how significant is significant? >> i want to wait and see what they say because the sigcience limited. a study from the national ins stults of health demonstrated moderna or pfizer, regardless of what they got for the first one got the best boost. those who got j & j, giving them the pfizer got a better boost than from the j & j. we have stock in the country but the data are saying mrna boosters do a better job. 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 nda commissioner, scott gottlieb, is calling for urgent research into a mutation of the delta variant known as delta plus, following a surge of