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Regulators are set to clear extra doses of Pfizer-BioNTech’s vaccine as soon as Thursday, after states began expanding eligibility on their own.

Experts said the shot could bring relief to parents anxious about their children getting sick, though some worry that those most at risk may slip...

The agency will also allow vaccine recipients to pick which vaccine they want as a booster, endorsing a mix-and-match approach.

Regulators said that people over 65 or at high risk of severe Covid-19 were eligible for an extra shot, setting up a staggered national booster...