High resurgence of dengue vector populations after space spraying in an endemic urban area of Thailand: A cluster randomized controlled trial
Objective: To examine the resurgence rate, house density index (HDI) and parous rate of the Aedes aegypti vector after space spraying carried out by the routine spraying team, and compare with the rates after standard indoor ultra low volume (SID-ULV) spraying carried out by the trained research spr...
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Wolters Kluwer Medknow Publications
2015-11-01
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doaj-4c80657a427c4392b202c8ecc16db6f82020-11-24T23:20:58ZengWolters Kluwer Medknow PublicationsAsian Pacific Journal of Tropical Biomedicine2221-16912015-11-0151196597010.1016/j.apjtb.2015.07.022High resurgence of dengue vector populations after space spraying in an endemic urban area of Thailand: A cluster randomized controlled trialNapadol Sudsom0Kuaanan Techato1Suwich Thammapalo2Virasakdi Chongsuvivatwong3Theerakamol Pengsakul4Faculty of Environmental Management, Prince of Songkla University, Hatyai, Songkhla 90110, ThailandFaculty of Environmental Management, Prince of Songkla University, Hatyai, Songkhla 90110, ThailandOffice of Disease Prevention and Control, 12 Songkhla, ThailandEpidemiology Unit, Faculty of Medicine, Prince of Songkla University, Hatyai, Songkhla 90110, ThailandFaculty of Medical Technology, Prince of Songkla University, Hatyai, Songkhla 90110, ThailandObjective: To examine the resurgence rate, house density index (HDI) and parous rate of the Aedes aegypti vector after space spraying carried out by the routine spraying team, and compare with the rates after standard indoor ultra low volume (SID-ULV) spraying carried out by the trained research spraying team. Methods: Between March and September 2014, a cluster randomized controlled trial including 12 clusters (6 regular ULV, 6 SID-ULV) with totally 4341 households was conducted, and around 20–31 houses in each cluster were selected for assessment. The parous rate and HDI of collected mosquitoes 2 days before and 1, 2 and 6 days after spraying were obtained and compared. Results: The HDI dropped significantly from the baseline 1 and 2 days after spraying to a non-zero value in the SID-ULV treated locations but not in the regular ULV group locations. However, by 6 days after spraying, the HDI of both groups had returned to the base value measured 2 days before spraying. There were no statistically significant differences in the parous rate between groups. Conclusions: SID-ULV is more effective in reducing Aedes aegypti populations. However, rapid resurgence of dengue vector after spraying in urban areas was observed in both groups.http://www.sciencedirect.com/science/article/pii/S2221169115001896Aedes aegyptiCluster randomized controlled trialDengueSpace sprayingUltra low volume |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Napadol Sudsom Kuaanan Techato Suwich Thammapalo Virasakdi Chongsuvivatwong Theerakamol Pengsakul |
spellingShingle |
Napadol Sudsom Kuaanan Techato Suwich Thammapalo Virasakdi Chongsuvivatwong Theerakamol Pengsakul High resurgence of dengue vector populations after space spraying in an endemic urban area of Thailand: A cluster randomized controlled trial Asian Pacific Journal of Tropical Biomedicine Aedes aegypti Cluster randomized controlled trial Dengue Space spraying Ultra low volume |
author_facet |
Napadol Sudsom Kuaanan Techato Suwich Thammapalo Virasakdi Chongsuvivatwong Theerakamol Pengsakul |
author_sort |
Napadol Sudsom |
title |
High resurgence of dengue vector populations after space spraying in an endemic urban area of Thailand: A cluster randomized controlled trial |
title_short |
High resurgence of dengue vector populations after space spraying in an endemic urban area of Thailand: A cluster randomized controlled trial |
title_full |
High resurgence of dengue vector populations after space spraying in an endemic urban area of Thailand: A cluster randomized controlled trial |
title_fullStr |
High resurgence of dengue vector populations after space spraying in an endemic urban area of Thailand: A cluster randomized controlled trial |
title_full_unstemmed |
High resurgence of dengue vector populations after space spraying in an endemic urban area of Thailand: A cluster randomized controlled trial |
title_sort |
high resurgence of dengue vector populations after space spraying in an endemic urban area of thailand: a cluster randomized controlled trial |
publisher |
Wolters Kluwer Medknow Publications |
series |
Asian Pacific Journal of Tropical Biomedicine |
issn |
2221-1691 |
publishDate |
2015-11-01 |
description |
Objective: To examine the resurgence rate, house density index (HDI) and parous rate of the Aedes aegypti vector after space spraying carried out by the routine spraying team, and compare with the rates after standard indoor ultra low volume (SID-ULV) spraying carried out by the trained research spraying team.
Methods: Between March and September 2014, a cluster randomized controlled trial including 12 clusters (6 regular ULV, 6 SID-ULV) with totally 4341 households was conducted, and around 20–31 houses in each cluster were selected for assessment. The parous rate and HDI of collected mosquitoes 2 days before and 1, 2 and 6 days after spraying were obtained and compared.
Results: The HDI dropped significantly from the baseline 1 and 2 days after spraying to a non-zero value in the SID-ULV treated locations but not in the regular ULV group locations. However, by 6 days after spraying, the HDI of both groups had returned to the base value measured 2 days before spraying. There were no statistically significant differences in the parous rate between groups.
Conclusions: SID-ULV is more effective in reducing Aedes aegypti populations. However, rapid resurgence of dengue vector after spraying in urban areas was observed in both groups. |
topic |
Aedes aegypti Cluster randomized controlled trial Dengue Space spraying Ultra low volume |
url |
http://www.sciencedirect.com/science/article/pii/S2221169115001896 |
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