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Course: Long-term Effectiveness Associated With the BNT162b2 Vaccine Against SARS-CoV-2 Infection Among Adolescents in South Korea

CME Credits: 1.00

Released: 2022-08-17

The emergence of the SARS-CoV-2 Omicron variant has resulted in a surge of COVID-19 cases among adolescents. We estimated the effectiveness associated with the BNT162b2 vaccine against SARS-CoV-2 infection and critical infection among adolescents in South Korea.
In this cohort study, we compared the rates of SARS-CoV-2 infection and critical infection by age, census region, vaccination status, and vaccine doses in all adolescents aged 12 to 18 years in South Korea between July 19, 2021, and January 22, 2022. Infection was defined as symptomatic or asymptomatic SARS-CoV-2 positivity as confirmed by polymerase chain reaction and/or rapid antigen testing. Critical infection was defined as hospitalization for COVID-19 with high-flow oxygen therapy, mechanical ventilation, extracorporeal membrane oxygenation, or continuous kidney replacement therapy within 28 days of laboratory confirmation of SARS-CoV-2 positivity. A time-dependent Cox proportional hazards regression model was used, and hazard ratios (HRs) with 95% CIs from an adjusted model with covariates (sex, age, days elapsed since vaccination, census region, immunocompromised status) were calculated to estimate vaccine effectiveness as (1???HR)?×-100. Person-days comprised the number of follow-up days of adolescents who were never vaccinated and days contributed by adolescents before being vaccinated or censored (eFigures 1 and 2 in the ).


Educational Objective
To identify the key insights or developments described in this article


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