モトコ・リッチが書くべきだった話。 https://t.co/uyKte0ukBQ
— mozu (@mozumozumozu) July 6, 2020
それ以上に、日本では「3密」として早くから避けてきたようなところが、危ないんじゃないの？みたいなことを言ってるんですよ👶距離（2m）だけではダメなんじゃないか、という提起。日本人に言わせれば何を今更、と言う話込みなのね。
— 峰 宗太郎 (@minesoh) July 7, 2020
As somebody commented below JPN uses both forward and backward tracing. Backward tracing is to find cluster events. This COVID tracing started in late January in JPN. I am pleased to know that UK is now interested in the cluster defense. https://t.co/fCcIa2XZbK
— buvery (@buvery) July 6, 2020
Plus its serial interval is 1-2 days shorter than incubation period, ie u r infectious 1-2 days before onset already. This, 20/80, most are non/light symptom etc have been found by mid Feb by JP expert committee and its cluster analysis. That's why they implemented back tracing.
— zen_chip (@zen_chip) July 6, 2020
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