Fig. 3

Time distribution of the number of confirmed cases and counties with the first diagnosed cases in Sichuan Province (mainland cases). *The maximum number was the third and fourth days after the Wuhan lockdown. The rapid increase was particularly obvious in the first two weeks. January 21, with the first confirmed case, the Sichuan CDC launched an emergency response. January 24, Sichuan government launched the first-level response to major public health incidents. February 5, commencement of district classification prevention and control at the city level. February 13, commencement of district classification prevention and control at the county level. February 26, Sichuan government reduced the response to level 2. March 4, the last local cases in the first wave of the epidemic. March 18, establishment of a thematic working group on overseas imported cases. March 25 reduced the response to level 3. From March 17 to April 6, a total of 21 overseas imported cases were reported in Sichuan