CNN's Sanjay Gupta explains the new type of vaccine being developed by Pfizer and Moderna

CNN's Dr Sanjay Gupta explains the new type of vaccine that pharmaceutical companies Pfizer and Moderna are developing to help fight the coronavirus pandemic.

source https://www.cnn.com/videos/health/2020/11/23/vaccine-technology-coronavirus-pfizer-moderna-gupta-newday-vpx.cnn