1. National Institute of Infetious diseases Ministry of Health Labour and Welfare Tuberculosis and Infectious Diseases Control Division.[Influenza virus in the winter of 2019/20] [Website in Japanese].2021;https://www.niid.go.jp/niid/ja/flu-m/590-idsc/9830-fludoko-2020.html. Accessed February 7 2022.
2. National Institute of Infectious Disease.[What is Influenza virus?] [Website in Japanese].2021;https://www.niid.go.jp/niid/ja/diseases/a/flu.html. Accessed February 7 2022.
3. Centers for Disease Control and Prevention.About flu.2021;https://www.cdc.gov/flu/about/index.html. Accessed February 7 2022.
4. World Health Organization.WHO public health research agenda for influenza: optimizing treatment of patients 2017 update.2021;https://apps.who.int/iris/bitstream/handle/10665/259887/WHO-IHM-GIP-2017.7-eng.pdf?sequence=1. Accessed February 7 2022.
5. The Japanese Association for Infectious Disease.[Proposal from the Japanese Association for Infectious Diseases “About the use of anti‐influenza drugs“] [Website in Japanese].2021;https://www.kansensho.or.jp/modules/guidelines/index.php?content_id=37. Accessed February 7 2022.