Gov. Andrew M. Cuomo said this week that vaccinations are set to be cleared for 12- to 15-year-olds.

Clinical trials have found that children in the age group may safely receive the dose already available for adults, and indicate that it is highly effective at preventing symptomatic illness.

Pfizer and BioNTech have begun testing the vaccine in children ages 2 to 11. If trial results are positive, the companies expect to apply to the F.D.A. in September for emergency authorization to administer doses to those age groups.

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