How ‘Superspreading’ Events Drive Most COVID-19 Spread

As scientists have learned more about COVID-19, it has become clear that so-called superspreader incidents—in which one person infects a disproportionate number of other individuals—have played an oversized role in the transmission of the virus that causes the disease.

K number: what is the coronavirus metric that could be crucial as lockdown eases?

K sheds light on the variation behind R. “Some [infectious] people might generate a lot of secondary cases because of the event they attend, for example, and other people may not generate many secondary cases at all,” said Dr Adam Kucharski. “K is the statistical value that tells us how much variation there is in that distribution.”