CAMBRIDGE (CBS) — Moderna says its vaccine is 96% effective in protecting kids between 12 and 17 years old against COVID-19. That data is from a study of more than 3,2000 participants who received at least one dose of the vaccine.

The Cambridge-based biotech company also said none of the participants had severe reactions to the first or to the second shot.

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“No serious safety concerns have been identified to date,” Moderna said about the trial on teens.

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Moderna said another study of the vaccine on children 6 months to 11 years old is ongoing but didn’t give further details.

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Earlier this week Moderna, which is expanding its manufacturing plant and lab in Norwood, said a third vaccine booster dose it developed shows it works against the more contagious South African and Brazilian variants.