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When, not if. i just say get your third shot. forget about what the definition is. i just want to see people be optimally protected. that's what i'm concerned about. if me, that's unequivocally and unquestionably getting a third shot boost. >> but apparently, that may not be enough either. pfizer's ceo raised the possibility of needing a fourth shot to contend with the omicron variant. so what does that mean for defining the fully vaccinated and when does it end? let's ask dr. francis collins, the director of the nih. thanks so much for being here. you know the question. if i'm inoculated but ...

The director of the nih. thanks so much for being here. you know the question. if i'm inoculated but not boosted, do you consider me to be fully vaxxed? >> well, let's try to distinguish between a definition which is being used to decide whether somebody has fulfilled their responsibilities as an employee like all of the people who work for me at nih. in that situation, fully vaccinated means you have had two doses of pfizer or moderna or one of j&j. we're learning those vaccinations do wane in their effectiveness over time. and so boosters are highly recommended for everybody now who is over ...