Shifting Patterns of Influenza Circulation during the COVID-19 Pandemic, Senegal

Historically low levels of seasonal influenza circulation were reported during the first years of the COVID-19 pandemic and were mainly attributed to implementation of nonpharmaceutical interventions. In tropical regions, influenza’s seasonality differs largely, and data on this topic are scarce. We...

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Vydáno v:Emerging infectious diseases Ročník 29; číslo 9; s. 1808 - 1817
Hlavní autoři: Lampros, Alexandre, Talla, Cheikh, Diarra, Maryam, Tall, Billo, Sagne, Samba, Diallo, Mamadou Korka, Diop, Boly, Oumar, Ibrahim, Dia, Ndongo, Sall, Amadou Alpha, Barry, Mamadou Aliou, Loucoubar, Cheikh
Médium: Journal Article
Jazyk:angličtina
Vydáno: Atlanta U.S. National Center for Infectious Diseases 01.09.2023
Centers for Disease Control and Prevention
Témata:
Analysis
Control
COVID-19
Epidemics
Health aspects
Health surveillance
Influenza
Pandemics
Patients
Prevention
Public health
Rainy season
respiratory infections
Risk factors
SARS-CoV-2
Seasonal variations
Seasonal variations (Diseases)
Senegal
Severe acute respiratory syndrome coronavirus 2
Shifting Patterns of Influenza Circulation during the COVID-19 Pandemic, Senegal
Tropical environments
Viruses
Senegal
West Africa
ISSN:1080-6040, 1080-6059, 1080-6059
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Shrnutí:Historically low levels of seasonal influenza circulation were reported during the first years of the COVID-19 pandemic and were mainly attributed to implementation of nonpharmaceutical interventions. In tropical regions, influenza’s seasonality differs largely, and data on this topic are scarce. We analyzed data from Senegal’s sentinel syndromic surveillance network before and after the start of the COVID-19 pandemic to assess changes in influenza circulation. We found that influenza shows year-round circulation in Senegal and has 2 distinct epidemic peaks: during January–March and during the rainy season in August–October. During 2021–2022, the expected January–March influenza peak completely disappeared, corresponding to periods of active SARS-CoV-2 circulation. We noted an unexpected influenza epidemic peak during May–July 2022. The observed reciprocal circulation of SARS-CoV-2 and influenza suggests that factors such as viral interference might be at play and should be further investigated in tropical settings.
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A.L. designed the study, extracted and analyzed the data, and wrote the original draft. M.A.B. participated in the study design, data extraction and analysis, and revised the original draft. S.S. contributed to data curation and management and participated in data extraction. C.L. participated in the study design and supervised and contributed to the review and editing of the paper. M.A.B., C.T., M.D., B.T., M.K.D., C.L., B.D., N.D., Y.S., I.O.B., and A.A.S. all contributed to the management of the surveillance system and edited the paper.
ISSN:1080-6040
1080-6059
1080-6059
DOI:10.3201/eid2909.230307