so the potential good news is that we've seen a substantial rise in virus neutralizing antibody titleers, some tenfold some 30 to 40 fold. so if you're getting a 40 fold drop, there is a likelihood individuals that got three doses will be protected. but we have to confirm those experiments and all of those including those groups that make vaccines including our group, the pfizer moderna people are all now looking at individuals who have gotten those three doses. >> so doctor, cases are rising among children again even though kids 5 to 11 are eligible for the vaccine. kids' vaccines have smaller doses so what do parents need to know there? >> well, the kids even though they have gotten smaller doses, they can respond very robustly to the virus and to the vaccine. so the point is kids who have gotten two doses of the vaccine