COVID-19 vaccines are still emergency use. Why hasn’t the FDA given full approval yet?

There has been a lot of talk lately about when we will see the FDA give full approval to some of the COVID-19 vaccines. Which begs the question, what exactly is the difference between the emergency use authorization that the vaccines have been distributed under and full approval? How does the process work, and is not having full approval hurting vaccination efforts? Dr. Charles B. Cairns, the Walter H. and Leonore Annenberg Dean and senior vice president of medical affairs at Drexel University's College of Medicine joins KYW Newsradio In Depth to talk about the difference between emergency use and full approval, how the FDA views the COVID-19 vaccines, and what mRNA technology means for science and public health moving forward.