Distribution and Schistosoma mansoni infection of Biomphalaria glabrata in different habitats in a rural area in the Jequitinhonha Valley, Minas Gerais, Brazil: environmental and epidemiological aspects

Kloos, Helmut; Passos, Liana Kanovaloff Janotti; LoVerde, Philip T.; Correa-Oliveira, Rodrigo; Gazzinelli, Andréa

doi:10.1590/s0074-02762004000700002

Cited by 36 publications

(22 citation statements)

References 19 publications

(23 reference statements)

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“…Most specialized studies map snail infections or relate snail distributions to schistosomiasis prevalence with the objective of identifying high-risk areas, by studying human water contact sites (Barbosa et al, 2004(Barbosa et al, , 2014Kloos et al, 2004;Araujo et al, 2007). It is clear that the ability to predict the spatial distribution of infections improves our understanding of co-endemicity and its distribution, which can be used as evidence base for the spatial orientation of large integrated control programs (Brooker and Clements, 2009).…”

Section: Discussionmentioning

confidence: 99%

Predicting frequency distribution and influence of sociodemographic and behavioral risk factors of Schistosoma mansoni infection and analysis of co-infection with intestinal parasites

et al. 2015

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Geospatial analysis was used to study the epidemiology of Schistosoma mansoni, intestinal parasites and co-infections in an area (Ilha das Flores) in Sergipe, Brazil. We collected individually georeferenced sociodemographic, behavioral and parasitological data from 500 subjects, analyzed them by conventional statistics, and produced risk maps by Kernel estimation. The prevalence rates found were: S. mansoni (24.0%), Trichuris trichiura (54.8%), Ascaris lumbricoides (49.2%), Hookworm (17.6%) and Entamoeba histolytica (7.0%). Only 59/500 (11.8%) individuals did not present any of these infections, whereas 279/500 (55.8%) were simultaneously infected by three or more parasites. We observed associations between S. mansoni infection and various variables such as male gender, being rice farmer or fisherman, low educational level, low income, water contact and drinking untreated water. The Kernel estimator indicated that high-risk areas coincide with the poorest regions of the villages as well as with the part of the villages without an adequate sewage system. We also noted associations between both A. lumbricoides and hookworm infections with low education and low income. A. lumbricoides infection and T. trichiura infection were both associated with drinking untreated water and residential open-air sewage. These findings call for an integrated approach to effectively control multiple parasitic infections.

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Section: Discussionmentioning

confidence: 99%

Predicting frequency distribution and influence of sociodemographic and behavioral risk factors of Schistosoma mansoni infection and analysis of co-infection with intestinal parasites

et al. 2015

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“…Malacological surveys revealed the high transmission potential of the 11 types of natural and manmade snail habitats studied by Kloos et al (2004). Concomitant water contact studies carried out in three representative localities in the study area that used multiple methodologies indicate high exposure risk levels for the study population (Kloos et al, in press).…”

Section: Introductionmentioning

confidence: 99%

Socioeconomic determinants of schistosomiasis in a poor rural area in Brazil

et al. 2006

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The objective of this paper is to identify and quantify socioeconomic determinants of S. mansoni infection in the rural area of Virgem das Graças in Minas Gerais State of Brazil. A cross-sectional study was carried out to examine the prevalence and intensity of schistosomiasis in relation to socioeconomic characteristics of the households. Log-binomial regression analysis was used to examine the data on both the household and individual levels, analyzing the prevalence ratios for the association of schistosomiasis and socioeconomic variables related to the head of the household. Multiple comparisons through mixed effect modeling were used to examine the relationship between intensity of infection (geometric mean egg counts) and different levels of socioeconomic variables, respectively. In the univariate analysis, place of residence, number of persons per room, and lack of motorized transport were associated with schistosomiasis at the household level and age and unsafe water contact at the individual level. Age, unsafe water contact, number of persons per room, household possessions and lack of education of head of household remained significant predictors of schistosomiasis in the multivariable analysis. Only age was significantly associated with intensity of infection of individuals. It is concluded that widespread poverty, the rural environment, and weak socioeconomic differentiation that result in intense contact with infective water appear to minimize the protective effect of piped water supply and other socioeconomic parameters on schistosomiasis found in other studies. The potential role of socioeconomic development in conjunction with schistosomiasis control is described and areas for further studies are identified.

