Repopulation of breeding habitats of Biomphalaria glabrata after treatment with niclosamide

Detalhes bibliográficos
Autor(a) principal: Souza, Cecília Pereira de
Data de Publicação: 1991
Outros Autores: Mendes, Nelymar Martineli
Tipo de documento: Artigo
Idioma: por
Título da fonte: Revista do Instituto de Medicina Tropical de São Paulo
Texto Completo: https://www.revistas.usp.br/rimtsp/article/view/28838
Resumo: Experiments were undertaken both in the laboratory and in the field between 1980-1984 to evaluate the causes of repopulation of breeding places of Biomphalaria glabrata following treatment with Niclosamide. Laboratory bioassays showed that the susceptibility to emulsifiable Niclosamide of B. glabrata collected monthly from an irrigation ditch system varied during the year. Lethal concentrations (LC90) ranged between 0.15 mg/l-1 and 0.60 mg/l-1. Statistically significant differences (alpha=0.01) were evident between the months of May/82 and January/83 and December/82 and January/83, and were related to snail nutrition. In the field two types of foci of B. glabrata were treated with 10 ppm of Niclosamide. The first one consisted of a reservoir of 12000 1 of water in which 14.5% of snails were infected with Schistosoma mansoni. One application of molluscicide followed by cleaning of the reservoir eliminated all the snails. The second one consisted of an irrigation system in which 5.6% of the snails were infected with S. mansoni. One application of molluscicide without cleaning the ditches reduced the density of snails by 98%. The causes of the survival of 2.0% of the snails in the ditches are discussed in relation to the substratum of the breeding places and the treatment technique.
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spelling Repopulation of breeding habitats of Biomphalaria glabrata after treatment with niclosamide Repovoamento de criadouros de Biomphalaria glabrata após tratamento com niclosamida Controle químicoRepovoamentoCriadourosBiomphalaria glabrata Experiments were undertaken both in the laboratory and in the field between 1980-1984 to evaluate the causes of repopulation of breeding places of Biomphalaria glabrata following treatment with Niclosamide. Laboratory bioassays showed that the susceptibility to emulsifiable Niclosamide of B. glabrata collected monthly from an irrigation ditch system varied during the year. Lethal concentrations (LC90) ranged between 0.15 mg/l-1 and 0.60 mg/l-1. Statistically significant differences (alpha=0.01) were evident between the months of May/82 and January/83 and December/82 and January/83, and were related to snail nutrition. In the field two types of foci of B. glabrata were treated with 10 ppm of Niclosamide. The first one consisted of a reservoir of 12000 1 of water in which 14.5% of snails were infected with Schistosoma mansoni. One application of molluscicide followed by cleaning of the reservoir eliminated all the snails. The second one consisted of an irrigation system in which 5.6% of the snails were infected with S. mansoni. One application of molluscicide without cleaning the ditches reduced the density of snails by 98%. The causes of the survival of 2.0% of the snails in the ditches are discussed in relation to the substratum of the breeding places and the treatment technique. Experimentos foram feitos no laboratório e no campo nos anos de 1980 a 1984, objetivando detectar as causas do repovoamento de criadouros de Biomphalaria glabrata após tratamento com niclosamida. Os bioensaios no laboratório mostraram que a suscetibilidade à niclosamida emulsionável de B. glabrata coletada mensalmente em um sistema de valas de irrigação, variou durante o ano. As concentrações letais CL90 foram 0,15 mgl-1 a 0,60 mgl-1, apresentando diferenças significantes estatisticamente (p < 0,01) nos meses de maio/82 e janeiro/83 e dezcmbro/82 e janciro/83, relacionadas a nutrição. No campo, foram tratados dois tipos de focos com solução aquosa a 10 ppm de niclosamida. O primeiro era formado por reservatório com cerca de 12.000 litros de água e continha 14,5% de moluscos infectados pelo Schistosoma mansoni. Uma única aplicação do produto, seguida de esvaziamento e limpeza do reservatório, eliminou os moluscos. O segundo, era constituído por sistema de valas e poço com 5,6% de moluscos infectados por S. mansoni. Uma única aplicação do produto, sem limpeza das valas, reduziu a densidade planorbídica 98%. As causas da sobrevivência de 2% dos moluscos do sistema de valas, são discutidas, sendo relacionadas ao substrato do criadouro e a técnica utilizada no tratamento. Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo1991-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/rimtsp/article/view/28838Revista do Instituto de Medicina Tropical de São Paulo; Vol. 33 No. 4 (1991); 297-302 Revista do Instituto de Medicina Tropical de São Paulo; Vol. 33 Núm. 4 (1991); 297-302 Revista do Instituto de Medicina Tropical de São Paulo; v. 33 n. 4 (1991); 297-302 1678-99460036-4665reponame:Revista do Instituto de Medicina Tropical de São Pauloinstname:Instituto de Medicina Tropical (IMT)instacron:IMTporhttps://www.revistas.usp.br/rimtsp/article/view/28838/30691Copyright (c) 2018 Revista do Instituto de Medicina Tropical de São Pauloinfo:eu-repo/semantics/openAccessSouza, Cecília Pereira deMendes, Nelymar Martineli2012-07-02T01:30:46Zoai:revistas.usp.br:article/28838Revistahttp://www.revistas.usp.br/rimtsp/indexPUBhttps://www.revistas.usp.br/rimtsp/oai||revimtsp@usp.br1678-99460036-4665opendoar:2022-12-13T16:50:36.325494Revista do Instituto de Medicina Tropical de São Paulo - Instituto de Medicina Tropical (IMT)true
dc.title.none.fl_str_mv Repopulation of breeding habitats of Biomphalaria glabrata after treatment with niclosamide
Repovoamento de criadouros de Biomphalaria glabrata após tratamento com niclosamida
title Repopulation of breeding habitats of Biomphalaria glabrata after treatment with niclosamide
spellingShingle Repopulation of breeding habitats of Biomphalaria glabrata after treatment with niclosamide
Souza, Cecília Pereira de
Controle químico
Repovoamento
Criadouros
Biomphalaria glabrata
title_short Repopulation of breeding habitats of Biomphalaria glabrata after treatment with niclosamide
title_full Repopulation of breeding habitats of Biomphalaria glabrata after treatment with niclosamide
title_fullStr Repopulation of breeding habitats of Biomphalaria glabrata after treatment with niclosamide
title_full_unstemmed Repopulation of breeding habitats of Biomphalaria glabrata after treatment with niclosamide
title_sort Repopulation of breeding habitats of Biomphalaria glabrata after treatment with niclosamide
author Souza, Cecília Pereira de
author_facet Souza, Cecília Pereira de
Mendes, Nelymar Martineli
author_role author
author2 Mendes, Nelymar Martineli
author2_role author
dc.contributor.author.fl_str_mv Souza, Cecília Pereira de
Mendes, Nelymar Martineli
dc.subject.por.fl_str_mv Controle químico
Repovoamento
Criadouros
Biomphalaria glabrata
topic Controle químico
Repovoamento
Criadouros
Biomphalaria glabrata
description Experiments were undertaken both in the laboratory and in the field between 1980-1984 to evaluate the causes of repopulation of breeding places of Biomphalaria glabrata following treatment with Niclosamide. Laboratory bioassays showed that the susceptibility to emulsifiable Niclosamide of B. glabrata collected monthly from an irrigation ditch system varied during the year. Lethal concentrations (LC90) ranged between 0.15 mg/l-1 and 0.60 mg/l-1. Statistically significant differences (alpha=0.01) were evident between the months of May/82 and January/83 and December/82 and January/83, and were related to snail nutrition. In the field two types of foci of B. glabrata were treated with 10 ppm of Niclosamide. The first one consisted of a reservoir of 12000 1 of water in which 14.5% of snails were infected with Schistosoma mansoni. One application of molluscicide followed by cleaning of the reservoir eliminated all the snails. The second one consisted of an irrigation system in which 5.6% of the snails were infected with S. mansoni. One application of molluscicide without cleaning the ditches reduced the density of snails by 98%. The causes of the survival of 2.0% of the snails in the ditches are discussed in relation to the substratum of the breeding places and the treatment technique.
publishDate 1991
dc.date.none.fl_str_mv 1991-08-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://www.revistas.usp.br/rimtsp/article/view/28838
url https://www.revistas.usp.br/rimtsp/article/view/28838
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://www.revistas.usp.br/rimtsp/article/view/28838/30691
dc.rights.driver.fl_str_mv Copyright (c) 2018 Revista do Instituto de Medicina Tropical de São Paulo
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2018 Revista do Instituto de Medicina Tropical de São Paulo
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo
publisher.none.fl_str_mv Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo
dc.source.none.fl_str_mv Revista do Instituto de Medicina Tropical de São Paulo; Vol. 33 No. 4 (1991); 297-302
Revista do Instituto de Medicina Tropical de São Paulo; Vol. 33 Núm. 4 (1991); 297-302
Revista do Instituto de Medicina Tropical de São Paulo; v. 33 n. 4 (1991); 297-302
1678-9946
0036-4665
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reponame_str Revista do Instituto de Medicina Tropical de São Paulo
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