that Biomphalaria pfeifferi, the main intermediate host of this parasite, is now scarce in many foci. Biomphalaria camerunensis, restricted to the equatorial part of the country, is considered as a less suitable host for S. mansoni due to it resistance to the parasite, although exhibiting a better survival than B. pfeifferi. In a context where human migration is quite frequent as a consequence of terrorism, war in neighboring countries, as well as development of hydraulic projects, it seems appropriate to evaluate the current epidemiological role of B. camerunensis to estimate the risk of extension of S. mansoni distribution in Cameroon. To do this, the susceptibility of three B. pfeifferi and five B. camerunensis populations to a strain of S. mansoni was assessed. Juvenile snails (G1) of each population were infected with S. mansoni miracidia, and prepatent period, infection and survival rates of infected snails, as well as cercarial production were recorded and compared between snail species and populations.ResultsCompatibility tests were performed on a total of 827 snails: 344 B. pfeifferi and 483 B. camerunensis. Infection rates were quite heterogeneous, higher in B. pfeifferi (61.5%) as compared to B. camerunensis (7.8%) (Chi-square test: χ2 = 258.88, df = 1, P < 0.0001). All the three B. pfeifferi-infected populations were susceptible to S. mansoni. However, among the five B. camerunensis populations tested, four were susceptible to S. mansoni, with 21.9% as the highest infection rate. The prepatent period was, on average, shorter in B. pfeifferi than in B. camerunensis (P < 0.0001), but the cercarial production was significantly higher in B. camerunensis as compared to B. pfeifferi (P < 0.001).ConclusionThese findings indicate that B. camerunensis populations might substantially contribute to S. mansoni transmission and dissemination in Cameroon, their low susceptibility being compensated by their high cercariae production. More attention and surveillance towards this species are required to achieve intestinal schistosomiasis elimination in Cameroon.Electronic supplementary materialThe online version of this article (10.1186/s13071-018-2763-2) contains supplementary material, which is available to authorized users.

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“…Studies of B. glabrata and B. tenagophila sought to determine alterations in susceptibility and resistance to S. mansoni. The authors found that an increase in susceptibility was more easily obtained than an increase in resistance (Zuim et al, 2005). Even in the case of hybrid mollusks (crosses between susceptible and resistant species or populations), complete resistance to schistosome infections has never been achieved (Rosa et al, 2005;Teodoro et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Host-parasite relationship between Biomphalaria amazonica (Paraense, 1966) and Schistosoma mansoni (Sambon, 1907)

et al. 2016

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Biomphalaria amazonica is a planorbid species considered a potential host of Schistosoma mansoni. It is widely distributed in the Neotropical zone, particularly in the North and Centre-West of Brazil and in the North of Bolivia. The aim of the present study was to determine the host-parasite relationship between B. amazonica and S. mansoni (BH and SJ strains). Specimens of B. amazonica and their snail-conditioned water were examined in terms of their ability to attract miracidia. The infectivity of the mollusks was determined by exposing them to 20 miracidia of both strains. Sporocyst development and amebocyte reactions were studied after each mollusk specimen was exposed to 100 miracidia. Although no cercariae were eliminated, specimens of B. amazonica proved capable of attracting 77% of the miracidia they were exposed to. Viable sporocysts with no amebocyte reaction were found 96 hours after the exposure to miracidia. These results indicate the susceptibility of B. amazonica to the BH and SJ strains of S. mansoni, and therefore demonstrate the importance of this planorbid species as a potential vector of the trematode in the areas where it occurs.Keywords: schistosomiasis, susceptibility, BH strain, SJ strain. Relação parasito-hospedeiro entre

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Seleção genética de Biomphalaria glabrata e Biomphalaria tenagophila visando a alteração da suscetibilidade e resistência ao Schistosoma mansoni

Abstract: RESUMO Gerações de

Cited by 4 publications

References 14 publications

Susceptibility of Argentinean Biomphalaria tenagophila and Biomphalaria straminea to infection by Schistosoma mansoni and the possibility of geographic expansion of mansoni schistosomiasis

Susceptibility of Argentinean Biomphalaria tenagophila and Biomphalaria straminea to infection by Schistosoma mansoni and the possibility of geographic expansion of mansoni schistosomiasis

Biomphalaria camerunensis as a viable alternative intermediate host for Schistosoma mansoni in southern Cameroon

Host-parasite relationship between Biomphalaria amazonica (Paraense, 1966) and Schistosoma mansoni (Sambon, 1907)

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