David Holgrave News Today

>> dr. wen, i appreciate you putting this into context for us. i do want to ask about something that ive heard from some doctors that ive spoken with who think that its possible that breakthrough cases are underreported, that the cdc has to collect more information. for instance, on whether people who are vaccinated and do get covid can spread the virus even while asymptomatic. im curious as to what other data you would want to see from the cdc before they issue any further new guidance. >> that...