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1. Rojas de Arias A, Lehane MJ, Schofield CJ, Maldonado M: Pyrethroid insecticide evaluation on different house structures in a Chagas disease endemic area of the Paraguayan Chaco. Mem Inst Oswaldo Cruz; 2004 Oct;99(6):657-62
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  • [Source] The source of this record is MEDLINE®, a database of the U.S. National Library of Medicine.
  • [Title] Pyrethroid insecticide evaluation on different house structures in a Chagas disease endemic area of the Paraguayan Chaco.
  • Insecticide effects of deltamethrin 2.5% SC (flowable solution) on different substrates and triatomine infestation rates in two indigenous villages (Estancia Salzar and Nueva Promesa) of the Paraguayan Chaco are reported.
  • This field study was carried out to determine the extent to which variability in spray penetration may affect residual action of the insecticide.
  • A total of 117 houses in the two villages were sprayed.
  • Filter papers discs were placed on aluminium foil pinned to walls and roofs in selected houses and the applied insecticide concentration was determined by high pressure liquid chromatography (HPLC).
  • The target dose rate was 25 mg a.i./m2.
  • The mean actual applied dose in Estancia Salazar was 11.2 +/- 3.1 mg a.i.
  • /m2 in walls and 11.9 +/- 5.6 mg a.i.
  • /m2 in roofs while in Nueva Promesa, where duplicates were carried out, the mean values were 19.9 +/- 6.9 mg a.i.
  • /m2 and 34.7 +/- 10.4 mg a.i.
  • /m2 in walls and 28.8 +/- 19.2 mg a.i.
  • /m2 and 24.9 +/- 21.8 mg a.i. /m2 in roofs.
  • This shows the unevenness and variability of applied doses during spraying campaigns, and also the reduced coverage over roof surfaces.
  • However, wall bioassays with Triatoma infestans nymphs in a 72 h exposure test showed that deposits of deltamethrin persisted in quantities sufficient to kill triatomines until three months post spraying.
  • Knockdown by deltamethrin on both types of surfaces resulted in 100% final mortality.
  • A lower insecticidal effect was observed on mud walls.
  • However, three months after treatment, sprayed lime-coated mud surfaces displayed a twofold greater capacity (57.5%) to kill triatomines than mud sprayed surfaces (25%).
  • Re-infestation was detected by manual capture only in one locality, six months after spraying.
  • [MeSH-major] Insect Control / methods. Insect Vectors / drug effects. Insecticides / analysis. Pyrethrins / analysis. Triatoma / drug effects
  • [MeSH-minor] Animals. Chagas Disease / epidemiology. Chagas Disease / transmission. Drug Evaluation. Endemic Diseases / prevention & control. Housing. Humans. Nitriles. Paraguay / epidemiology

  • Genetic Alliance. consumer health - Chagas Disease.
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  • (PMID = 15558181.001).
  • [ISSN] 0074-0276
  • [Journal-full-title] MemoĢrias do Instituto Oswaldo Cruz
  • [ISO-abbreviation] Mem. Inst. Oswaldo Cruz
  • [Language] eng
  • [Publication-type] Journal Article; Research Support, Non-U.S. Gov't
  • [Publication-country] Brazil
  • [Chemical-registry-number] 0 / Insecticides; 0 / Nitriles; 0 / Pyrethrins; 2JTS8R821G / decamethrin
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