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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 2

Multivariate Poisson regression analysis of seasonal and climatic factors associated with Anopheles stephensi mosquito abundance with and without lag effect after rainfall periods, US military base, Djibouti, September 2019–August 2020*

Variable No lag effect
1-mo lag effect
IRR (95% CI) p value IRR (95% CI) p value
Seasons
Winter 4.2 (2.7–6.3) <0.0001 4.12 (2.7–6.2) <0.0001
Spring 2.8 (1.9–4.2) <0.0001 2.86 (1.9–4.2) <0.0001
Fall 1.3 (0.8–1.9) 0.3 1.19 (0.8–1.8) 0.42
Summer
Referent


Referent

Temperature, °C
<30 2.4 (1.9–3.1) <0.0001 2.2 (1.7–2.9) <0.0001
>30
Referent


Referent
NA
Rain amounts, mm/wk
40–155 0.33 (0.2–0.7) 0.004 1.2 (0.8–1.8) 0.4
21.1–39.9 1.1 (0.8–1.5) 0.6 1.5 (1.2–2.1) 0.0024
5–21 0.9 (0.6–1.3) 0.53 0.9 (0.6–1.5) 0.7
0.2–4.9 0.7 (0.6–0.9) 0.005 1.4 (1.2–1.7) 0.0002
0
Referent


Referent

*NA, not applicable; 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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