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.
from CNN.com - RSS Channel - HP Hero https://www.cnn.com/videos/health/2020/05/24/coronavirus-covid-19-vaccine-trials-vaccinologist-concern-ip-vpx.cnn
via https://www.cnn.com/index.html
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