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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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Proportions of events in putative cases of with variant alpha and preexisting strain COVID-19 by age group. (A) Severe cases and (B) deaths are shown. Error bars represent 95% confidence intervals.