Cargando…
Impact of recent climate extremes on mosquito-borne disease transmission in Kenya
Climate change and variability influence temperature and rainfall, which impact vector abundance and the dynamics of vector-borne disease transmission. Climate change is projected to increase the frequency and intensity of extreme climate events. Mosquito-borne diseases, such as dengue fever, are pr...
Autores principales: | , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2021
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7971569/ https://www.ncbi.nlm.nih.gov/pubmed/33735293 http://dx.doi.org/10.1371/journal.pntd.0009182 |
_version_ | 1783666640856023040 |
---|---|
author | Nosrat, Cameron Altamirano, Jonathan Anyamba, Assaf Caldwell, Jamie M. Damoah, Richard Mutuku, Francis Ndenga, Bryson LaBeaud, A. Desiree |
author_facet | Nosrat, Cameron Altamirano, Jonathan Anyamba, Assaf Caldwell, Jamie M. Damoah, Richard Mutuku, Francis Ndenga, Bryson LaBeaud, A. Desiree |
author_sort | Nosrat, Cameron |
collection | PubMed |
description | Climate change and variability influence temperature and rainfall, which impact vector abundance and the dynamics of vector-borne disease transmission. Climate change is projected to increase the frequency and intensity of extreme climate events. Mosquito-borne diseases, such as dengue fever, are primarily transmitted by Aedes aegypti mosquitoes. Freshwater availability and temperature affect dengue vector populations via a variety of biological processes and thus influence the ability of mosquitoes to effectively transmit disease. However, the effect of droughts, floods, heat waves, and cold waves is not well understood. Using vector, climate, and dengue disease data collected between 2013 and 2019 in Kenya, this retrospective cohort study aims to elucidate the impact of extreme rainfall and temperature on mosquito abundance and the risk of arboviral infections. To define extreme periods of rainfall and land surface temperature (LST), we calculated monthly anomalies as deviations from long-term means (1983–2019 for rainfall, 2000–2019 for LST) across four study locations in Kenya. We classified extreme climate events as the upper and lower 10% of these calculated LST or rainfall deviations. Monthly Ae. aegypti abundance was recorded in Kenya using four trapping methods. Blood samples were also collected from children with febrile illness presenting to four field sites and tested for dengue virus using an IgG enzyme-linked immunosorbent assay (ELISA) and polymerase chain reaction (PCR). We found that mosquito eggs and adults were significantly more abundant one month following an abnormally wet month. The relationship between mosquito abundance and dengue risk follows a non-linear association. Our findings suggest that early warnings and targeted interventions during periods of abnormal rainfall and temperature, especially flooding, can potentially contribute to reductions in risk of viral transmission. |
format | Online Article Text |
id | pubmed-7971569 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-79715692021-03-31 Impact of recent climate extremes on mosquito-borne disease transmission in Kenya Nosrat, Cameron Altamirano, Jonathan Anyamba, Assaf Caldwell, Jamie M. Damoah, Richard Mutuku, Francis Ndenga, Bryson LaBeaud, A. Desiree PLoS Negl Trop Dis Research Article Climate change and variability influence temperature and rainfall, which impact vector abundance and the dynamics of vector-borne disease transmission. Climate change is projected to increase the frequency and intensity of extreme climate events. Mosquito-borne diseases, such as dengue fever, are primarily transmitted by Aedes aegypti mosquitoes. Freshwater availability and temperature affect dengue vector populations via a variety of biological processes and thus influence the ability of mosquitoes to effectively transmit disease. However, the effect of droughts, floods, heat waves, and cold waves is not well understood. Using vector, climate, and dengue disease data collected between 2013 and 2019 in Kenya, this retrospective cohort study aims to elucidate the impact of extreme rainfall and temperature on mosquito abundance and the risk of arboviral infections. To define extreme periods of rainfall and land surface temperature (LST), we calculated monthly anomalies as deviations from long-term means (1983–2019 for rainfall, 2000–2019 for LST) across four study locations in Kenya. We classified extreme climate events as the upper and lower 10% of these calculated LST or rainfall deviations. Monthly Ae. aegypti abundance was recorded in Kenya using four trapping methods. Blood samples were also collected from children with febrile illness presenting to four field sites and tested for dengue virus using an IgG enzyme-linked immunosorbent assay (ELISA) and polymerase chain reaction (PCR). We found that mosquito eggs and adults were significantly more abundant one month following an abnormally wet month. The relationship between mosquito abundance and dengue risk follows a non-linear association. Our findings suggest that early warnings and targeted interventions during periods of abnormal rainfall and temperature, especially flooding, can potentially contribute to reductions in risk of viral transmission. Public Library of Science 2021-03-18 /pmc/articles/PMC7971569/ /pubmed/33735293 http://dx.doi.org/10.1371/journal.pntd.0009182 Text en © 2021 Nosrat 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 Nosrat, Cameron Altamirano, Jonathan Anyamba, Assaf Caldwell, Jamie M. Damoah, Richard Mutuku, Francis Ndenga, Bryson LaBeaud, A. Desiree Impact of recent climate extremes on mosquito-borne disease transmission in Kenya |
title | Impact of recent climate extremes on mosquito-borne disease transmission in Kenya |
title_full | Impact of recent climate extremes on mosquito-borne disease transmission in Kenya |
title_fullStr | Impact of recent climate extremes on mosquito-borne disease transmission in Kenya |
title_full_unstemmed | Impact of recent climate extremes on mosquito-borne disease transmission in Kenya |
title_short | Impact of recent climate extremes on mosquito-borne disease transmission in Kenya |
title_sort | impact of recent climate extremes on mosquito-borne disease transmission in kenya |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7971569/ https://www.ncbi.nlm.nih.gov/pubmed/33735293 http://dx.doi.org/10.1371/journal.pntd.0009182 |
work_keys_str_mv | AT nosratcameron impactofrecentclimateextremesonmosquitobornediseasetransmissioninkenya AT altamiranojonathan impactofrecentclimateextremesonmosquitobornediseasetransmissioninkenya AT anyambaassaf impactofrecentclimateextremesonmosquitobornediseasetransmissioninkenya AT caldwelljamiem impactofrecentclimateextremesonmosquitobornediseasetransmissioninkenya AT damoahrichard impactofrecentclimateextremesonmosquitobornediseasetransmissioninkenya AT mutukufrancis impactofrecentclimateextremesonmosquitobornediseasetransmissioninkenya AT ndengabryson impactofrecentclimateextremesonmosquitobornediseasetransmissioninkenya AT labeaudadesiree impactofrecentclimateextremesonmosquitobornediseasetransmissioninkenya |