Initial estimates of the basic reproduction number ( R0 ) for COVID-19 in January were between 1.4 and 2.5 , but a subsequent analysis has concluded that it may be higher ( between 3.8 and 8.9 ) . < gallery mode= '' nolines '' widths= '' 320 '' heights= '' 220 '' >
The basic reproduction number of COVID-19 was estimated to be 5.7 after January 2020 with a probability of 95 % of it being between 3.8 and 8.9 .