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>> is this a case where, do you think well be able to get data to find out, for instance, if youve had covid, maybe you only need one shot of a pfizer and that will be sufficient? is that the kind of research you think well be able to have in hand soon? >> yeah, i believe so. im not so sure how soon, but certainly thats an important question, is being asked continually, particularly since we know you get a shot following natural infection and recovery, you get a very good immune response. so tha...