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The preliminary results appeared to show that three doses of the vaccine worked better than two.

Both Moderna and Pfizer-BioNTech have asked the agency to approve their vaccines for the youngest children.

Researchers combined Moderna’s existing vaccine with one designed to attack the Beta variant, and found it provided a stronger defense against several variants.

People in the age group can get the additional shot at least four months after their first booster. Those 12 and older with certain immune...

Federal officials appear to be coalescing around a plan to offer people 65 and older — and possibly some younger adults — the option of...

The company said the vaccine produced a strong immune response in children younger than 6, but proved only about 40 percent effective in preventing symptomatic...

The move could further inflame a tortuous debate among scientists over when the coronavirus vaccines’ protection should be bolstered, and for whom.

A Food and Drug Administration official said the best time for an additional shot may be fall, when the spread of the coronavirus is expected...

The company’s finding is based on only a small study of blood samples in a laboratory, but others are sure to follow.

In a turnaround, the agency is expected to grant the request before the winter holiday season, giving access to all 181 million fully vaccinated people.