https://edition.cnn.com/2022/04/05/health/israel-fourth-dose-study/index.htmlhttps://covid.cdc.gov/covid-data-tracker/#trends_weeklycases_select_00https://www3.nhk.or.jp/news/special/coronavirus/data-all/https://www3.nhk.or.jp/news/special/coronavirus/vaccine/world_progress/
http://www.nicovideo.jp/watch/sm42189509
