URL: http://tsigeto.info/covid19/covid19japan20200226.txt Title: Distribution of the number of secondary transmission from COVID-19 cases in Japan (as of 2020-02-26) by environmental condition 0 1 2 3 4 9 12 B 4 4 2 2 1 1 1 V 2 3 1 1 0 0 0 O 77 9 1 1 0 0 0 [Explanation] B: 閉鎖的で換気が悪い環境 (Closed with bad ventilation) V: 閉鎖的だが換気が悪い環境ではない (Closed but ventilated) O: 閉鎖的でない (Not closed) [Source] Ministry of Health, Labour and Welfare (MHLW) 新型コロナウイルスに関するQ&A (一般の方向け)http://web.archive.org/web/20200229174116/https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/dengue_fever_qa_00001.html#Q12 (Q12 "集団感染を防ぐためにはどうすればよいでしょうか?" Figure "一人の感染者が生み出した2次感染者数"). Hiroshi Nishiura, Hitoshi Oshitani, Tetsuro Kobayashi, Tomoya Saito, Tomimasa Sunagawa, Tamano Matsui, Takaji Wakita, MHLW COVID-19 Response Team, Motoi Suzuki. "Closed environments facilitate secondary transmission of coronavirus disease 2019 (COVID-19)" medRxiv. doi:10.1101/2020.02.28.20029272 (Posted March 03, 2020) https://www.medrxiv.org/content/10.1101/2020.02.28.20029272v1.full.pdf (Figure). [history] 2020-04-25: Published on http://tsigeto.info/covid19/covid19japan20200226.txt [Creator and related information] TANAKA Sigeto. See http://tsigeto.info [Format] Tab-separated text. Japanese explanation in UTF-8 encoding.