Basic safety, Immunogenicity, and Efficacy of the BNT162b2 Covid-19 Vaccine in Adolescents

Tom Smith

Goals, Participants, and Oversight We conducted a randomized, placebo-managed, observer-blinded, section 3 trial as component of a phase 1–2–3 demo assessing BNT162b2 safety, immunogenicity, and efficacy in balanced persons 12 yrs of age or older. This report offers conclusions from 12-to-15-yr-previous contributors enrolled in the United States, such as descriptive […]

Goals, Participants, and Oversight

We conducted a randomized, placebo-managed, observer-blinded, section 3 trial as component of a phase 1–2–3 demo assessing BNT162b2 safety, immunogenicity, and efficacy in balanced persons 12 yrs of age or older. This report offers conclusions from 12-to-15-yr-previous contributors enrolled in the United States, such as descriptive comparisons of security involving participants in that age cohort and those people who had been 16 to 25 decades of age and an evaluation of the noninferiority of immunogenicity in the 12-to-15-yr-old cohort to that in the 16-to-25-year-aged cohort. Information were collected as a result of the cutoff day of March 13, 2021.

Eligible contributors had been healthier or had secure preexisting disorder (together with hepatitis B, hepatitis C, or human immunodeficiency virus infection). Persons with a prior scientific or virologic Covid-19 diagnosis or SARS-CoV-2 infection, earlier coronavirus vaccination, analysis of an immunocompromising or immunodeficiency condition, or treatment with immunosuppressive treatment (which include cytotoxic brokers and systemic glucocorticoids) have been excluded.

The ethical perform of the demo is summarized in the Supplementary Appendix, available with the total text of this article at More aspects of the trial are offered in the protocol, obtainable at Pfizer was liable for the demo design and conduct, info assortment, data assessment, data interpretation, and crafting of the manuscript that was submitted. Both equally Pfizer and BioNTech made the vaccine and placebo. BioNTech was the regulatory sponsor of the demo and contributed to information interpretation and creating of the manuscript. All info ended up obtainable to the authors, who vouch for their precision and completeness and for the adherence of the demo to the protocol.


Randomization was carried out with the use of an interactive World-wide-web-based mostly reaction process. Individuals have been assigned in a 1:1 ratio to get two intramuscular injections of 30 μg of BNT162b2 or placebo (saline) 21 days aside. For evaluation of speedy vaccine-affiliated reactions, participants had been observed in the clinic for 30 minutes soon after vaccination.


Safety aims incorporated the assessment of area or systemic reactogenicity events, which ended up recorded by the members in an electronic diary (e-diary) for 7 times immediately after each individual dose. Unsolicited adverse occasions (i.e., those described by the participant with out e-diary prompting) and critical adverse occasions had been also recorded from receipt of the first dose through 1 month and 6 months right after dose 2, respectively.


Immunogenicity assessments (SARS-CoV-2 serum neutralization assay and receptor-binding domain [RBD]–binding or S1-binding IgG direct Luminex immunoassays) had been performed just before vaccination and 1 month following dose 2, as described previously.3 The immunogenicity objective was to exhibit noninferiority of the immune reaction to BNT162b2 in 12-to-15-yr-aged participants as when compared with that in 16-to-25-year-outdated individuals. Noninferiority was assessed among the members who experienced no evidence of former SARS-CoV-2 an infection with the use of the two-sided 95% assurance interval for the geometric indicate ratio of SARS-CoV-2 50% neutralizing titers in 12-to-15-12 months-outdated members as as opposed with 16-to-25-12 months-previous individuals 1 month soon after dose 2. BNT162b2 immunogenicity was evaluated in participants with and individuals without having serologic or virologic evidence of past SARS-CoV-2 infection. Corresponding close factors were the geometric signify SARS-CoV-2 neutralizing titers at baseline (i.e., instantly prior to receipt of the 1st injection) and 1 thirty day period just after dose 2 and geometric imply fold rises (GMFRs) in titers from baseline to 1 thirty day period soon after dose 2.


The efficacy of BNT162b2 from verified Covid-19 with an onset 7 or additional times after dose 2 was summarized in members who did not have proof of past SARS-CoV-2 an infection, as effectively as in all vaccinated members. Surveillance for possible Covid-19 cases was undertaken during the demo if acute respiratory sickness made in a participant, the participant was analyzed for SARS-CoV-2. Methods for identifying SARS-CoV-2 bacterial infections and Covid-19 diagnoses are summarized in the Supplementary Appendix.

Statistical Investigation

The safety populace bundled all members who acquired at the very least one particular dose of BNT162b2 or placebo. The reactogenicity subset incorporated all 12-to-15-12 months-aged participants and a subset of 16-to-25-year-outdated members (all those who gained an e-diary to record reactogenicity events). Basic safety finish points are presented descriptively as counts, percentages, and related Clopper–Pearson two-sided 95% self confidence intervals, with adverse functions and significant adverse situations explained in accordance to phrases in the Professional medical Dictionary for Regulatory Pursuits, edition 23.1, for just about every group.

Immunogenicity was assessed in a random subset of participants in every single age cohort with the use of a easy random-sample variety method. For immunogenicity assessments, all members in both age cohorts were being from U.S. internet sites. The dose 2 immunogenicity populace that could be evaluated provided participants who underwent randomization and received two BNT162b2 doses in accordance with the protocol, gained dose 2 inside of the prespecified window (19 to 42 times just after dose 1), had at least a single valid and determinate immunogenicity end result from a blood sample received inside 28 to 42 times soon after dose 2, and had no main protocol deviations. Noninferiority of the immune reaction to BNT162b2 in 12-to-15-yr-previous participants as when compared with that in 16-to-25-12 months-outdated participants was assessed on the basis of the geometric suggest ratio of SARS-CoV-2 50% neutralizing titers. A sample of 225 BNT162b2 recipients who could be evaluated (or 280 BNT162b2 recipients overall) in just about every age cohort was believed to present 90.8% energy for declaring noninferiority (described as a decreased restrict of the 95% self-assurance interval for the geometric signify ratio of >0.67). A screening laboratory offer limitation of the capable viral great deal utilized for assay validation and scientific screening resulted in the demo acquiring less participants than expected for the immunogenicity analyses. Calculations of the geometric suggest ratios, geometric necessarily mean titers, and GMFRs are explained in the Supplementary Appendix.

Though the official evaluation of efficacy was to be centered on the in general success obtained throughout all age cohorts, the statistical investigation system specified that descriptive efficacy summaries would be delivered for each age cohort (the stratification component). The efficacy examination for the 12-to-15-calendar year-previous cohort was planned as a descriptive investigation for the reason that the selection of cases that would occur in the age subgroups was unknown. The efficacy inhabitants that could be evaluated integrated all qualified 12-to-15-yr-aged contributors who underwent randomization and gained two doses of BNT162b2 or placebo, been given dose 2 within the prespecified window (19 to 42 days following dose 1), and had no major protocol deviations. The all-available efficacy populace integrated all members who gained one or two doses. Vaccine efficacy was defined as 100×(1−IRR), in which IRR is the ratio of the fee of a initial confirmed Covid-19 health issues in the BNT162b2 team to the corresponding rate in the placebo team. Two-sided Clopper–Pearson 95% assurance intervals were calculated (not adjusted for many comparisons). Because the quantity of contributors who claimed signs and symptoms but were missing a valid polymerase-chain-reaction exam end result was little, data for these participants had been not imputed in the assessment.

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