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An experimental hut study to quantify the effect of DDT and airborne pyrethroids on entomological parameters of malaria transmission
BACKGROUND: Current malaria vector control programmes rely on insecticides with rapid contact toxicity. However, spatial repellents can also be applied to reduce man-vector contact, which might ultimately impact malaria transmission. The aim of this study was to quantify effects of airborne pyrethro...
Autores principales: | , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4230423/ https://www.ncbi.nlm.nih.gov/pubmed/24693934 http://dx.doi.org/10.1186/1475-2875-13-131 |
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author | Ogoma, Sheila B Lorenz, Lena M Ngonyani, Hassan Sangusangu, Robert Kitumbukile, Mohammed Kilalangongono, Masoudi Simfukwe, Emmanuel T Mseka, Anton Mbeyela, Edgar Roman, Deogratius Moore, Jason Kreppel, Katharina Maia, Marta F Moore, Sarah J |
author_facet | Ogoma, Sheila B Lorenz, Lena M Ngonyani, Hassan Sangusangu, Robert Kitumbukile, Mohammed Kilalangongono, Masoudi Simfukwe, Emmanuel T Mseka, Anton Mbeyela, Edgar Roman, Deogratius Moore, Jason Kreppel, Katharina Maia, Marta F Moore, Sarah J |
author_sort | Ogoma, Sheila B |
collection | PubMed |
description | BACKGROUND: Current malaria vector control programmes rely on insecticides with rapid contact toxicity. However, spatial repellents can also be applied to reduce man-vector contact, which might ultimately impact malaria transmission. The aim of this study was to quantify effects of airborne pyrethroids from coils and DDT used an indoor residual spray (IRS) on entomological parameters that influence malaria transmission. METHODS: The effect of Transfluthrin and Metofluthrin coils compared to DDT on house entry, exit and indoor feeding behaviour of Anopheles gambiae sensu lato were measured in experimental huts in the field and in the semi-field. Outcomes were deterrence - reduction in house entry of mosquitoes; irritancy or excito-repellency – induced premature exit of mosquitoes; blood feeding inhibition and effect on mosquito fecundity. RESULTS: Transfluthrin coils, Metofluthrin coils and DDT reduced human vector contact through deterrence by 38%, 30% and 8%, respectively and induced half of the mosquitoes to leave huts before feeding (56%, 55% and 48%, respectively). Almost all mosquitoes inside huts with Metofluthrin and Transfluthrin coils and more than three quarters of mosquitoes in the DDT hut did not feed, almost none laid eggs and 67%, 72% and 70% of all mosquitoes collected from Transfluthrin, Metofluthrin and DDT huts, respectively had died after 24 hours. CONCLUSION: This study highlights that airborne pyrethroids and DDT affect a range of anopheline mosquito behaviours that are important parameters in malaria transmission, namely deterrence, irritancy/excito-repellency and blood-feeding inhibition. These effects are in addition to significant toxicity and reduced mosquito fecundity that affect mosquito densities and, therefore, provide community protection against diseases for both users and non-users. Airborne insecticides and freshly applied DDT had similar effects on deterrence, irritancy and feeding inhibition. Therefore, it is suggested that airborne pyrethroids, if delivered in suitable formats, may complement existing mainstream vector control tools. |
format | Online Article Text |
id | pubmed-4230423 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-42304232014-11-14 An experimental hut study to quantify the effect of DDT and airborne pyrethroids on entomological parameters of malaria transmission Ogoma, Sheila B Lorenz, Lena M Ngonyani, Hassan Sangusangu, Robert Kitumbukile, Mohammed Kilalangongono, Masoudi Simfukwe, Emmanuel T Mseka, Anton Mbeyela, Edgar Roman, Deogratius Moore, Jason Kreppel, Katharina Maia, Marta F Moore, Sarah J Malar J Research BACKGROUND: Current malaria vector control programmes rely on insecticides with rapid contact toxicity. However, spatial repellents can also be applied to reduce man-vector contact, which might ultimately impact malaria transmission. The aim of this study was to quantify effects of airborne pyrethroids from coils and DDT used an indoor residual spray (IRS) on entomological parameters that influence malaria transmission. METHODS: The effect of Transfluthrin and Metofluthrin coils compared to DDT on house entry, exit and indoor feeding behaviour of Anopheles gambiae sensu lato were measured in experimental huts in the field and in the semi-field. Outcomes were deterrence - reduction in house entry of mosquitoes; irritancy or excito-repellency – induced premature exit of mosquitoes; blood feeding inhibition and effect on mosquito fecundity. RESULTS: Transfluthrin coils, Metofluthrin coils and DDT reduced human vector contact through deterrence by 38%, 30% and 8%, respectively and induced half of the mosquitoes to leave huts before feeding (56%, 55% and 48%, respectively). Almost all mosquitoes inside huts with Metofluthrin and Transfluthrin coils and more than three quarters of mosquitoes in the DDT hut did not feed, almost none laid eggs and 67%, 72% and 70% of all mosquitoes collected from Transfluthrin, Metofluthrin and DDT huts, respectively had died after 24 hours. CONCLUSION: This study highlights that airborne pyrethroids and DDT affect a range of anopheline mosquito behaviours that are important parameters in malaria transmission, namely deterrence, irritancy/excito-repellency and blood-feeding inhibition. These effects are in addition to significant toxicity and reduced mosquito fecundity that affect mosquito densities and, therefore, provide community protection against diseases for both users and non-users. Airborne insecticides and freshly applied DDT had similar effects on deterrence, irritancy and feeding inhibition. Therefore, it is suggested that airborne pyrethroids, if delivered in suitable formats, may complement existing mainstream vector control tools. BioMed Central 2014-04-01 /pmc/articles/PMC4230423/ /pubmed/24693934 http://dx.doi.org/10.1186/1475-2875-13-131 Text en Copyright © 2014 Ogoma et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Research Ogoma, Sheila B Lorenz, Lena M Ngonyani, Hassan Sangusangu, Robert Kitumbukile, Mohammed Kilalangongono, Masoudi Simfukwe, Emmanuel T Mseka, Anton Mbeyela, Edgar Roman, Deogratius Moore, Jason Kreppel, Katharina Maia, Marta F Moore, Sarah J An experimental hut study to quantify the effect of DDT and airborne pyrethroids on entomological parameters of malaria transmission |
title | An experimental hut study to quantify the effect of DDT and airborne pyrethroids on entomological parameters of malaria transmission |
title_full | An experimental hut study to quantify the effect of DDT and airborne pyrethroids on entomological parameters of malaria transmission |
title_fullStr | An experimental hut study to quantify the effect of DDT and airborne pyrethroids on entomological parameters of malaria transmission |
title_full_unstemmed | An experimental hut study to quantify the effect of DDT and airborne pyrethroids on entomological parameters of malaria transmission |
title_short | An experimental hut study to quantify the effect of DDT and airborne pyrethroids on entomological parameters of malaria transmission |
title_sort | experimental hut study to quantify the effect of ddt and airborne pyrethroids on entomological parameters of malaria transmission |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4230423/ https://www.ncbi.nlm.nih.gov/pubmed/24693934 http://dx.doi.org/10.1186/1475-2875-13-131 |
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