foundation was founded with money from the johnson family fortune and we have stock in the company. but the data are saying that the mrna boosters do a better job. i'll be interested to see what fda says because there is limited data, and it's very confusing right now for people who want to get boosters, having them available for some but not for everybody. >> the former fda commissioner scott gottlieb is calling for urgent research into a mutation of the delta variant known as delta+ following a surge of cases in the uk. when i first read this, i said, here we go again. covid numbers in the u.s. have been improving recently. how worried are you that this could throw us off course again? >> well, we need to remain vigilant. whether this variant will turn out to be a problem or not, until this is controlled everywhere in the world, we all remain at risk. and the vaccine numbers in the u.s. have been improving, but they're not as high as they