MSNBC Hallie Jackson Reports March 18, 2022 19:34:00
Fourth shot gives people who already have immunity a little bit more. but it doesn't give you that much more protection against omicron or the b.a. 2 one that we'reied about. this just tells me, i think, it's not really a fourth shot. i'm starting to think of this as a seasonal shot. i mate different, the form l.a. the flu shot every year differs. but think of this as, hey, we're just going to need a little bit of a boost at a regular interval. now we need to figure out who, what, when and where. how many months since your third? which priority population, and when do you need to get it? >> do...