Demystifying the Vaccine

A recent vaccine trial from Oxford University shows promising preliminary results, suggesting the vaccine can produce immune responses that may protect people against infection. Dr. Sanjay Gupta spoke with Dr. Barney Graham, the deputy director of the Vaccine Research Center at the National Institutes of Health, about the science behind vaccines and how they work. To learn more about how CNN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices