Published: 1 July 2021
Author(s): Keigo Kobayashi, Masayuki Noguchi
Section: Letter to the Editor

Until recently, wearing masks, a long-term custom in Japan during the winter flu season and during early springtime to protect against Japanese cedar pollinosis was not common in everyday life in other countries. Here, we provide our experience through the flu season of 2020/2021 in Japan, which underscores the importance of wearing masks to prevent coinfection of influenza and COVID-19.

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