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Pfizer: Protection against Omicron improves after 3 doses

CNN, 08 Dec 2021
CNN's Dr. Sanjay Gupta speaks with Pfizer's Chief Scientific Officer Mikael Dolsten about preliminary lab studies that show a booster of the Pfizer/BioNTech vaccine is needed to neutralize the Omicron variant and that first two doses may not provide sufficient protection. #CNN #News
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