i got moderna. in january we're both eligible if they're rolled out. i certainly think that there is going to be safety in mixing and matching. pfizer is fully approved. it can be used off label. that can be given as an extra dose to anyone who got any other vaccines under the regulatory framework. and i think the safety data that exists in the uk and in israel would tell us that the safety will be there. i think there won't be a problem. here's dr. fauci on that issue. >> right now we are suggesting and hopefully it will work out that way, that if you got pfizer, you will then boost with pfizer. if you get moderna, you'll be boosting with moderna. we are doing the studies to determine if we can do just that, switch one with the other. >> lall right. that's a perspective from a variation of folks on the medical front. dr. rob davidson, hopefully he can join us again. we lost the signal.