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EFFICACY

Secondary Analyses of Efficacy.
The vaccine efficacy of mRNA-1273 14 days after the second injection was difficult to assess precisely because of the low incidence of Covid-19 in the trial population (four cases in the placebo group and no cases in the mRNA-1273 group) (Figure 3 and Table S7). The vaccine efficacy of mRNA-1273 according to the less stringent CDC definition of Covid-19 with an onset of 14 days after the second injection was 93.3% (95% CI, 47.9 to 99.9) in the per-protocol population and 92.7% (95% CI, 67.8 to 99.2) for cases with an onset of 14 days after the first injection in the mITT1 population (Figure 3 and Fig. S2). For the secondary objectives of prevention of SARS-CoV-2 infection with an onset of 14 days after the second injection (in the per-protocol population) and 14 days after the first injection (in the mITT1 population), the vaccine efficacy estimates for mRNA-1273 were 55.7% (95% CI, 16.8 to 76.4) and 69.8% (95% CI, 49.9 to 82.1), respectively (Figure 3).

The vaccine efficacy of mRNA-1273 was 39.2% (95% CI, −24.7 to 69.7) for asymptomatic infection with an onset of 14 days after the second injection (per-protocol population) and 59.5% (95% CI, 28.4 to 77.3) with an onset of 14 days after the first injection (mITT1 population) (Figure 3). The breakdown of asymptomatic cases starting 14 days after the first dose (mITT1 population) were 14 cases in the mRNA-1273 group and 20 in the placebo group according to RT-PCR results and 15 cases in each group according to serologic results against nucleocapsid (Table S11). The person-years of follow-up were 513 to 522 (6156 to 6264 person-months) in the mRNA-1273 group and 238 to 248 (2856 to 2976 person-months) in the placebo group.

RESULTS
A total of 3732 participants were randomly assigned to receive mRNA-1273 (2489 participants) or placebo (1243 participants). In the mRNA-1273 group, the most common solicited adverse reactions after the first or second injections were injection-site pain (in 93.1% and 92.4%, respectively), headache (in 44.6% and 70.2%, respectively), and fatigue (in 47.9% and 67.8%, respectively); in the placebo group, the most common solicited adverse reactions after the first or second injections were injection-site pain (in 34.8% or 30.3%, respectively), headache (in 38.5% and 30.2%, respectively), and fatigue (in 36.6% and 28.9%, respectively). No serious adverse events related to mRNA-1273 or placebo were noted. The geometric mean titer ratio of pseudovirus neutralizing antibody titers in adolescents relative to young adults was 1.08 (95% confidence interval [CI], 0.94 to 1.24), and the absolute difference in serologic response was 0.2 percentage points (95% CI, −1.8 to 2.4), which met the noninferiority criterion. No cases of Covid-19 with an onset of 14 days after the second injection were reported in the mRNA-1273 group, and four cases occurred in the placebo group.

CONCLUSIONS
The mRNA-1273 vaccine had an acceptable safety profile in adolescents. The immune response was similar to that in young adults, and the vaccine was efficacious in preventing Covid-19. (Funded by Moderna and the Biomedical Advanced Research and Development Authority; Teen COVE

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