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Three new laboratory studies show troubling signs that two doses of the Pfizer-BioNTech coronavirus vaccine may not fully protect against the omicron variant. But the research also suggests that three doses may provide much better protection.

New yorkUnited statesSouth africaSouth africanJohn mooreLafraniere weilandAlex sigalAlbert bourlaJohnson achenbachDouglas hinshawStephen goldsteinNew york timesWashington postUniversity of utahRochelle walenskyWeill cornell