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. 2022 Jun 10;10:837970. doi: 10.3389/fpubh.2022.837970

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Copyright © 2022 Kayano, Hayashi, Kobayashi and Nishiura.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Age distribution of epidemiological characteristics of COVID-19 in Osaka. (A) Population dynamics in Osaka in 2019. (B) Absolute number of cases, (C) severe cases and (D) deaths due to preexisting and variant alpha strains of COVID-19 in Osaka.