In the case of SARS-CoV-2, evidence is growing that superspreading is a hugely significant factor of total transmission…

In our study, just 20 percent of cases, all of them involving social gatherings, accounted for an astonishing 80 percent of transmissions. (That, along with other things, suggests that the dispersion factor, k, of SARS-CoV-2 is about 0.45).

Another 10 percent of cases accounted for the remaining 20 percent of transmissions — with each of these infected people on average spreading the virus to only one other person, maybe two people. This mostly occurred within households.

No less astonishing was this corollary finding: Seventy percent of the people infected did not pass on the virus to anyone.