A cluster-randomized trial of insecticide-treated curtains for dengue vector control in Thailand

A. Lenhart; Y. Trongtokit; N. Alexander; C. Apiwathnasorn; W. Satimai; V. Vanlerberghe; P. Van der Stuyft; P.J. McCall

doi:10.4269/ajtmh.2012.12-0423

A cluster-randomized trial of insecticide-treated curtains for dengue vector control in Thailand

A. Lenhart, Y. Trongtokit, N. Alexander, C. Apiwathnasorn, W. Satimai, V. Vanlerberghe, P. Van der Stuyft, P.J. McCall

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Abstract

The efficacy of insecticide-treated window curtains (ITCs) for dengue vector control was evaluated in Thailand in a cluster-randomized controlled trial. A total of 2,037 houses in 26 clusters was randomized to receive the intervention or act as control (no treatment). Entomological surveys measured Aedes infestations (Breteau index, house index, container index, and pupae per person index) and oviposition indices (mean numbers of eggs laid in oviposition traps) immediately before and after intervention, and at 3-month intervals over 12 months. There were no consistent statistically significant differences in entomological indices between intervention and control clusters, although oviposition indices were lower (P <0.01) in ITC clusters during the wet season. It is possible that the open housing structures in the study reduced the likelihood of mosquitoes making contact with ITCs. ITCs deployed in a region where this house design is common may be unsuitable for dengue vector control.

Original language	English
Journal	American Journal of Tropical Medicine and Hygiene
Volume	88
Issue number	2
Pages (from-to)	254-259
Number of pages	6
ISSN	0002-9637
DOIs	https://doi.org/10.4269/ajtmh.2012.12-0423
Publication status	Published - 2013

Keywords

Viral diseases
Dengue
Vectors
Mosquitoes
Aedes aegypti
Control strategies
Vector control
Evaluation
Impregnated curtains
Insecticides
Cluster randomized controlled trials
Efficacy
Housing
Thailand
Asia-Southeast

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10.4269/ajtmh.2012.12-0423

2013ajtm0254

http://lib.itg.be/pdf/itg/2013/2013ajtm0254.pdf

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title = "A cluster-randomized trial of insecticide-treated curtains for dengue vector control in Thailand",

abstract = "The efficacy of insecticide-treated window curtains (ITCs) for dengue vector control was evaluated in Thailand in a cluster-randomized controlled trial. A total of 2,037 houses in 26 clusters was randomized to receive the intervention or act as control (no treatment). Entomological surveys measured Aedes infestations (Breteau index, house index, container index, and pupae per person index) and oviposition indices (mean numbers of eggs laid in oviposition traps) immediately before and after intervention, and at 3-month intervals over 12 months. There were no consistent statistically significant differences in entomological indices between intervention and control clusters, although oviposition indices were lower (P <0.01) in ITC clusters during the wet season. It is possible that the open housing structures in the study reduced the likelihood of mosquitoes making contact with ITCs. ITCs deployed in a region where this house design is common may be unsuitable for dengue vector control.",

keywords = "Viral diseases, Dengue, Vectors, Mosquitoes, Aedes aegypti, Control strategies, Vector control, Evaluation, Impregnated curtains, Insecticides, Cluster randomized controlled trials, Efficacy, Housing, Thailand, Asia-Southeast",

author = "A. Lenhart and Y. Trongtokit and N. Alexander and C. Apiwathnasorn and W. Satimai and V. Vanlerberghe and {Van der Stuyft}, P. and P.J. McCall",

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AU - Lenhart, A.

AU - Trongtokit, Y.

AU - Alexander, N.

AU - Apiwathnasorn, C.

AU - Satimai, W.

AU - Vanlerberghe, V.

AU - Van der Stuyft, P.

AU - McCall, P.J.

N1 - FTX; ITG-H6A; ITG-H7A; DPH; U-ECTB: JIF; DOI; PDF; Abstract; DSPACE

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N2 - The efficacy of insecticide-treated window curtains (ITCs) for dengue vector control was evaluated in Thailand in a cluster-randomized controlled trial. A total of 2,037 houses in 26 clusters was randomized to receive the intervention or act as control (no treatment). Entomological surveys measured Aedes infestations (Breteau index, house index, container index, and pupae per person index) and oviposition indices (mean numbers of eggs laid in oviposition traps) immediately before and after intervention, and at 3-month intervals over 12 months. There were no consistent statistically significant differences in entomological indices between intervention and control clusters, although oviposition indices were lower (P <0.01) in ITC clusters during the wet season. It is possible that the open housing structures in the study reduced the likelihood of mosquitoes making contact with ITCs. ITCs deployed in a region where this house design is common may be unsuitable for dengue vector control.

AB - The efficacy of insecticide-treated window curtains (ITCs) for dengue vector control was evaluated in Thailand in a cluster-randomized controlled trial. A total of 2,037 houses in 26 clusters was randomized to receive the intervention or act as control (no treatment). Entomological surveys measured Aedes infestations (Breteau index, house index, container index, and pupae per person index) and oviposition indices (mean numbers of eggs laid in oviposition traps) immediately before and after intervention, and at 3-month intervals over 12 months. There were no consistent statistically significant differences in entomological indices between intervention and control clusters, although oviposition indices were lower (P <0.01) in ITC clusters during the wet season. It is possible that the open housing structures in the study reduced the likelihood of mosquitoes making contact with ITCs. ITCs deployed in a region where this house design is common may be unsuitable for dengue vector control.

KW - Viral diseases

KW - Dengue

KW - Vectors

KW - Mosquitoes

KW - Aedes aegypti

KW - Control strategies

KW - Vector control

KW - Evaluation

KW - Impregnated curtains

KW - Insecticides

KW - Cluster randomized controlled trials

KW - Efficacy

KW - Housing

KW - Thailand

KW - Asia-Southeast

U2 - 10.4269/ajtmh.2012.12-0423

DO - 10.4269/ajtmh.2012.12-0423

M3 - A1: Web of Science-article

C2 - 23166195

SN - 0002-9637

VL - 88

SP - 254

EP - 259

JO - American Journal of Tropical Medicine and Hygiene

JF - American Journal of Tropical Medicine and Hygiene

IS - 2

ER -

A cluster-randomized trial of insecticide-treated curtains for dengue vector control in Thailand

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Keywords

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