Evaluation of the effectiveness of insecticide treated materials for household level dengue vector control.

<h4>Objective</h4>To assess the operational effectiveness of long-lasting insecticide treated materials (ITMs), when used at household level, for the control of Aedes aegypti in moderately infested urban and suburban areas.<h4>Methods</h4>In an intervention study, ITMs consis...

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Autores principales:	Veerle Vanlerberghe, Elci Villegas, Milagros Oviedo, Alberto Baly, Audrey Lenhart, P J McCall, Patrick Van der Stuyft
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270
Acceso en línea:	https://doaj.org/article/652297662c9745dabaa327e4fa2232be
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spelling	oai:doaj.org-article:652297662c9745dabaa327e4fa2232be2021-11-18T09:13:29ZEvaluation of the effectiveness of insecticide treated materials for household level dengue vector control.1935-27271935-273510.1371/journal.pntd.0000994https://doaj.org/article/652297662c9745dabaa327e4fa2232be2011-03-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21468313/?tool=EBIhttps://doaj.org/toc/1935-2727https://doaj.org/toc/1935-2735<h4>Objective</h4>To assess the operational effectiveness of long-lasting insecticide treated materials (ITMs), when used at household level, for the control of Aedes aegypti in moderately infested urban and suburban areas.<h4>Methods</h4>In an intervention study, ITMs consisting of curtains and water jar-covers (made from PermaNet) were distributed under routine field conditions in 10 clusters (5 urban and 5 suburban), with over 4000 houses, in Trujillo, Venezuela. Impact of the interventions were determined by comparing pre-and post-intervention measures of the Breteau index (BI, number of positive containers/100 houses) and pupae per person index (PPI), and by comparison with indices from untreated areas of the same municipalities. The effect of ITM coverage was modeled.<h4>Results</h4>At distribution, the proportion of households with ≥1 ITM curtain was 79.7% in urban and 75.2% in suburban clusters, but decreased to 32.3% and 39.0%, respectively, after 18 months. The corresponding figures for the proportion of jars using ITM covers were 34.0% and 50.8% at distribution and 17.0% and 21.0% after 18 months, respectively. Prior to intervention, the BI was 8.5 in urban clusters and 42.4 in suburban clusters, and the PPI was 0.2 and 0.9, respectively. In both urban and suburban clusters, the BI showed a sustained 55% decrease, while no discernable pattern was observed at the municipal level. After controlling for confounding factors, the percentage ITM curtain coverage, but not ITM jar-cover coverage, was significantly associated with both entomological indices (Incidence Rate Ratio = 0.98; 95%CI 0.97-0.99). The IRR implied that ITM curtain coverage of at least 50% was necessary to reduce A. aegypti infestation levels by 50%.<h4>Conclusion</h4>Deployment of insecticide treated window curtains in households can result in significant reductions in A. aegypti levels when dengue vector infestations are moderate, but the magnitude of the effect depends on the coverage attained, which itself can decline rapidly over time.Veerle VanlerbergheElci VillegasMilagros OviedoAlberto BalyAudrey LenhartP J McCallPatrick Van der StuyftPublic Library of Science (PLoS)articleArctic medicine. Tropical medicineRC955-962Public aspects of medicineRA1-1270ENPLoS Neglected Tropical Diseases, Vol 5, Iss 3, p e994 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270
spellingShingle	Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 Veerle Vanlerberghe Elci Villegas Milagros Oviedo Alberto Baly Audrey Lenhart P J McCall Patrick Van der Stuyft Evaluation of the effectiveness of insecticide treated materials for household level dengue vector control.
description	<h4>Objective</h4>To assess the operational effectiveness of long-lasting insecticide treated materials (ITMs), when used at household level, for the control of Aedes aegypti in moderately infested urban and suburban areas.<h4>Methods</h4>In an intervention study, ITMs consisting of curtains and water jar-covers (made from PermaNet) were distributed under routine field conditions in 10 clusters (5 urban and 5 suburban), with over 4000 houses, in Trujillo, Venezuela. Impact of the interventions were determined by comparing pre-and post-intervention measures of the Breteau index (BI, number of positive containers/100 houses) and pupae per person index (PPI), and by comparison with indices from untreated areas of the same municipalities. The effect of ITM coverage was modeled.<h4>Results</h4>At distribution, the proportion of households with ≥1 ITM curtain was 79.7% in urban and 75.2% in suburban clusters, but decreased to 32.3% and 39.0%, respectively, after 18 months. The corresponding figures for the proportion of jars using ITM covers were 34.0% and 50.8% at distribution and 17.0% and 21.0% after 18 months, respectively. Prior to intervention, the BI was 8.5 in urban clusters and 42.4 in suburban clusters, and the PPI was 0.2 and 0.9, respectively. In both urban and suburban clusters, the BI showed a sustained 55% decrease, while no discernable pattern was observed at the municipal level. After controlling for confounding factors, the percentage ITM curtain coverage, but not ITM jar-cover coverage, was significantly associated with both entomological indices (Incidence Rate Ratio = 0.98; 95%CI 0.97-0.99). The IRR implied that ITM curtain coverage of at least 50% was necessary to reduce A. aegypti infestation levels by 50%.<h4>Conclusion</h4>Deployment of insecticide treated window curtains in households can result in significant reductions in A. aegypti levels when dengue vector infestations are moderate, but the magnitude of the effect depends on the coverage attained, which itself can decline rapidly over time.
format	article
author	Veerle Vanlerberghe Elci Villegas Milagros Oviedo Alberto Baly Audrey Lenhart P J McCall Patrick Van der Stuyft
author_facet	Veerle Vanlerberghe Elci Villegas Milagros Oviedo Alberto Baly Audrey Lenhart P J McCall Patrick Van der Stuyft
author_sort	Veerle Vanlerberghe
title	Evaluation of the effectiveness of insecticide treated materials for household level dengue vector control.
title_short	Evaluation of the effectiveness of insecticide treated materials for household level dengue vector control.
title_full	Evaluation of the effectiveness of insecticide treated materials for household level dengue vector control.
title_fullStr	Evaluation of the effectiveness of insecticide treated materials for household level dengue vector control.
title_full_unstemmed	Evaluation of the effectiveness of insecticide treated materials for household level dengue vector control.
title_sort	evaluation of the effectiveness of insecticide treated materials for household level dengue vector control.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/652297662c9745dabaa327e4fa2232be
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Evaluation of the effectiveness of insecticide treated materials for household level dengue vector control.

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