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neutralizing antibody and t and b-cell to make us more resistance to the new variants. the confusion is pfizer felt we need it now because of the delta variant. that's less convincing, at least in the publicly available data. right now we know that pfizer is meeting with leadership of hhs and possibly they're going to show us some additional data that none of us have seen before to convince us to move up the timeframe. the bottom line is we've known for a while a third immunization is going to be likely. it's a question of whether it's later in the year next year or whether it's something that's recommended now. i would also add and as elizabeth pointed out, that for im imimmune compromised individuals, a booster might be valuable for them. >> so you say for the most vulnerable, get your extra boost? >> i would. i'm a little reluctant to get too far ahead of my skis with