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Coronavirus live updates: Omicron variant could require fourth vaccine dose – The Washington Post

Coronavirus live updates: Omicron variant could require fourth vaccine dose  The Washington PostPfizer CEO says fourth Covid vaccine doses may be needed sooner than expected due to omicron  CNBCWall St closes higher as vaccine update feeds optimism  ReutersProtection against Omicron coronavirus variant improves with three vaccine doses, Pfizer says  CNNWhy scientists think our immune systems will be primed to fight the omicron variant  Yahoo News

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