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World Health Organization\uff1aWHO, Statement on the fifteenth meeting of the IHR (2005) Emergency Committee on the COVID-19 pandemic. Available at <https:\/\/www.who.int\/news\/item\/05-05-2023-statement-on-the-fifteenth-meeting-of-the-international-health-regulations-(2005)-emergency-committee-regarding-the-coronavirus-disease-(covid-19)-pandemic>. Accessed August 25, 2025."},{"key":"2","unstructured":"2. Japan Institute for Health Security, Infectious Diseases Weekly Report Japan. Available at <https:\/\/id-info.jihs.go.jp\/surveillance\/idwr\/index.html>. Accessed August 25, 2025."},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Kanamori R, Yan Y, Ito K, et al. Increased SARS-CoV-2 seroprevalence and spread of infection without awareness among healthcare workers through 2020-2022 in a Japanese medical center. Sci Rep. 2023;13(1):4941.","DOI":"10.1038\/s41598-023-32193-4"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. 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Anti-nucleocapsid antibody levels following initial and repeat SARS-CoV-2 infections in a cohort of long-term care facility residents in England (VIVALDI). Wellcome Open Res. 2024; 9:45.","DOI":"10.12688\/wellcomeopenres.20750.1"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Yamayoshi S, Yasuhara A, Ito M, et al. Antibody titers against SARS-CoV-2 decline, but do not disappear for several months. 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