>> there is suggestive evidence comparing delta. this is from studies in singapore, in scotland, in canada, that, in fact, this is not just more contagious, but more serious in various age groups. it's not as solid as i wish it was. we don't have really enough numbers to be confident, but it certainly tilts the balance in that direction. >> i think you need to emphasize that if you see evidence of that. that's a change. before, the big concern was that kids could get it, pass it to others but by in large they weren't becoming ill in great numbers in any kind of numbers that were causing deep concern. now you're saying they can get sick enough that this is a worry. >> it's sick enough it can be a worry. it frankly was before and perhaps it was underemphasized. in part now because older people who are vaccinated are not so much filling up hospitals. the average age has dropped significantly. so now we see perhaps in this

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