request for emergency authorization to the fda any day now. with this, the first vaccine for kids under 5, you know parents have a lot of questions, like dosage, any side effects, what exactly immunobridging is, whether you've heard that term before or not. critical care pulmonologist and msnbc medical contributor and dad himself, by the way, dr. vin gupta. can you explain to us what is pfizer basing this on? parents of young kids will think back to what many saw as disappointing news, when they initially came out and said, hey, two shots doesn't trigger the immune response we would like to see for kids in this age group. what has changed? >> hallie, good afternoon are you thank you for the opportunity to talk about this very important issue for everybody out there. this is welcome news not only for parents but welcome across the pediatrician community. my wife, a pediatrician, was