Schistosomiasis mansoni in Bananal (State of São Paulo, Brazil): II. Intermediate hosts
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Memórias do Instituto Oswaldo Cruz |
Texto Completo: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762002000900009 |
Resumo: | We conducted monthly snail captures in Bananal, State of São Paulo, Brazil, between March 1998 and February 2001, to identify Schistosoma mansoni vectors, estimate seasonal population changes, and delimit foci. We also evaluated the impact of improvements in city water supply and basic sanitation facilities. We identified 28,651 vector specimens, 28,438 as Biomphalaria tenagophila, 49 of them (0.2%) infected with S. mansoni, and 213 as B. straminea, none of the latter infected. Vectors predominated in water bodies having some vegetation along their banks. Neither population density nor local vegetation could be linked to vector infection. We found the first infected snails in 1998 (from March to May). Further captures of infected snails ocurred, without exception, from July to December, when rainfall was least. Irrespective of season, overall temperature ranged from 16.5ºC to 21ºC; pH values, from 6.0 to 6.8. Neither factor was associated with snail population density. Frequent contact of people with the river result from wading across it, extracting sand from its bottom, fishing, washing animals, etc. Despite a marked reduction in contamination, cercaria shedding persists. Whatever the location along its urban course, contact with river Bananal, particularly of the unprotected skin, entails risks of infection. |
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Schistosomiasis mansoni in Bananal (State of São Paulo, Brazil): II. Intermediate hostsBiomphalaria tenagophilaseasonalitySchistosoma mansonitransmissionSão PauloBrazilWe conducted monthly snail captures in Bananal, State of São Paulo, Brazil, between March 1998 and February 2001, to identify Schistosoma mansoni vectors, estimate seasonal population changes, and delimit foci. We also evaluated the impact of improvements in city water supply and basic sanitation facilities. We identified 28,651 vector specimens, 28,438 as Biomphalaria tenagophila, 49 of them (0.2%) infected with S. mansoni, and 213 as B. straminea, none of the latter infected. Vectors predominated in water bodies having some vegetation along their banks. Neither population density nor local vegetation could be linked to vector infection. We found the first infected snails in 1998 (from March to May). Further captures of infected snails ocurred, without exception, from July to December, when rainfall was least. Irrespective of season, overall temperature ranged from 16.5ºC to 21ºC; pH values, from 6.0 to 6.8. Neither factor was associated with snail population density. Frequent contact of people with the river result from wading across it, extracting sand from its bottom, fishing, washing animals, etc. Despite a marked reduction in contamination, cercaria shedding persists. Whatever the location along its urban course, contact with river Bananal, particularly of the unprotected skin, entails risks of infection.Instituto Oswaldo Cruz, Ministério da Saúde2002-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762002000900009Memórias do Instituto Oswaldo Cruz v.97 suppl.1 2002reponame:Memórias do Instituto Oswaldo Cruzinstname:Fundação Oswaldo Cruzinstacron:FIOCRUZ10.1590/S0074-02762002000900009info:eu-repo/semantics/openAccessTeles,Horacio Manuel SantanaFerreira,Cláudio SantosCarvalho,Maria Esther deLima,Valquíria Rosa deZacharias,Fabianaeng2020-04-25T17:48:58Zhttp://www.scielo.br/oai/scielo-oai.php0074-02761678-8060opendoar:null2020-04-26 02:11:34.089Memórias do Instituto Oswaldo Cruz - Fundação Oswaldo Cruztrue |
dc.title.none.fl_str_mv |
Schistosomiasis mansoni in Bananal (State of São Paulo, Brazil): II. Intermediate hosts |
title |
Schistosomiasis mansoni in Bananal (State of São Paulo, Brazil): II. Intermediate hosts |
spellingShingle |
Schistosomiasis mansoni in Bananal (State of São Paulo, Brazil): II. Intermediate hosts Teles,Horacio Manuel Santana Biomphalaria tenagophila seasonality Schistosoma mansoni transmission São Paulo Brazil |
title_short |
Schistosomiasis mansoni in Bananal (State of São Paulo, Brazil): II. Intermediate hosts |
title_full |
Schistosomiasis mansoni in Bananal (State of São Paulo, Brazil): II. Intermediate hosts |
title_fullStr |
Schistosomiasis mansoni in Bananal (State of São Paulo, Brazil): II. Intermediate hosts |
title_full_unstemmed |
Schistosomiasis mansoni in Bananal (State of São Paulo, Brazil): II. Intermediate hosts |
