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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
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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