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

This paper examines the distribution and infection of Biomphalaria glabrata with Schistosoma mansoni in all aquatic snail habitats in a rural area in the state of Minas Gerais, Brazil, in relation to physico/biotic and behavioral factors. Snail and environmental surveys were carried out semi-annually between July 2001 and November 2002 at 106 sites. Collected snails were examined in the laboratory for infection. B. glabrata densities were highest in overflow ponds, irrigation ponds, springs, canals and wells, and lowest in fishponds and water tanks. Snail densities were higher during the hot, rainy season except for streams and canals and were statistically associated with the presence of fish, pollution, and vegetation density. Tilapia fish and an unidentified Diptera larva were found to be predators of B. glabrata but ducks were not. Twenty-four of the 25 infected snails were collected in 2001(1.4% infection rate) and only one in 2002, after mass chemotherapy. The occurrence of B. glabrata in all 11 snail habitats both at and away from water contact sites studied indicates widespread risk of human infection in the study area. In spite of the strong association between B. glabrata and tilapia in fishponds we do not recommend its use in schistosomiasis control for ecological reasons and its relative inefficiency in streams and dams.

Saved in:
Bibliographic Details
Main Authors: Kloos,Helmut, Passos,Liana Kanovaloff Janotti, LoVerde,Philip, Oliveira,Rodrigo Correa, Gazzinelli,Andréa
Format: Digital revista
Language:English
Published: Instituto Oswaldo Cruz, Ministério da Saúde 2004
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762004000700002
Tags: Add Tag
No Tags, Be the first to tag this record!
id oai:scielo:S0074-02762004000700002
record_format ojs
spelling oai:scielo:S0074-027620040007000022005-01-12Distribution and Schistosoma mansoni infection of Biomphalaria glabrata in different habitats in a rural area in the Jequitinhonha Valley, Minas Gerais, Brazil: environmental and epidemiological aspectsKloos,HelmutPassos,Liana Kanovaloff JanottiLoVerde,PhilipOliveira,Rodrigo CorreaGazzinelli,Andréa Biomphalaria glabrata snail habitats environmental factors tilapia cattle Brazil This paper examines the distribution and infection of Biomphalaria glabrata with Schistosoma mansoni in all aquatic snail habitats in a rural area in the state of Minas Gerais, Brazil, in relation to physico/biotic and behavioral factors. Snail and environmental surveys were carried out semi-annually between July 2001 and November 2002 at 106 sites. Collected snails were examined in the laboratory for infection. B. glabrata densities were highest in overflow ponds, irrigation ponds, springs, canals and wells, and lowest in fishponds and water tanks. Snail densities were higher during the hot, rainy season except for streams and canals and were statistically associated with the presence of fish, pollution, and vegetation density. Tilapia fish and an unidentified Diptera larva were found to be predators of B. glabrata but ducks were not. Twenty-four of the 25 infected snails were collected in 2001(1.4% infection rate) and only one in 2002, after mass chemotherapy. The occurrence of B. glabrata in all 11 snail habitats both at and away from water contact sites studied indicates widespread risk of human infection in the study area. In spite of the strong association between B. glabrata and tilapia in fishponds we do not recommend its use in schistosomiasis control for ecological reasons and its relative inefficiency in streams and dams.info:eu-repo/semantics/openAccessInstituto Oswaldo Cruz, Ministério da SaúdeMemórias do Instituto Oswaldo Cruz v.99 n.7 20042004-11-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762004000700002en10.1590/S0074-02762004000700002
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Kloos,Helmut
Passos,Liana Kanovaloff Janotti
LoVerde,Philip
Oliveira,Rodrigo Correa
Gazzinelli,Andréa
spellingShingle Kloos,Helmut
Passos,Liana Kanovaloff Janotti
LoVerde,Philip
Oliveira,Rodrigo Correa
Gazzinelli,Andréa
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
author_facet Kloos,Helmut
Passos,Liana Kanovaloff Janotti
LoVerde,Philip
Oliveira,Rodrigo Correa
Gazzinelli,Andréa
author_sort Kloos,Helmut
title 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
title_short 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
title_full 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
title_fullStr 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
title_full_unstemmed 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
title_sort 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
description This paper examines the distribution and infection of Biomphalaria glabrata with Schistosoma mansoni in all aquatic snail habitats in a rural area in the state of Minas Gerais, Brazil, in relation to physico/biotic and behavioral factors. Snail and environmental surveys were carried out semi-annually between July 2001 and November 2002 at 106 sites. Collected snails were examined in the laboratory for infection. B. glabrata densities were highest in overflow ponds, irrigation ponds, springs, canals and wells, and lowest in fishponds and water tanks. Snail densities were higher during the hot, rainy season except for streams and canals and were statistically associated with the presence of fish, pollution, and vegetation density. Tilapia fish and an unidentified Diptera larva were found to be predators of B. glabrata but ducks were not. Twenty-four of the 25 infected snails were collected in 2001(1.4% infection rate) and only one in 2002, after mass chemotherapy. The occurrence of B. glabrata in all 11 snail habitats both at and away from water contact sites studied indicates widespread risk of human infection in the study area. In spite of the strong association between B. glabrata and tilapia in fishponds we do not recommend its use in schistosomiasis control for ecological reasons and its relative inefficiency in streams and dams.
publisher Instituto Oswaldo Cruz, Ministério da Saúde
publishDate 2004
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762004000700002
work_keys_str_mv AT klooshelmut distributionandschistosomamansoniinfectionofbiomphalariaglabrataindifferenthabitatsinaruralareainthejequitinhonhavalleyminasgeraisbrazilenvironmentalandepidemiologicalaspects
AT passoslianakanovaloffjanotti distributionandschistosomamansoniinfectionofbiomphalariaglabrataindifferenthabitatsinaruralareainthejequitinhonhavalleyminasgeraisbrazilenvironmentalandepidemiologicalaspects
AT loverdephilip distributionandschistosomamansoniinfectionofbiomphalariaglabrataindifferenthabitatsinaruralareainthejequitinhonhavalleyminasgeraisbrazilenvironmentalandepidemiologicalaspects
AT oliveirarodrigocorrea distributionandschistosomamansoniinfectionofbiomphalariaglabrataindifferenthabitatsinaruralareainthejequitinhonhavalleyminasgeraisbrazilenvironmentalandepidemiologicalaspects
AT gazzinelliandrea distributionandschistosomamansoniinfectionofbiomphalariaglabrataindifferenthabitatsinaruralareainthejequitinhonhavalleyminasgeraisbrazilenvironmentalandepidemiologicalaspects
_version_ 1756383488280363008