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over it? what is it saying? >> reporter: well, i think what we're seeing, michael, is that there are steps to this process. and right now pfizer, as the innovator in this field, is way ahead of the regulators, right, which quite naturally and by definition almost come downstream of the innovators. so the vaccine inventor, pfizer in this case, is looking at the data, and for the very, very first time we have six months of data that we can look at in the countries that were most advanced in vaccination and that started vaccinating early. that is israel. if you think about it in the uk, we started vaccinating very early december, so we're just a few weeks ago past the six-month mark where we can start collecting six months of data and looking at it. pfizer is looking at that data and seeing one thing. it has not yet published a comprehensive study that has been published in a peer review journal. that would have to happen. and then the regulators will be able to determine whether essentially they agree with pfizer's assessment or not.