"I'm sorry it had to come to the rescue:" Dr. Drew Weissman's life work leads to COVID-19 vaccines

For years, Dr. Drew Weissman has researched and created mRNA vaccines. When the COVID-19 pandemic hit nearly two years ago, he and his team at the Perelman School of Medicine at the University of Pennsylvania were positioned to help the world combat the dangerous virus. In an exclusive conversation with KYW Newsradio City Hall Bureau Chief Pat Loeb, the award-winning Weissman explains what it's been like to see his life's work produce such important results, and how mRNA vaccines can be used to fight the coronavirus and other diseases moving forward.