Vaccinologist: Here's what worries me about Covid-19 trials
Director of Vaccine Education Center at Children's Hospital of Philadelphia Dr. Paul Offit tells CNN's John King what concerns him about achieving a vaccine for coronavirus. 
Source: Vaccinologist: Here's what worries me about Covid-19 trials How Insurance Companies Work?
Director of Vaccine Education Center at Children's Hospital of Philadelphia Dr. Paul Offit tells CNN's John King what concerns him about achieving a vaccine for coronavirus.
Source: Vaccinologist: Here's what worries me about Covid-19 trials How Insurance Companies Work?
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