Doctor behind Covid-19 vaccine development explains how shot was years in the making

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UP NEXT
Dr. Ezekiel Emanuel: 'We're still having 125,000 deaths from COVID a year.'
06:55
Measles Outbreak: More than two dozen kids hospitalized
04:35
Newly Approved Covid-19 Booster for B-A5 Omicron Subvariant
04:25
How to Properly Assess Impact of COVID as Regulations Relax
06:01
The Newest Group to Qualify for the Covid Vaccine
06:09
Dr. Hotez: Moderna’s coronavirus vaccine for children under 6 is ‘potentially promising’ but not ‘a slam dunk’
04:52