Spread and control of COVID-19 in China and their associations with population movement, public health emergency measures, and medical resources

Songmin Ying; Fei Li; Xinwei Geng; Zhouyang Li; Xufei Du; Haixia Chen; Sisi Chen; Min Zhang; Zhehua Shao; Yinfang Wu; Madiha Zahra Syeda; Fugui Yan; Luanqing Che; Bin Zhang; Jian Lou; Shaobin Wang; Zhengming Chen; Wen Li; Ye Shen; Zhihua Chen; Huahao Shen

Following the first confirmed COVID-19 case outside of China in Thailand, as of Feb 19 th , 2020, a 138 total of 924 cases have been reported worldwide excluding China (Fig. 1F) . However, the daily 139 cumulative confirmed cases worldwide excluding China grew slowly (Fig. 1G ). Overall, the ratio of secondary to primary cases (S/P ratio), a simple index for measuring the growth 157 of an epidemic, varied greatly across different provincial areas (Fig. 3A) , with Heilongjiang (10.7) 158 and Hong Kong (5.5) being the highest, and Tibet (0) and Qinghai (0.2) being the lowest. However, 159 there was little correlation between total number of confirmed cases and S/P ratio. For example, 160 . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity.