Application of COVID-19 pneumonia diffusion data to predict epidemic situation

Zhenguo Wu

The Republic of Singapore COVID-19 2020/01/28-2020/04/09(Rn) The copyright holder for this preprint (which was not peer-reviewed) is the author/funder, who has granted medRxiv a license to display the . https://doi.org/10. 1101 /2020 The Republic of Italy COVID-19 2020/01/28-2020/04/09(Rn) From February 21, 2020 to April 9, 2020, Italy R3, R5 and R7 exceeded the limits respectively (according to the above definition, value 5), and then gradually fell back slowly, being more than 1 for a long time, in an explosive state. After March 31, 2020, R3, R5 and R7 fell back to the fluctuation near 1, and the epidemic is now in a medium development level. The copyright holder for this preprint (which was not peer-reviewed) is the author/funder, who has granted medRxiv a license to display the . https://doi.org/10. 1101 /2020 The Republic of U.S.A COVID-19 2020/01/28-2020/04/09(Rn) From January 5, 2020 to March 5, 2020, the data of the United States is sporadic and irregular. After March 5, 2020, R3, R5 and R7 are out of the limit range (value 5 according to the previous definition), and remain for a long time (R7 = 5 for 20 days). Compared with other countries, this stage is largely due to the lack of early detection and data concentration release.