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“…The most frequent taxa (Biomphalaria, Pomacea canaliculata and Drepanotrema) was previously observed in different wetland classes, such as lakes, ponds, streams, backwater rivers, dams and rice fields (Chieffi and Moretti, 1979;Bonetto et al, 1982;Mochida, 1991;Pereira et al, 2000aPereira et al, ,b, 2001Kloos et al, 2004;Agudo-Padrón and Oliveira, 2008). The high frequency of Pomacea canaliculata, Pisidium and Eupera can be attributed to their ability to support variations at water level (Bachmann, 1960;Junk andRobertson, 1997, Kretzschmar andHeckman, 1995).…”

Section: Discussionmentioning

confidence: 76%

Responses of freshwater molluscs to environmental factors in Southern Brazil wetlands

et al. 2010

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Freshwater molluscs play an important role in aquatic ecosystems, providing food for many fish species and vertebrates. Investigations on factors that determine mollusc species richness and distribution in wetland systems are scarce in the Neotropical region. The main goal of this study was to determine how much variation in mollusc richness and composition is explained by area, hydroperiod, altitude, water conductivity, and dominant aquatic vegetation. This survey was performed in an extensive area of a Neotropical region (~280,000 km 2 in southern Brazil), with a large number of wetland systems (111) and covering a wide gradient of altitude and wetland surface area. The mollusc richness was positively associated with wetland area and negatively associated with altitude. The richness and composition of the freshwater molluscs were similar between permanent and intermittent wetlands and it did not differ significantly between aquatic bed and emergent wetlands. The first three axes of CCA explained 16.2% of the total variation in the composition of the freshwater mollusc observed. The variation in the composition had a correlation with wetland area, altitude and water conductivity. Our results showed that the wetlands are important habitats for molluscs in southern Brazil, and that the richness and the composition of molluscs were associated with area, altitude, water conductivity and dominant vegetation.Keywords: wetland area, altitude, hydroperiod, aquatic vegetation, neotropical region. Respostas de moluscos límnicos a fatores ambientais em áreas úmidas do sul do Brasil ResumoMoluscos límnicos desempenham um papel importante em ecossistemas aquáticos, fornecendo alimento para diversos peixes e vertebrados. Investigações sobre os fatores que determinam a riqueza e a distribuição das espécies de moluscos em áreas úmidas são escassos na região neotropical. O principal objetivo deste estudo foi determinar a variação na riqueza e na composição de moluscos em função da área, hidroperíodo, altitude, condutividade da água e tipo de vegetação aquática dominante. Este estudo foi desenvolvido em uma extensa área Neotropical (~280.000 km 2 no sul do Brasil), com um elevado número de áreas úmidas (111) e compreendeu um amplo gradiente de altitude e tamanho de áreas úmidas. A riqueza de moluscos foi positivamente relacionada com o tamanho da área úmida e negativamente relacionada com a altitude. A riqueza e a composição de moluscos foram similares entre áreas úmidas permanentes e intermitentes e não diferiram significativamente entre áreas úmidas herbáceas e emergentes. Os três primeiros eixos da CCA explicaram 16,2% da variação na composição de moluscos. A variação na composição foi correlacionada com a área, altitude e condutividade da água. Nossos resultados mostraram que as áreas úmidas são ecossistemas importantes para os moluscos límnicos no sul do Brasil e que a riqueza e a composição de moluscos estiveram relacionadas à área, altitude, condutividade da água e tipo de vegetação aquática dominante.Palavras-cha...

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Distribution and Schistosoma mansoni infection of Biomphalaria glabrata in different habitats in a rural area in the Jequitinhonha Valley, Minas Gerais, Brazil: environmental and epidemiological aspects

Abstract: This paper examines the distribution and infection of

Cited by 36 publications

References 19 publications

Predicting frequency distribution and influence of sociodemographic and behavioral risk factors of Schistosoma mansoni infection and analysis of co-infection with intestinal parasites

Predicting frequency distribution and influence of sociodemographic and behavioral risk factors of Schistosoma mansoni infection and analysis of co-infection with intestinal parasites

Socioeconomic determinants of schistosomiasis in a poor rural area in Brazil

Responses of freshwater molluscs to environmental factors in Southern Brazil wetlands

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