class at a university or a college or be able to work in a workplace. right now, kate, i don't see that changing tomorrow or next week, but certainly if you want to talk about what optimal protection is, i don't think anybody would argue that optimal protection is going to be with a third shot. whether or not it officially gets changed in the definition, i think that's going to be considered literally on a daily basis. that's always on the table. you know, my own personal opinion, kate, is what you said is correct. it will be a matter of when, not if. >> doctor, how soon do you think that should happen? should there be a sense of urgency now with omicron? >> well, i think there is. i think the question as dr. fauci says, is what is considered good enough and what is considered optimal. to me, given what we learn about omicron and what we learn about protection, getting a third dose, a booster dose, i would say the optimal immunization is to get, you know, three doses. that should be your series of