safe. possibly it will be a phased-in booster, with those who are most vulnerable first. as the secretary put it, the president himself plans to get a booster, once it was approved, once his white house physician said it was necessary, he himself would take it. >> dr. jha, questions like the ones i'm about to ask may make physicians nervous because it is a time when americans all sort of fancy themselves armchair epidemiologists. but if you have had moderna or johnson & johnson, is this process, is what they're reviewing relevant to you? are they just reviewing pfizer data? >> yes, so they're reviewing pfizer data right now. they will be reviewing moderna data in the upcoming weeks. what is going to happen, i suspect tomorrow, is a determination by the advisory committee that will officially and technically only be about pfizer. but in the next couple of weeks we will see a determination on