you very well against symptomatic infection. and if i'm getting together with other people, i would want to make sure that those around me don't have symptomatic covid. >> sanjay, why aren't state and federal officials on the same page here? or are they? >> well, i mean, if you look at the cdc's guidelines, i think they've been pretty clear on this. but let me show you i think as you have data emerging on this in terms of the protectiveness, and we're still learning, we can look at how well these vaccines alone without the booster protect and then see what the booster sort of does. initially when you look at the up to nine weeks you do get good protection against delta and omicron. but clearly as leana was talking about it does sort of start to diminish significantly for omicron by week 20 or so. but then if you get the boosters you get a pretty significant, within two weeks return of some protection. still a little diminished, but it's a lot better than at 20 weeks. i think this data's emerging,