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CDC approves Pfizer COVID booster shot for 20 million Americans

Twenty million Americans are now eligible for the Pfizer COVID-19 booster shot. The CDC and FDA approved a third dose for people who are 65 and older, at high risk of serious disease or frequently exposed to the virus. Dr. William Schaffner, a member of the CDC's advisory committee on immunization practices, joins CBSN's Lana Zak to answer questions on the booster shot rollout.
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