What is the basic reproduction number (R0) of SARS-CoV-2?
It is difficult to determine as it varies greatly from country to country, depending on how well countries control their epidemics with widespread testing, case isolation and vigorous contact tracing, testing and isolation if positive. In countries that do this well, the R0 can be very low indeed. In countries that fail to control the spread of the virus, the R0 is high but unknown as SARS-CoV-2 spreads untested and therefore undetected. It has been estimated to be ~2.2.214