It's really simple to understand. There are three main reasons:
The (RO) for the Covid-19 is high about 1.6-2.6 according to the Lancet or a avg of 2.1(RO)
thelancet.com/journals/lanin…
ncbi.nlm.nih.gov/pubmed/2518637…(IQR,six%20R%20values%20were%20%3C1.
Hope this helps calm some people and to increase others concern so we all get to a stable state and can take the needed actions.