strength of the delta variant and it left them convinced do this. does it make sense? >> well, it does make sense. we always anticipated that a booster would be necessary. it was a question of when. now, we should be clear these vaccines still prevent serious disease. increasingly we're seeing these milder breakthrough infections, not serious enough to get you into the hospital but people are concerned that over time more of these breakthrough infections might indeed get more serious. let's get ahead of that. let's plan right now a booster campaign so that all of us can get our protection increased when it's our turn. so we look forward to doing that while at the same time getting our reluctant friends who haven't had their first dose yet, please let's get with the program, because that's where