Over the 4 days of infection before the typical time of symptom onset the probability of a false-negative result in an infected person decreases from 100% on day 1 to 67% on day 4

#新型コロナ のPCR検査の偽陰性率:

感染当日100%
感染から4日目67%
症状出現日(感染から5日目)38%
症状出現から3日目(感染から8日目)20%https://t.co/cuTSqhtRgE

— 津川 友介 (@yusuke_tsugawa) May 17, 2020

Results:
Over the 4 days of infection before the typical time of symptom onset (day 5), the probability of a false-negative result in an infected person decreases from 100% (95% CI, 100% to 100%) on day 1 to 67% (CI, 27% to 94%) on day 4. On the day of symptom onset, the median false-negative rate was 38% (CI, 18% to 65%). This decreased to 20% (CI, 12% to 30%) on day 8 (3 days after symptom onset) then began to increase again, from 21% (CI, 13% to 31%) on day 9 to 66% (CI, 54% to 77%) on day 21.

症状ないのにPCRしてもダメという話なので、隔離しかないんだよな。陰性証明意味なし

— みほちゃん (@Mihoko_Nojiri) June 5, 2020

PCR！　PCR！　って叫ぶ人は少なってきたように思う・・・