Fig. 8

Epidemic trends in major global countries. *The length of time from the first report to the period of rapid rise in different countries varied based on the difference of applicable conditions of nucleic acid detection and the national control strategies. The ordinate represents the cumulative number of confirmed cases. The lower right curves indicate the countries with the top 10 confirmed cases worldwide on April 21. Most of them entered the rapid growth phase within 1 month. The top left curves indicate the countries with the top 10 populations (except the USA, China, and Russia, which are already in the lower right). Most of them were starting to show a strong upward trend, which suggested a high risk in the next few weeks