Scientists in Philadelphia have been working hard on a COVID-19 vaccine at the Wistar Institute at the University of Pennsylvania, in partnership with INOVIO Pharmaceutical. Dr. David Weiner is the Director of the Wistar Institute's Vaccine Center and co-founder of INOVIO. We wanted to check in with him to see what they've learned about the virus, how their vaccine development is going, and to get his take on the vaccines we've heard about in the news that are pretty close to the finish line. 

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