Divergent seasonal patterns of influenza types A and B across latitude gradient in Tropical Asia

Influenza and Other Respiratory Viruses
Siddhartha SahaGroup of Asian Researchers on Influenza (GARI)

Abstract

Influenza circulation in tropics and subtropics reveals a complex seasonal pattern with year-round circulation in some areas and biannual peaks in others. We analyzed influenza surveillance data from nine countries around southern and southeastern Asia spanning latitudinal gradient from equatorial to temperate zones to further characterize influenza type-specific seasonality in the region. We calculated proportion of positives by month out of positives during that year and adjust for variation in samples tested and positivity in these countries. Influenza A epidemics were identified between November and March during winters in areas lying above 30°N latitude, during monsoon months of June-November in areas between 10° and 30°N latitude, and no specific seasonality for influenza A virus circulation in areas lying closer to the equator. Influenza B circulation coincided with influenza A circulation in areas lying above 30°N latitude; however, in areas south of 30°N Asia, influenza B circulated year round at 3-8% of annual influenza B positives during most months with less pronounced peaks during post-monsoon period. Even though influenza B circulates round the year in most areas of the tropical regions of southern and southeaster...Continue Reading

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Citations

Apr 5, 2018·Human Vaccines & Immunotherapeutics·Rakesh KumarAnand Krishnan
Jan 20, 2018·Influenza and Other Respiratory Viruses·Armel M SanouChantal J Snoeck
May 2, 2018·PloS One·Wilson Chicaiza-AyalaMarco Coral-Almeida
Sep 30, 2020·PloS One·Nungruthai SuntronwongYong Poovorawan
Feb 6, 2020·Human Vaccines & Immunotherapeutics·Barnaby Edward Young, M Chen
Oct 27, 2017·Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America·Yat Hung TamBenjamin J Cowling
Dec 28, 2018·BMC Infectious Diseases·Alexandra AlmeidaPaula M Luz
Apr 29, 2020·WHO South-East Asia Journal of Public Health·UNKNOWN Members of the WHO South-East Asia Region Global Influenza Surveillance and Response System
Feb 6, 2020·Heliyon·Bimalesh Kumar JhaKrishna Das Manandhar
Feb 2, 2021·JMIR Public Health and Surveillance·Stefan David BaralSharmistha Mishra
May 21, 2021·Virologica Sinica·HoiMan NgXiaohua Douglas Zhang
May 20, 2017·The Lancet Infectious Diseases·Mark C SteinhoffJames M Tielsch

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