Experimental study on reproduction of the freshwater snail<i>Biomphalaria tenagophila</i>(d’Orbigny, 1835)

Guimarães, Marisa Cristina de Almeida; Menezes, Regiane Maria Tironi de; Tuan, Roseli

doi:10.1080/07924259.2016.1174156

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…This hypothesis might explain the decrease in the number of cases observed in this municipality. B. tenagophila has reproductive and physiological characteristics that enable it to proliferate in modified environments 73 and has a limited capacity to act as an IH of Sm 74,75 .…”

Section: Discussionmentioning

confidence: 99%

Schistosomiasis in the Middle Paranapanema river region, state of São Paulo, Brazil: Does it matter today for public health?

Palasio

Bortoleto

Rosa-Xavier

et al. 2019

Rev. Soc. Bras. Med. Trop.

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Introduction: The Middle Paranapanema watershed is known for the transmission of schistosomiasis, and there have been autochthonous cases since 1952. This study aimed to describe this disease in space and time and evaluate its current importance as a public health problem. Methods: Thematic maps showing the risk areas for transmission of schistosomiasis, using scan statistics, and flow maps were created in the period 1978-2016. Incidence was calculated, and the existence of spatial dependence between autochthonous and imported cases was evaluated using Ripley's K12-function. Species of snails were identified in high-risk clusters. Results: A total of 1,511 autochthonous cases were reported in eight of the 25 municipalities in the study area, of which 92.8% occurred in Ourinhos. A total of 2,189 imported cases were reported (27% in Ourinhos and 20% in Assis), mainly originating in the states of Paraná and Minas Gerais. Clusters of autochthonous and imported cases with higher risk were identified in Ourinhos, Assis and Ipaussu. However, over the years, the cases began to occur in low density in Ourinhos and no longer in other municipalities in the region. The cluster detected in the period 2007-2016 in Ourinhos still has risk for the transmission of schistosomiasis. K12-function analysis indicated positive spatial dependence between autochthonous and imported cases. Conclusions: The study showed that, currently, schistosomiasis as a public health problem in Middle Paranapanema is restricted to Ourinhos. This fact may be related to the presence of Biomphalaria glabrata at a specific point and low coverage of basic sanitation.

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Section: Discussionmentioning

confidence: 99%

Schistosomiasis in the Middle Paranapanema river region, state of São Paulo, Brazil: Does it matter today for public health?

Palasio

Bortoleto

Rosa-Xavier

et al. 2019

Rev. Soc. Bras. Med. Trop.

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“…As other Hygrophila, B. tenagophila is able to self-and cross-fertilise. Under experimental conditions, B. tenagophila showed high rates of self-fertilisation (GuiMaRãeS et al 2016) suggesting that this mode of reproduction is an important and efficient component of the mating system in the species.…”

Section: Introductionmentioning

confidence: 97%

Genetic diversity of the freshwater snail Biomphalaria tenagophila (d’Orbigny, 1835) (Gastropoda: Hygrophila: Planorbidae) across two coastal areas of southeast Brazil

Palasio¹,

Zanotti-Magalhães²,

Tuan³

2018

Folia Malacol.

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This study uses two mitochondrial (COI, 16SrRNA) and one nuclear marker (ITS2) to explore genetic diversity between populations of B. tenagophila (d'Orbigny), the most common intermediate host for Schistosoma mansoni in southeast Brazil. The snails were collected in freshwater bodies along the southern coastal region of Ribeira do Iguape river basin and along the northern coastal region of the state of São Paulo, Brazil. The estimates of genetic differentiation between the populations (Φ) indicate that there is no genetic isolation between northern and southern populations. The haplotype diversity observed in B. tenagophila shows a complex pattern of distribution: in the southern region, the genetic variation in B. tenagophila is partitioned into small and more heterogeneous mitochondrial haplotypes, whereas in the northern region there were one to three homogeneous haplotypes. The results may suggest a different colonisation history across the study area.

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Molecular and morphological identification of Biomphalaria species from the state of São Paulo, Brazil

Palasio¹,

Guimarães²,

Ohlweiler³

et al. 2017

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DNA barcoding and morphological characters were used to identify adult snails belonging to the genus Biomphalaria from 17 municipalities in the state of São Paulo, Brazil. The DNA barcode analysis also included twenty-nine sequences retrieved from GenBank. The final data set of 104 sequences of the mitochondrial cytochrome oxidase I (COI) gene was analyzed for K2P intraspecific and interspecific divergences, through tree-reconstruction methods (Neighbor-Joining, Maximum Likelihood and Bayesian inference), and by applying different models (ABGD, bPTP, GMYC) to partition the sequences according to the pattern of genetic variation. Twenty-seven morphological parameters of internal organs were used to identify specimens. The molecular taxonomy of Biomphalaria agreed with the morphological identification of specimens from the same collection locality. DNA barcoding may therefore be a useful supporting tool for identifying Biomphalaria snails in areas at risk for schistosomiasis.

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Experimental study on reproduction of the freshwater snailBiomphalaria tenagophila(d’Orbigny, 1835)

Cited by 4 publications

References 26 publications

Schistosomiasis in the Middle Paranapanema river region, state of São Paulo, Brazil: Does it matter today for public health?

Schistosomiasis in the Middle Paranapanema river region, state of São Paulo, Brazil: Does it matter today for public health?

Genetic diversity of the freshwater snail Biomphalaria tenagophila (d’Orbigny, 1835) (Gastropoda: Hygrophila: Planorbidae) across two coastal areas of southeast Brazil

Molecular and morphological identification of Biomphalaria species from the state of São Paulo, Brazil

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