Microclimate variables of the ambient environment deliver the actual estimates of the extrinsic incubation period of Plasmodium vivax and Plasmodium falciparum: a study from a malaria-endemic urban setting, Chennai in India
Abstract Background Environmental factors such as temperature, relative humidity and their daily variation influence a range of mosquito life history traits and hence, malaria transmission. The standard way of characterizing environmental factors with meteorological station data need not be the actu...
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ftdoajarticles:oai:doaj.org/article:4546c18ab989439287d637e2dce299f9 2023-05-15T15:17:43+02:00 Microclimate variables of the ambient environment deliver the actual estimates of the extrinsic incubation period of Plasmodium vivax and Plasmodium falciparum: a study from a malaria-endemic urban setting, Chennai in India Shalu Thomas Sangamithra Ravishankaran N. A. Johnson Amala Justin Aswin Asokan T. Maria Jusler Kalsingh Manu Thomas Mathai Neena Valecha Jacqui Montgomery Matthew B. Thomas Alex Eapen 2018-05-01T00:00:00Z https://doi.org/10.1186/s12936-018-2342-1 https://doaj.org/article/4546c18ab989439287d637e2dce299f9 EN eng BMC http://link.springer.com/article/10.1186/s12936-018-2342-1 https://doaj.org/toc/1475-2875 doi:10.1186/s12936-018-2342-1 1475-2875 https://doaj.org/article/4546c18ab989439287d637e2dce299f9 Malaria Journal, Vol 17, Iss 1, Pp 1-17 (2018) Extrinsic incubation period Microclimate Relative humidity Daily temperature range Anopheles stephensi Man hour density Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 article 2018 ftdoajarticles https://doi.org/10.1186/s12936-018-2342-1 2022-12-31T14:53:00Z Abstract Background Environmental factors such as temperature, relative humidity and their daily variation influence a range of mosquito life history traits and hence, malaria transmission. The standard way of characterizing environmental factors with meteorological station data need not be the actual microclimates experienced by mosquitoes within local transmission settings. Methods A year-long study was conducted in Chennai, India to characterize local temperature and relative humidity (RH). Data loggers (Hobos) were placed in a range of probable indoor and outdoor resting sites of Anopheles stephensi. Recordings were taken hourly to estimate mean temperature and RH, together with daily temperature range (DTR) and daily relative humidity range. The temperature data were used to explore the predicted variation in extrinsic incubation period (EIP) of Plasmodium falciparum and Plasmodium vivax between microhabitats and across the year. Results Mean daily temperatures within the indoor settings were significantly warmer than those recorded outdoors. DTR in indoor environments was observed to be modest and ranged from 2 to 6 °C. Differences in EIP between microhabitats were most notable during the hottest summer months of April–June, with parasite development predicted to be impaired for tiled houses and overhead tanks. Overall, the prevailing warm and stable conditions suggest rapid parasite development rate regardless of where mosquitoes might rest. Taking account of seasonal and local environmental variation, the predicted EIP of P. falciparum varied from a minimum of 9.1 days to a maximum of 15.3 days, while the EIP of P. vivax varied from 8.0 to 24.3 days. Conclusions This study provides a detailed picture of the actual microclimates experienced by mosquitoes in an urban slum malaria setting. The data indicate differences between microhabitats that could impact mosquito and parasite life history traits. The predicted effects for EIP are often relatively subtle, but variation between minimum and maximum EIPs ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Malaria Journal 17 1 |
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Extrinsic incubation period Microclimate Relative humidity Daily temperature range Anopheles stephensi Man hour density Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 |
spellingShingle |
Extrinsic incubation period Microclimate Relative humidity Daily temperature range Anopheles stephensi Man hour density Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 Shalu Thomas Sangamithra Ravishankaran N. A. Johnson Amala Justin Aswin Asokan T. Maria Jusler Kalsingh Manu Thomas Mathai Neena Valecha Jacqui Montgomery Matthew B. Thomas Alex Eapen Microclimate variables of the ambient environment deliver the actual estimates of the extrinsic incubation period of Plasmodium vivax and Plasmodium falciparum: a study from a malaria-endemic urban setting, Chennai in India |
topic_facet |
Extrinsic incubation period Microclimate Relative humidity Daily temperature range Anopheles stephensi Man hour density Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 |
