The estimated number of COVID-19 infections in Wuhan on January 25 , 2020 , was 39 times higher than the number of confirmed cases .
However , cases outside of China have increased by 300 % in the first eleven days in February from 153 cases on 31 Janury to 476 cases on 11 February 2020.. One mathematical model estimated the number of people infected in Wuhan alone at 75,815 as of 25 January 2020 ( 39 times higher than the confirmed case number , ed . ) .
Severe acute respiratory syndrome coronavirus 2