In a study of 844,000 children and adolescents without prior COVID infection, vaccine effectiveness was approximately 61% in children and 67% in adolescents versus the delta variant, but only approximately 16% and 26%, respectively, versus omicron.
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In a study of 844,000 children and adolescents without prior COVID infection, vaccine effectiveness was approximately 61% in children and 67% in adolescents versus the delta variant, but only approximately 16% and 26%, respectively, versus omicron.