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Title :An Epidemiological Analysis of Summer Influenza Epidemics in Okinawa
Authors :Sunagawa, Satoko
Iha, Yoshikazu
Taira, Katsuya
Okano, Sho
Kinjo, Takeshi
Higa, Futoshi
Kuba, Kazufumi
Tateyama, Masao
Nakamura, Katsunori
Nakamura, Shota
Motooka, Daisuke
Horii, Toshihiro
Parrott, Gretchen L.
Fujita, Jiro
Issue Date :15-Dec-2016
Abstract :Objective This study evaluates the difference between winter influenza and summer influenza in Okinawa. Methods From January 2007 to June 2014, weekly rapid antigen test (RAT) results performed in four acute care hospitals were collected for the surveillance of regional influenza prevalence in the Naha region of the Okinawa Islands. Results An antigenic data analysis revealed that multiple H1N1 and H3N2 viruses consistently co-circulate in Okinawa, creating synchronized seasonal patterns and a high genetic diversity of influenza A. Additionally, influenza B viruses play a significant role in summer epidemics, almost every year. To further understand influenza epidemics during the summer in Okinawa, we evaluated the full genome sequences of some representative human influenza A and influenza B viruses isolated in Okinawa. Phylogenetic data analysis also revealed that multiple H1N1 and H3N2 viruses consistently co-circulate in Okinawa. Conclusion This surveillance revealed a distinct epidemic pattern of seasonal and pandemic influenza in this subtropical region.
URL :https://doi.org/10.2169/internalmedicine.55.7107
Type Local :雑誌掲載論文
ISSN :1349-7235
Publisher :The Japanese Society of Internal Medicine
URI :http://hdl.handle.net/20.500.12000/46445
Citation :Internal Medicine Vol.55 no.24 p.3579 -3584
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Medicine)

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