https://www.thelancet.com/journals/lanmic/article/PIIS2666-5247(24)00245-3/fulltext
A study of 1,196 adolescents in the US found that the Novavax COVID-19 vaccine (NVX-CoV2373) was 73.5% effective at preventing SARS-CoV-2 infection, including asymptomatic cases.