Figure 1.

(A) Epidemic curve of confirmed coronavirus disease 2019 (COVID-19) cases reported in Jiangsu Province, Eastern China, by February 14, 2020 (data from February 15 were not available because since February 14, there has been no report on new confirmed cases). First-generation infection was defined as those who had a history of travel and residence in Wuhan City and surrounding areas or other communities with reported cases. Second-generation infection was defined as those who had contact with people from Wuhan City and surrounding areas or other communities with reported cases. Third-generation infection was defined as those who had contacted a locally confirmed or probable COVID-19 case. Unclear were defined as cases that did not belong to the above 3 categories and whose exposure sources cannot be traced. (B) R_t (time-dependent reproductive number, R_t) in different epidemic stages in Jiangsu Province, Eastern China, by February 14, 2020. The darkened horizontal line indicates R_t=1, below which sustained transmission is unlikely as long as the anti-transmission measures are sustained, indicating that the outbreak is under control. The 95% confidence intervals (Cls) are presented as shaded values.