Figure 1. Number of reported COVID-19 cases in Japan. Drawing from the “Ministry of Health, Labour and Welfare (from January 16, 2020, to May 8, 2023) Visualizing the data: information on COVID-19 infections” (https://www.mhlw.go.jp/stf/covid-19/open-data.html). (1) The first COVID-19 patient was reported on January 16, 2020. (2) Changed to sentinel reporting for infectious disease surveillance on May 7, 2023.
Figure 2. Number of COVID-19 patients reported in Osaka Prefecture, Japan (first surge: Jan 29-Jun 13, 2020; second surge: Jun 14-Oct 9, 2020; third surge: Oct 10, 2020-Feb 28, 2021), and the observational period of this study (Jan 29-Dec 24, 2020). Drawing from the “Ministry of Health, Labour and Welfare Visualizing the data: information on COVID-19 infections” (https://www.mhlw.go.jp/stf/covid-19/open-data.html).
