Table 1. First Week to Show an Increase Over Two Consecutive Previous Weeks and Peak Week for Key Surveillance Indicators of COVID-19, by COVID-19 Epidemic Wave, Japan, from Week 8, 2020 to Week 7, 2021 (as at February 28, 2021)a.

From: Epidemiology of Coronavirus Disease 2019 in Japan: Descriptive Findings and Lessons Learned through Surveillance during the First Three Waves

1) No. positive cases 2) No. tests 3) Test positivity 4) Average no. hospitalized cases 5) Average no. hospitalized severe cases 6) No. deaths
First wave
First week with increase over two consecutive weeks* 8 8 8 8 8 14
Peak week 15 20 8, 15 18 18 18**
Second wave
First week with increase over two consecutive weeks 25 24 25 27 30 31
Peak week 32 33 30, 31 33 34 35
Third wave
First week with increase over two consecutive weeks 41 43*** 42 45 43 47
Peak week 1 3 53 3 3 5
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