There's been so much breaking news about vaccines in the last week -- most of it good but not all. Pfizer says its vaccine is highly effective six months after the second shot. The Pfizer and Moderna shots have been proven safe for adolescents. J&J tossed millions of doses because of a manufacturing error. And the CDC says that Pfizer and Moderna's vaccines work just as well in real life as the trials, and that they are 80% effective after just the first dose. These headlines raise a lot of questions, like, if Pfizer's first dose is so effective, do we need both doses? Could kids be vaccinated before school starts in the fall? We brought these questions and more to Dr. Paul Offit, Director of the Vaccine Education Center at the Children's Hospital of Philadelphia and Professor of Pediatrics at Penn's Medical School. 

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