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Volume 29, Number 4—April 2023
Dispatch

Effects of Seasonal Conditions on Abundance of Malaria Vector Anopheles stephensi Mosquitoes, Djibouti, 2018–2021

Alia ZayedComments to Author , Manal Moustafa, Reham Tageldin, and James F. Harwood
Author affiliations: US Naval Medical Research Unit No. 3, Cairo Detachment, Cairo, Egypt (A. Zayed, M. Moustafa, R. Tageldin); US Naval Medical Research Unit No. 3, Sigonella, Italy (J. Harwood); Cairo University, Cairo, Egypt (A. Zayed)

Main Article

Table 1

Univariate Poisson regression analysis of lagged effects of rainfall on abundance of Anopheles stephensi mosquitoes 2 weeks, 1 month, and 2 months after rainfall periods, US military base, Djibouti, September 2019–August 2020*

Time after rainfall Rainfall level, mm/wk Regression analysis
 Abundance
IRR (95% CI) p value
2 wk
 40–155 0.56 (0.3–1.1) 0.09 2.3
21.1–39.9 2.4 (1.7–3.4) <0.0001 9.6
5–21 1.5 (0.9–2.5) 0.11 6
0.2–4.9 2.59 (2–3.4) <0.0001 10.4
0
 Referent
4
1 mo
 40–155 1.86 (0.9–2.2) 0.009 7
21.1– 39.9 2.99 (2–3.8) <0.0001 11.3
5–21 1.13 (0.9–2.4) 0.6 4.3
0.2–4.9 2.58 (1.5–2.7) <0.0001 9.8
0
 Referent
3.8
2 mo 40–155 1.37 (1.2–3) 0.17 5.5
21.1–39.9 2.75 (2.1–4.2) <0.0001 11
5–21 1.42 (0.7–1.9) 0.18 5.7
0.2–4.9 2 (1.9–3.5) <0.0001 8
0 Referent 4

*Abundance is the average number of mosquitoes per trap night. IRR, incidence rate ratio.

Main Article

Page created: February 15, 2023
Page updated: March 21, 2023
Page reviewed: March 21, 2023
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