not all anecdotes are symmetric. there is a little bit of asymmetry. if we were to hear we had a lot of icus full of people who had been boosted and on ventilators, i think a small number of cases would alarm us. so right now, it is too soon to know the severity of these conditions on a -- on a systemic population level. i do think that it's reasonable to prognosticate and to guess that this is breaking through people who have had vaccine or booster. the question is, as you say, is it really just an example of the vaccine doing what they were always designed to do? they were always designed to do stop the serious suffering, the bad outcomes and we got this gift in terms of the effect -- the infection protection. which that clearly was a short -- shorter-term thing. and that we can boost to -- to -- to get that better. but really, these vaccines were always designed to keep the worst outcomes from occurring. and even in the delta period, i think we saw them hold up remarkably well. greet study out in the new england journal of medicine this