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. 2022 Jul 7;27:30. doi: 10.1265/ehpm.22-00016

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — Anti-SARS-Cov-2 antibody seroconversion rate in Hiroshima Prefecture from August 2020 to February 2021

This figure shows the flow of the follow-up subjects on the study of anti-SARS-Cov-2 antibody seroconversion rate. From a total of 3,452 subjects who participated at least once in the three rounds of the study, 2,552 subjects were included in the analysis of anti-SARS-Cov-2 antibody seroconversion rate. Four subjects acquired anti-SARS-Cov-2 antibodies during the follow-up, indicating a seroconversion rate of 395.2 persons per 100,000 person-years.