Figure 2

Temporal variations of SI and new COVID-19 cases. The changing of SI (A) and newly confirmed weekly cases of COVID-19 (B) in 33 selected countries from the baseline day to late October 2020 were visualized with a heatmap. The symbol “○” indicated the week when the cumulative number of COVID-19 cases reached 100. The 33 countries’ full names can be seen in Table S2.