The CDC approved a third shot of Pfizer's Covid-19 vaccine to an expanded group of Americans, but its director says, 'The most vulnerable are those unvaccinated'

Three-quarters of eligible Americans have received at least one dose of a Covid-19 vaccine and some are now able to receive an additional booster shot. But the virus still poses a great threat to more than 70 million eligible people who remain unvaccinated.

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