Article Category:
Short Report

Night Time Extension of Aedes aegypti Human Blood Seeking Activity

Bryson Alberto Ndenga Centre for Global Health Research, Kenya Medical Research Institute, Kisumu, Kenya;

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Francis Maluki Mutuku Department of Environment and Health Sciences, Technical University of Mombasa, Mombasa, Kenya;

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Harun Njenga Ngugi Department of Biological Sciences, Chuka University, Chuka, Kenya;

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Joel Omari Mbakaya Centre for Global Health Research, Kenya Medical Research Institute, Kisumu, Kenya;

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Dunstan Mukoko Vector Borne Disease Control Unit, Ministry of Health, Nairobi, Kenya;

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Uriel Kitron Department of Environmental Sciences, Emory University, Atlanta, Georgia;

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Angelle Desiree LaBeaud Department of Pediatrics, Stanford University, Stanford, California

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DOI:
https://doi.org/10.4269/ajtmh.21-0309
Volume/Issue:
Volume 107: Issue 1
Page(s):
208–210
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ABSTRACT.

This study examined whether Aedes aegypti extends its human blood seeking activity into night hours. Human landing catches (HLC) were conducted hourly from early morning (04:30) to late evening (21:30) in urban and rural sites in Kisumu County in western Kenya, and in Kwale County at the coast. Out of 842 female Ae. aegypti mosquitoes, 71 (8.5%) were collected at night (nocturnal), 151 (17.9%) at twilight (crepuscular), and 620 (73.6%) during the day (diurnal). Three-fold and significantly more Ae. aegypti female mosquitoes were collected during the twilight (crepuscular) hours than night (nocturnal) hours. Significantly more Ae. aegypti female mosquitoes were collected during daytime (diurnal) than night time (nocturnal). In general, the number of mosquitoes collected reduced as darkness increased. Extended time into the night to seek for blood meals enhances chances for Ae. aegypti to contact humans and transmit arboviruses diseases.

Author Notes

Address correspondence to Bryson Alberto Ndenga, Centre for Global Health Research, Kenya Medical Research Institute, Kisumu, Kenya. E-mail: bndenga@yahoo.com

Financial support: This study was funded by a program award RO1 AI102918 from the National Institutes of Health, to A. D. L.

Authors’ addresses: Bryson Alberto Ndenga and Joel Omari Mbakaya, Centre for Global Health Research, Kenya Medical Research Institute, Kisumu, Kenya, E-mails: bndenga@yahoo.com and ojoel58@yahoo.com. Francis Maluki Mutuku, Department of Environment and Health Sciences, Technical University of Mombasa, Mombasa, Kenya, E-mail: fmutuku73@gmail.com. Harun Njenga Ngugi, Department of Biological Sciences, Chuka University, Chuka, Kenya, E-mail: ngugihn09@gmail.com. Dunstan Mukoko, Vector Borne Disease Control Unit, Nairobi, Kenya, E-mail: dunstan.mukoko29@gmail.com. Uriel Kitron, Department of Environmental Sciences, Emory University, Atlanta, GA, E-mail: ukitron@emory.edu. Angelle Desiree LaBeaud, Department of Pediatrics, Stanford University, Stanford, CA, E-mail: dlabeaud@stanford.edu.

Copyright:
© The American Society of Tropical Medicine and Hygiene 2022
Received:
15 Mar 2021
|
Accepted:
24 Jan 2022
|
Published Online:
31 May 2022
Cover The American Journal of Tropical Medicine and Hygiene
The American Journal of Tropical Medicine and Hygiene
Print ISSN:
0002-9637
Online ISSN:
1476-1645
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