Asymptomatic transmission of covid-19

December 21, 2020

BMJ

Allyson M Pollock, professor of public health1, James Lancaster, independent researcher

What we know, and what we don’t

The UK’s £100bn “Operation Moonshot” to roll out mass testing for covid-19 to cities and universities around the country raises two key questions. How infectious are people who test positive but have no symptoms? And, what is their contribution to transmission of live virus?