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a moment to mark in the battle against the pandemic. more than 200 million americans are fully vaccinated against covid, more than 60% of the population. the rate of vaccinations has ticked up in recent weeks over concerns about the omicron variant. following yesterday s news from pfizer about booster doses holding up to that variant, pfizer s ceo also is now talking about a possible fourth dose. i think we will need a fourth dose. with the previews, i was pr projecting that would be on 12 months after the third dose. with omicron, we need to wait and see because we have very little information. we may need it faster. joining me right now is dr. carlos del rio, associate dean of emery school of medicine at grady health system. what do you think of what albert bourla is saying this morning about a possible fourth dose? good morning, kate.

200 millionOmicron variantKate bolduanEmery school of medicine at grady health systemCarlos del rioAssociate dean