Efficacy of Aedes aegypti control by indoor Ultra Low Volume (ULV) insecticide spraying in Iquitos, Peru.
Background Aedes aegypti is a primary vector of dengue, chikungunya, Zika, and urban yellow fever viruses. Indoor, ultra low volume (ULV) space spraying with pyrethroid insecticides is the main approach used for Ae. aegypti emergency control in many countries. Given the widespread use of this method...
Published in: | PLOS Neglected Tropical Diseases |
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ftdoajarticles:oai:doaj.org/article:d9db20f43d974060bccf2f5a00367db9 2023-05-15T15:15:12+02:00 Efficacy of Aedes aegypti control by indoor Ultra Low Volume (ULV) insecticide spraying in Iquitos, Peru. Christian E Gunning Kenichi W Okamoto Helvio Astete Gissella M Vasquez Erik Erhardt Clara Del Aguila Raul Pinedo Roldan Cardenas Carlos Pacheco Enrique Chalco Hugo Rodriguez-Ferruci Thomas W Scott Alun L Lloyd Fred Gould Amy C Morrison 2018-04-01T00:00:00Z https://doi.org/10.1371/journal.pntd.0006378 https://doaj.org/article/d9db20f43d974060bccf2f5a00367db9 EN eng Public Library of Science (PLoS) https://doi.org/10.1371/journal.pntd.0006378 https://doaj.org/toc/1935-2727 https://doaj.org/toc/1935-2735 1935-2727 1935-2735 doi:10.1371/journal.pntd.0006378 https://doaj.org/article/d9db20f43d974060bccf2f5a00367db9 PLoS Neglected Tropical Diseases, Vol 12, Iss 4, p e0006378 (2018) Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 article 2018 ftdoajarticles https://doi.org/10.1371/journal.pntd.0006378 2022-12-31T13:48:02Z Background Aedes aegypti is a primary vector of dengue, chikungunya, Zika, and urban yellow fever viruses. Indoor, ultra low volume (ULV) space spraying with pyrethroid insecticides is the main approach used for Ae. aegypti emergency control in many countries. Given the widespread use of this method, the lack of large-scale experiments or detailed evaluations of municipal spray programs is problematic. Methodology/principal findings Two experimental evaluations of non-residual, indoor ULV pyrethroid spraying were conducted in Iquitos, Peru. In each, a central sprayed sector was surrounded by an unsprayed buffer sector. In 2013, spray and buffer sectors included 398 and 765 houses, respectively. Spraying reduced the mean number of adults captured per house by ~83 percent relative to the pre-spray baseline survey. In the 2014 experiment, sprayed and buffer sectors included 1,117 and 1,049 houses, respectively. Here, the sprayed sector's number of adults per house was reduced ~64 percent relative to baseline. Parity surveys in the sprayed sector during the 2014 spray period indicated an increase in the proportion of very young females. We also evaluated impacts of a 2014 citywide spray program by the local Ministry of Health, which reduced adult populations by ~60 percent. In all cases, adult densities returned to near-baseline levels within one month. Conclusions/significance Our results demonstrate that densities of adult Ae. aegypti can be reduced by experimental and municipal spraying programs. The finding that adult densities return to approximately pre-spray densities in less than a month is similar to results from previous, smaller scale experiments. Our results demonstrate that ULV spraying is best viewed as having a short-term entomological effect. The epidemiological impact of ULV spraying will need evaluation in future trials that measure capacity of insecticide spraying to reduce human infection or disease. Article in Journal/Newspaper Arctic ulv Directory of Open Access Journals: DOAJ Articles Arctic PLOS Neglected Tropical Diseases 12 4 e0006378 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
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 Christian E Gunning Kenichi W Okamoto Helvio Astete Gissella M Vasquez Erik Erhardt Clara Del Aguila Raul Pinedo Roldan Cardenas Carlos Pacheco Enrique Chalco Hugo Rodriguez-Ferruci Thomas W Scott Alun L Lloyd Fred Gould Amy C Morrison Efficacy of Aedes aegypti control by indoor Ultra Low Volume (ULV) insecticide spraying in Iquitos, Peru. |
topic_facet |
Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 |
description |