title_sort |
Schistosomiasis mansoni in Bananal (State of São Paulo, Brazil): II. Intermediate hosts |
author |
Teles,Horacio Manuel Santana |
author_facet |
Teles,Horacio Manuel Santana Ferreira,Cláudio Santos Carvalho,Maria Esther de Lima,Valquíria Rosa de Zacharias,Fabiana |
author_role |
author |
author2 |
Ferreira,Cláudio Santos Carvalho,Maria Esther de Lima,Valquíria Rosa de Zacharias,Fabiana |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Teles,Horacio Manuel Santana Ferreira,Cláudio Santos Carvalho,Maria Esther de Lima,Valquíria Rosa de Zacharias,Fabiana |
dc.subject.por.fl_str_mv |
Biomphalaria tenagophila seasonality Schistosoma mansoni transmission São Paulo Brazil |
topic |
Biomphalaria tenagophila seasonality Schistosoma mansoni transmission São Paulo Brazil |
dc.description.none.fl_txt_mv |
We conducted monthly snail captures in Bananal, State of São Paulo, Brazil, between March 1998 and February 2001, to identify Schistosoma mansoni vectors, estimate seasonal population changes, and delimit foci. We also evaluated the impact of improvements in city water supply and basic sanitation facilities. We identified 28,651 vector specimens, 28,438 as Biomphalaria tenagophila, 49 of them (0.2%) infected with S. mansoni, and 213 as B. straminea, none of the latter infected. Vectors predominated in water bodies having some vegetation along their banks. Neither population density nor local vegetation could be linked to vector infection. We found the first infected snails in 1998 (from March to May). Further captures of infected snails ocurred, without exception, from July to December, when rainfall was least. Irrespective of season, overall temperature ranged from 16.5ºC to 21ºC; pH values, from 6.0 to 6.8. Neither factor was associated with snail population density. Frequent contact of people with the river result from wading across it, extracting sand from its bottom, fishing, washing animals, etc. Despite a marked reduction in contamination, cercaria shedding persists. Whatever the location along its urban course, contact with river Bananal, particularly of the unprotected skin, entails risks of infection. |
description |
We conducted monthly snail captures in Bananal, State of São Paulo, Brazil, between March 1998 and February 2001, to identify Schistosoma mansoni vectors, estimate seasonal population changes, and delimit foci. We also evaluated the impact of improvements in city water supply and basic sanitation facilities. We identified 28,651 vector specimens, 28,438 as Biomphalaria tenagophila, 49 of them (0.2%) infected with S. mansoni, and 213 as B. straminea, none of the latter infected. Vectors predominated in water bodies having some vegetation along their banks. Neither population density nor local vegetation could be linked to vector infection. We found the first infected snails in 1998 (from March to May). Further captures of infected snails ocurred, without exception, from July to December, when rainfall was least. Irrespective of season, overall temperature ranged from 16.5ºC to 21ºC; pH values, from 6.0 to 6.8. Neither factor was associated with snail population density. Frequent contact of people with the river result from wading across it, extracting sand from its bottom, fishing, washing animals, etc. Despite a marked reduction in contamination, cercaria shedding persists. Whatever the location along its urban course, contact with river Bananal, particularly of the unprotected skin, entails risks of infection. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-10-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762002000900009 |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762002000900009 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0074-02762002000900009 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Instituto Oswaldo Cruz, Ministério da Saúde |
publisher.none.fl_str_mv |
Instituto Oswaldo Cruz, Ministério da Saúde |
dc.source.none.fl_str_mv |
Memórias do Instituto Oswaldo Cruz v.97 suppl.1 2002 reponame:Memórias do Instituto Oswaldo Cruz instname:Fundação Oswaldo Cruz instacron:FIOCRUZ |
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Memórias do Instituto Oswaldo Cruz |
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Memórias do Instituto Oswaldo Cruz |
instname_str |
Fundação Oswaldo Cruz |
instacron_str |
FIOCRUZ |
institution |
FIOCRUZ |
repository.name.fl_str_mv |
Memórias do Instituto Oswaldo Cruz - Fundação Oswaldo Cruz |
repository.mail.fl_str_mv |
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