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Impact of outdoor residual spraying on the biting rate of malaria vectors: A pilot study in four villages in Kayin state, Myanmar
Outdoor and early mosquito biters challenge the efficacy of bed-nets and indoor residual spraying on the Thailand-Myanmar border. Outdoor residual spraying is proposed for the control of exophilic mosquito species. The objective of this study was to assess the impact of outdoor residual spraying on...
Autores principales: | , , , , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7595390/ https://www.ncbi.nlm.nih.gov/pubmed/33119645 http://dx.doi.org/10.1371/journal.pone.0240598 |
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author | Chaumeau, Victor Kajeechiwa, Ladda Kulabkeeree, Thithiworada Vishwakarma, Ramesh Kumar Wasisakun, Praphan Hsel, Saw Nay Oo, Kyi Dah, Tee Sawasdichai, Sunisa Trakoolchengkaew, Muesuwa Phanaphadungtham, Monthicha Inta, Aritsara Akararungrot, Yanada Lee, Naw Yu Kankew, Prasan Wiladphaingern, Jacher Mukaka, Mavuto Delmas, Gilles Nosten, François |
author_facet | Chaumeau, Victor Kajeechiwa, Ladda Kulabkeeree, Thithiworada Vishwakarma, Ramesh Kumar Wasisakun, Praphan Hsel, Saw Nay Oo, Kyi Dah, Tee Sawasdichai, Sunisa Trakoolchengkaew, Muesuwa Phanaphadungtham, Monthicha Inta, Aritsara Akararungrot, Yanada Lee, Naw Yu Kankew, Prasan Wiladphaingern, Jacher Mukaka, Mavuto Delmas, Gilles Nosten, François |
author_sort | Chaumeau, Victor |
collection | PubMed |
description | Outdoor and early mosquito biters challenge the efficacy of bed-nets and indoor residual spraying on the Thailand-Myanmar border. Outdoor residual spraying is proposed for the control of exophilic mosquito species. The objective of this study was to assess the impact of outdoor residual spraying on the biting rate of malaria vectors in Kayin state, Myanmar. Outdoor residual spraying using lambda-cyhalothrin was carried out in two villages in December 2016 (beginning of the dry season) and two villages were used as a control. Malaria mosquitoes were captured at baseline and monthly for four months after the intervention using human-landing catch and cow-baited trap collection methods. The impact of outdoor residual spraying on human-biting rate was estimated with propensity score adjusted generalized linear mixed-effect regressions. At baseline, mean indoor and outdoor human-biting rate estimates ranged between 2.12 and 29.16 bites /person /night, and between 0.20 and 1.72 bites /person /night in the intervention and control villages respectively. Using model output, we estimated that human-biting rate was reduced by 91% (95%CI = 88–96, P <0.0001) immediately after outdoor residual spraying. Human-biting rate remained low in all sprayed villages for 3 months after the intervention. Malaria vector populations rose at month 4 in the intervention villages but not in the controls. This coincided with the expected end of insecticide mist residual effects, thereby suggesting that residual effects are important determinants of intervention outcome. We conclude that outdoor residual spraying with a capsule suspension of lambda-cyhalothrin rapidly reduced the biting rate malaria vectors in this area where pyrethroid resistance has been documented. |
format | Online Article Text |
id | pubmed-7595390 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-75953902020-11-02 Impact of outdoor residual spraying on the biting rate of malaria vectors: A pilot study in four villages in Kayin state, Myanmar Chaumeau, Victor Kajeechiwa, Ladda Kulabkeeree, Thithiworada Vishwakarma, Ramesh Kumar Wasisakun, Praphan Hsel, Saw Nay Oo, Kyi Dah, Tee Sawasdichai, Sunisa Trakoolchengkaew, Muesuwa Phanaphadungtham, Monthicha Inta, Aritsara Akararungrot, Yanada Lee, Naw Yu Kankew, Prasan Wiladphaingern, Jacher Mukaka, Mavuto Delmas, Gilles Nosten, François PLoS One Research Article Outdoor and early mosquito biters challenge the efficacy of bed-nets and indoor residual spraying on the Thailand-Myanmar border. Outdoor residual spraying is proposed for the control of exophilic mosquito species. The objective of this study was to assess the impact of outdoor residual spraying on the biting rate of malaria vectors in Kayin state, Myanmar. Outdoor residual spraying using lambda-cyhalothrin was carried out in two villages in December 2016 (beginning of the dry season) and two villages were used as a control. Malaria mosquitoes were captured at baseline and monthly for four months after the intervention using human-landing catch and cow-baited trap collection methods. The impact of outdoor residual spraying on human-biting rate was estimated with propensity score adjusted generalized linear mixed-effect regressions. At baseline, mean indoor and outdoor human-biting rate estimates ranged between 2.12 and 29.16 bites /person /night, and between 0.20 and 1.72 bites /person /night in the intervention and control villages respectively. Using model output, we estimated that human-biting rate was reduced by 91% (95%CI = 88–96, P <0.0001) immediately after outdoor residual spraying. Human-biting rate remained low in all sprayed villages for 3 months after the intervention. Malaria vector populations rose at month 4 in the intervention villages but not in the controls. This coincided with the expected end of insecticide mist residual effects, thereby suggesting that residual effects are important determinants of intervention outcome. We conclude that outdoor residual spraying with a capsule suspension of lambda-cyhalothrin rapidly reduced the biting rate malaria vectors in this area where pyrethroid resistance has been documented. Public Library of Science 2020-10-29 /pmc/articles/PMC7595390/ /pubmed/33119645 http://dx.doi.org/10.1371/journal.pone.0240598 Text en © 2020 Chaumeau et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Chaumeau, Victor Kajeechiwa, Ladda Kulabkeeree, Thithiworada Vishwakarma, Ramesh Kumar Wasisakun, Praphan Hsel, Saw Nay Oo, Kyi Dah, Tee Sawasdichai, Sunisa Trakoolchengkaew, Muesuwa Phanaphadungtham, Monthicha Inta, Aritsara Akararungrot, Yanada Lee, Naw Yu Kankew, Prasan Wiladphaingern, Jacher Mukaka, Mavuto Delmas, Gilles Nosten, François Impact of outdoor residual spraying on the biting rate of malaria vectors: A pilot study in four villages in Kayin state, Myanmar |
title | Impact of outdoor residual spraying on the biting rate of malaria vectors: A pilot study in four villages in Kayin state, Myanmar |
title_full | Impact of outdoor residual spraying on the biting rate of malaria vectors: A pilot study in four villages in Kayin state, Myanmar |
title_fullStr | Impact of outdoor residual spraying on the biting rate of malaria vectors: A pilot study in four villages in Kayin state, Myanmar |
title_full_unstemmed | Impact of outdoor residual spraying on the biting rate of malaria vectors: A pilot study in four villages in Kayin state, Myanmar |
title_short | Impact of outdoor residual spraying on the biting rate of malaria vectors: A pilot study in four villages in Kayin state, Myanmar |
title_sort | impact of outdoor residual spraying on the biting rate of malaria vectors: a pilot study in four villages in kayin state, myanmar |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7595390/ https://www.ncbi.nlm.nih.gov/pubmed/33119645 http://dx.doi.org/10.1371/journal.pone.0240598 |
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