Background Aedes aegypti is a primary vector of dengue, chikungunya, Zika, and urban yellow fever viruses. Indoor, ultra low volume (ULV) space spraying with pyrethroid insecticides is the main approach used for Ae. aegypti emergency control in many countries. Given the widespread use of this method, the lack of large-scale experiments or detailed evaluations of municipal spray programs is problematic. Methodology/principal findings Two experimental evaluations of non-residual, indoor ULV pyrethroid spraying were conducted in Iquitos, Peru. In each, a central sprayed sector was surrounded by an unsprayed buffer sector. In 2013, spray and buffer sectors included 398 and 765 houses, respectively. Spraying reduced the mean number of adults captured per house by ~83 percent relative to the pre-spray baseline survey. In the 2014 experiment, sprayed and buffer sectors included 1,117 and 1,049 houses, respectively. Here, the sprayed sector's number of adults per house was reduced ~64 percent relative to baseline. Parity surveys in the sprayed sector during the 2014 spray period indicated an increase in the proportion of very young females. We also evaluated impacts of a 2014 citywide spray program by the local Ministry of Health, which reduced adult populations by ~60 percent. In all cases, adult densities returned to near-baseline levels within one month. Conclusions/significance Our results demonstrate that densities of adult Ae. aegypti can be reduced by experimental and municipal spraying programs. The finding that adult densities return to approximately pre-spray densities in less than a month is similar to results from previous, smaller scale experiments. Our results demonstrate that ULV spraying is best viewed as having a short-term entomological effect. The epidemiological impact of ULV spraying will need evaluation in future trials that measure capacity of insecticide spraying to reduce human infection or disease. |
format |
Article in Journal/Newspaper |
author |
Christian E Gunning Kenichi W Okamoto Helvio Astete Gissella M Vasquez Erik Erhardt Clara Del Aguila Raul Pinedo Roldan Cardenas Carlos Pacheco Enrique Chalco Hugo Rodriguez-Ferruci Thomas W Scott Alun L Lloyd Fred Gould Amy C Morrison |
author_facet |
Christian E Gunning Kenichi W Okamoto Helvio Astete Gissella M Vasquez Erik Erhardt Clara Del Aguila Raul Pinedo Roldan Cardenas Carlos Pacheco Enrique Chalco Hugo Rodriguez-Ferruci Thomas W Scott Alun L Lloyd Fred Gould Amy C Morrison |
author_sort |
Christian E Gunning |
title |
Efficacy of Aedes aegypti control by indoor Ultra Low Volume (ULV) insecticide spraying in Iquitos, Peru. |
title_short |
Efficacy of Aedes aegypti control by indoor Ultra Low Volume (ULV) insecticide spraying in Iquitos, Peru. |
title_full |
Efficacy of Aedes aegypti control by indoor Ultra Low Volume (ULV) insecticide spraying in Iquitos, Peru. |
title_fullStr |
Efficacy of Aedes aegypti control by indoor Ultra Low Volume (ULV) insecticide spraying in Iquitos, Peru. |
title_full_unstemmed |
Efficacy of Aedes aegypti control by indoor Ultra Low Volume (ULV) insecticide spraying in Iquitos, Peru. |
title_sort |
efficacy of aedes aegypti control by indoor ultra low volume (ulv) insecticide spraying in iquitos, peru. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2018 |
url |
https://doi.org/10.1371/journal.pntd.0006378 https://doaj.org/article/d9db20f43d974060bccf2f5a00367db9 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic ulv |
genre_facet |
Arctic ulv |
op_source |
PLoS Neglected Tropical Diseases, Vol 12, Iss 4, p e0006378 (2018) |
op_relation |
https://doi.org/10.1371/journal.pntd.0006378 https://doaj.org/toc/1935-2727 https://doaj.org/toc/1935-2735 1935-2727 1935-2735 doi:10.1371/journal.pntd.0006378 https://doaj.org/article/d9db20f43d974060bccf2f5a00367db9 |
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https://doi.org/10.1371/journal.pntd.0006378 |
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PLOS Neglected Tropical Diseases |
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12 |
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4 |
container_start_page |
e0006378 |
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