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Moderna said majority of the side effects in the trial, which had 4,753 participants, were mild or moderate in severity, with fatigue, headache, fever and injection site pain the most common.
However, the U.S. Food and Drug Administration is yet to authorize the vaccine for use in adolescents aged 12 through 17. Sweden has paused the use of the Moderna vaccine for younger age groups after reports of cases of heart inflammation in young adults.