description |
Abstract Background Environmental factors such as temperature, relative humidity and their daily variation influence a range of mosquito life history traits and hence, malaria transmission. The standard way of characterizing environmental factors with meteorological station data need not be the actual microclimates experienced by mosquitoes within local transmission settings. Methods A year-long study was conducted in Chennai, India to characterize local temperature and relative humidity (RH). Data loggers (Hobos) were placed in a range of probable indoor and outdoor resting sites of Anopheles stephensi. Recordings were taken hourly to estimate mean temperature and RH, together with daily temperature range (DTR) and daily relative humidity range. The temperature data were used to explore the predicted variation in extrinsic incubation period (EIP) of Plasmodium falciparum and Plasmodium vivax between microhabitats and across the year. Results Mean daily temperatures within the indoor settings were significantly warmer than those recorded outdoors. DTR in indoor environments was observed to be modest and ranged from 2 to 6 °C. Differences in EIP between microhabitats were most notable during the hottest summer months of April–June, with parasite development predicted to be impaired for tiled houses and overhead tanks. Overall, the prevailing warm and stable conditions suggest rapid parasite development rate regardless of where mosquitoes might rest. Taking account of seasonal and local environmental variation, the predicted EIP of P. falciparum varied from a minimum of 9.1 days to a maximum of 15.3 days, while the EIP of P. vivax varied from 8.0 to 24.3 days. Conclusions This study provides a detailed picture of the actual microclimates experienced by mosquitoes in an urban slum malaria setting. The data indicate differences between microhabitats that could impact mosquito and parasite life history traits. The predicted effects for EIP are often relatively subtle, but variation between minimum and maximum EIPs ... |
format |
Article in Journal/Newspaper |
author |
Shalu Thomas Sangamithra Ravishankaran N. A. Johnson Amala Justin Aswin Asokan T. Maria Jusler Kalsingh Manu Thomas Mathai Neena Valecha Jacqui Montgomery Matthew B. Thomas Alex Eapen |
author_facet |
Shalu Thomas Sangamithra Ravishankaran N. A. Johnson Amala Justin Aswin Asokan T. Maria Jusler Kalsingh Manu Thomas Mathai Neena Valecha Jacqui Montgomery Matthew B. Thomas Alex Eapen |
author_sort |
Shalu Thomas |
title |
Microclimate variables of the ambient environment deliver the actual estimates of the extrinsic incubation period of Plasmodium vivax and Plasmodium falciparum: a study from a malaria-endemic urban setting, Chennai in India |
title_short |
Microclimate variables of the ambient environment deliver the actual estimates of the extrinsic incubation period of Plasmodium vivax and Plasmodium falciparum: a study from a malaria-endemic urban setting, Chennai in India |
title_full |
Microclimate variables of the ambient environment deliver the actual estimates of the extrinsic incubation period of Plasmodium vivax and Plasmodium falciparum: a study from a malaria-endemic urban setting, Chennai in India |
title_fullStr |
Microclimate variables of the ambient environment deliver the actual estimates of the extrinsic incubation period of Plasmodium vivax and Plasmodium falciparum: a study from a malaria-endemic urban setting, Chennai in India |
title_full_unstemmed |
Microclimate variables of the ambient environment deliver the actual estimates of the extrinsic incubation period of Plasmodium vivax and Plasmodium falciparum: a study from a malaria-endemic urban setting, Chennai in India |
title_sort |
microclimate variables of the ambient environment deliver the actual estimates of the extrinsic incubation period of plasmodium vivax and plasmodium falciparum: a study from a malaria-endemic urban setting, chennai in india |
publisher |
BMC |
publishDate |
2018 |
url |
https://doi.org/10.1186/s12936-018-2342-1 https://doaj.org/article/4546c18ab989439287d637e2dce299f9 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Malaria Journal, Vol 17, Iss 1, Pp 1-17 (2018) |
op_relation |
http://link.springer.com/article/10.1186/s12936-018-2342-1 https://doaj.org/toc/1475-2875 doi:10.1186/s12936-018-2342-1 1475-2875 https://doaj.org/article/4546c18ab989439287d637e2dce299f9 |
op_doi |
https://doi.org/10.1186/s12936-018-2342-1 |
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Malaria Journal |
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17 |
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1 |
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1766347960341233664 |