doses. do you think the definition of fully vaccinated should now change? >> well, you know, as you say, it's a technical, almost semantic definition. and it is the definition for requirements, if someone says, are you fully vaccinated to be able to attend class in a university or college or be able to work in a workplace. right now, kate, i don't see that changing tomorrow or this week or next week. but when you want to talk about optimal protection, i don't think anyone would argue that optimal protection is with a third shot. whether or not it officially gets changed in the definition, i think that will be considered literally on a daily basis. that's always on the table. >> and this discussion has been going on for a bit. with this data coming in this morning, i'm kind of stuck with is it a matter now of when, not if, the definition of fully vaccinated changes? >> my own personal opinion,