R0, or the basic reproduction number/rate, refers to the contagiousness and transmissibility of infectious pathogens. R0 varies depending on a variety of factors and is critical in public health management to ensure infectious epidemics (or global pandemics) are controlled.
As such, COVID-19 is likely to be more contagious than the seasonal flu, the 2003 SARS virus, and perhaps even the common cold. The reason for COVID-19 being more contagious than SARS is thought to be due to a much higher affinity of the virus to its receptor. 2b1af7f3a8