CI

At a glance

ClinicalIndex Comparison Record
Phase 3Completed· 4,328 enrolled
Drug / intervention
mRNA-1273 +2 morebiological
Likely dose
Not stated in record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT04649151
NCT04649151Phase 3Completed

A Phase 2/3, Randomized, Observer-Blind, Placebo-Controlled Study to Evaluate the Safety, Reactogenicity, and Effectiveness of mRNA-1273 SARS-CoV-2 Vaccine in Healthy Adolescents 12 to <18 Years of Age

ModernaTX, Inc.·interventional·Posted Dec 2, 2020·Updated Sep 15, 2025

In Brief

A Phase 3 clinical trial evaluating mRNA-1273, Placebo, and 1 other intervention for SARS-CoV-2. Completed, enrolled 4,328 participants across 53 sites in 2 countries.

Detailed Summary

The mRNA-1273 vaccine is being developed to prevent COVID-19, the disease resulting from Severe Acute Respiratory Syndrome coronavirus (SARS-CoV-2) infection. The study is designed to primarily evaluate the safety, reactogenicity, and effectiveness of mRNA-1273 vaccine administered as primary series and a booster dose (BD) to an adolescent population. The study will also evaluate the safety and immunogenicity of an mRNA-1273.222 vaccine against the SARS-CoV- 2 omicron variant as a primary series.

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
ConditionsSARS-CoV-2
CountriesDominican Republic, United States

Timeline

Phase 3CompletedFinished
202120222023202420252026
First PostedDec 2, 2020
Enrollment StartDec 9, 2020
Primary CompletionJun 14, 2024
TodayJul 2, 2026
Enrollment to primary: 3.5 yearsPosted 5.6 years ago

Interventions

mRNA-1273biological

Sterile liquid for injection

Placebobiological

0.9% sodium chloride (normal saline) injection

mRNA-1273.222biological

Sterile solution for injection