Biomphalaria species distribution and its effect on human Schistosoma mansoni infection in an irrigated area used for rice cultivation in northeast Brazil

The role of irrigated areas for the spread of schistosomiasis is of worldwide concern. The aim of the present study was to investigate the spatial distribution of the intermediate snail host Biomphalaria in an area highly endemic for schistosomiasis due to Schistosoma mansoni, evaluating the relatio...

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Bibliographic Details
Published in:	Geospatial health Vol. 6; no. 3; pp. S103 - S109
Main Authors:	Barboza, Delmany Moitinho, Zhang, Cangjie, Santos, Nathaly Cardoso, Silva, Marília Matos Bezerra Lemos, Rollemberg, Carla Virgínia Vieira, de Amorim, Fabio Jorge Ramalho, Ueta, Marlene Tiduko, de Melo, Claudia Moura, de Almeida, José Antônio Pacheco, Jeraldo, Verónica de Lourdes Sierpe, de Jesus, Amélia Ribeiro
Format:	Journal Article
Language:	English
Published:	Italy PAGEPress Publications 01-09-2012
Subjects:	Agricultural Irrigation Animals Biomphalaria Biomphalaria glabrata, Biomphalaria straminea, Schistosoma mansoni, geographical information system, irrigation, system, natural water sources, Brazil Brazil - epidemiology Confidence Intervals Cross-Sectional Studies Databases, Factual Epidemiologic Studies Geographic Information Systems Humans Infections Irrigation Oryza Prevalence Schistosomiasis mansoni - epidemiology Schistosomiasis mansoni - transmission Snails Statistics, Nonparametric Brazil
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Summary:	The role of irrigated areas for the spread of schistosomiasis is of worldwide concern. The aim of the present study was to investigate the spatial distribution of the intermediate snail host Biomphalaria in an area highly endemic for schistosomiasis due to Schistosoma mansoni, evaluating the relationship between irrigation and types of natural water sources on one hand, and the influence of place and time of water exposure on the intensity of human infection on the other. A geographical information system (GIS) was used to map the distribution of the intermediate snail hosts in Ilha das Flores, Sergipe, Brazil, combined with a clinical/epidemiological survey. We observed a direct correlation between the intensity of human infection with S. mansoni and irrigation projects. Malacological studies to identify snail species and infection rates showed that B. glabrata is the main species responsible for human schistosomiasis in the municipality, but that B. straminea also plays a role. Our results provide evidence for a competitive selection between the two snail species in rice fields with a predominance of B. glabrata in irrigation systems and B. straminea in natural water sources.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1827-1987 1970-7096
DOI:	10.4081/gh.2012.128