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    Summary
    EudraCT Number:2026-000101-14
    Sponsor's Protocol Code Number:mRNA-1273-P403
    Clinical Trial Type:Outside EU/EEA
    Date on which this record was first entered in the EudraCT database:2026-05-28
    Trial results
    Index
    A. PROTOCOL INFORMATION
    B. SPONSOR INFORMATION
    C. APPLICANT IDENTIFICATION
    D. IMP IDENTIFICATION
    D.8 INFORMATION ON PLACEBO
    E. GENERAL INFORMATION ON THE TRIAL
    F. POPULATION OF TRIAL SUBJECTS
    G. INVESTIGATOR NETWORKS TO BE INVOLVED IN THE TRIAL
    H.4 THIRD COUNTRY IN WHICH THE TRIAL WAS FIRST AUTHORISED
    Expand All   Collapse All
    A. Protocol Information
    A.2EudraCT number2026-000101-14
    A.3Full title of the trial
    A Phase 3b/4, Open-label Study to Assess the Immunogenicity and Safety of mRNA COVID-19 Variant-containing Vaccine Formulations
    A.3.1Title of the trial for lay people, in easily understood, i.e. non-technical, language
    A Study to Investigate the Immunogenicity and Safety of mRNA COVID-19 Variant-containing Vaccine Formulations
    A.4.1Sponsor's protocol code numbermRNA-1273-P403
    A.5.2US NCT (ClinicalTrials.gov registry) numberNCT06585241
    A.7Trial is part of a Paediatric Investigation Plan No
    A.8EMA Decision number of Paediatric Investigation Plan
    B. Sponsor Information
    B.Sponsor: 1
    B.1.1Name of SponsorModernaTX, Inc.
    B.1.3.4CountryUnited States
    B.3.1 and B.3.2Status of the sponsorCommercial
    B.4 Source(s) of Monetary or Material Support for the clinical trial:
    B.4.1Name of organisation providing supportModernaTX, Inc.
    B.4.2CountryUnited States
    B.5 Contact point designated by the sponsor for further information on the trial
    B.5.1Name of organisationModernaTX, Inc.
    B.5.2Functional name of contact pointModerna WeCare Team
    B.5.3 Address:
    B.5.3.1Street Address325 Binney Street
    B.5.3.2Town/ cityCambridge, MA
    B.5.3.3Post code02142
    B.5.3.4CountryUnited States
    B.5.4Telephone number1866663-3762
    B.5.6E-mailWeCareClinicalTrials@modernatx.com
    D. IMP Identification
    D.IMP: 1
    D.1.2 and D.1.3IMP RoleTest
    D.2 Status of the IMP to be used in the clinical trial
    D.2.1IMP to be used in the trial has a marketing authorisation No
    D.2.5The IMP has been designated in this indication as an orphan drug in the Community No
    D.2.5.1Orphan drug designation number
    D.3 Description of the IMP
    D.3.1Product namemRNA-1273.167
    D.3.2Product code mRNA-1273.167
    D.3.4Pharmaceutical form Injection
    D.3.4.1Specific paediatric formulation No
    D.3.7Routes of administration for this IMPIntramuscular use
    D.3.11 The IMP contains an:
    D.3.11.1Active substance of chemical origin No
    D.3.11.2Active substance of biological/ biotechnological origin (other than Advanced Therapy IMP (ATIMP) Yes
    The IMP is a:
    D.3.11.3Advanced Therapy IMP (ATIMP) No
    D.3.11.3.1Somatic cell therapy medicinal product No
    D.3.11.3.2Gene therapy medical product No
    D.3.11.3.3Tissue Engineered Product No
    D.3.11.3.4Combination ATIMP (i.e. one involving a medical device) No
    D.3.11.3.5Committee on Advanced therapies (CAT) has issued a classification for this product No
    D.3.11.4Combination product that includes a device, but does not involve an Advanced Therapy No
    D.3.11.5Radiopharmaceutical medicinal product No
    D.3.11.6Immunological medicinal product (such as vaccine, allergen, immune serum) Yes
    D.3.11.7Plasma derived medicinal product No
    D.3.11.8Extractive medicinal product No
    D.3.11.9Recombinant medicinal product No
    D.3.11.10Medicinal product containing genetically modified organisms No
    D.3.11.11Herbal medicinal product No
    D.3.11.12Homeopathic medicinal product No
    D.3.11.13Another type of medicinal product No
    D.IMP: 2
    D.1.2 and D.1.3IMP RoleTest
    D.2 Status of the IMP to be used in the clinical trial
    D.2.1IMP to be used in the trial has a marketing authorisation Yes
    D.2.5The IMP has been designated in this indication as an orphan drug in the Community No
    D.2.5.1Orphan drug designation number
    D.3 Description of the IMP
    D.3.1Product namemRNA-1273.712
    D.3.2Product code mRNA-1273.712
    D.3.4Pharmaceutical form Injection
    D.3.4.1Specific paediatric formulation No
    D.3.7Routes of administration for this IMPIntramuscular use
    D.3.11 The IMP contains an:
    D.3.11.1Active substance of chemical origin No
    D.3.11.2Active substance of biological/ biotechnological origin (other than Advanced Therapy IMP (ATIMP) Yes
    The IMP is a:
    D.3.11.3Advanced Therapy IMP (ATIMP) No
    D.3.11.3.1Somatic cell therapy medicinal product No
    D.3.11.3.2Gene therapy medical product No
    D.3.11.3.3Tissue Engineered Product No
    D.3.11.3.4Combination ATIMP (i.e. one involving a medical device) No
    D.3.11.3.5Committee on Advanced therapies (CAT) has issued a classification for this product No
    D.3.11.4Combination product that includes a device, but does not involve an Advanced Therapy No
    D.3.11.5Radiopharmaceutical medicinal product No
    D.3.11.6Immunological medicinal product (such as vaccine, allergen, immune serum) Yes
    D.3.11.7Plasma derived medicinal product No
    D.3.11.8Extractive medicinal product No
    D.3.11.9Recombinant medicinal product No
    D.3.11.10Medicinal product containing genetically modified organisms No
    D.3.11.11Herbal medicinal product No
    D.3.11.12Homeopathic medicinal product No
    D.3.11.13Another type of medicinal product No
    D.IMP: 3
    D.1.2 and D.1.3IMP RoleTest
    D.2 Status of the IMP to be used in the clinical trial
    D.2.1IMP to be used in the trial has a marketing authorisation Yes
    D.2.5The IMP has been designated in this indication as an orphan drug in the Community No
    D.2.5.1Orphan drug designation number
    D.3 Description of the IMP
    D.3.1Product namemRNA-1273.251
    D.3.2Product code mRNA-1273.251
    D.3.4Pharmaceutical form Injection
    D.3.4.1Specific paediatric formulation No
    D.3.7Routes of administration for this IMPIntramuscular use
    D.3.11 The IMP contains an:
    D.3.11.1Active substance of chemical origin No
    D.3.11.2Active substance of biological/ biotechnological origin (other than Advanced Therapy IMP (ATIMP) Yes
    The IMP is a:
    D.3.11.3Advanced Therapy IMP (ATIMP) No
    D.3.11.3.1Somatic cell therapy medicinal product No
    D.3.11.3.2Gene therapy medical product No
    D.3.11.3.3Tissue Engineered Product No
    D.3.11.3.4Combination ATIMP (i.e. one involving a medical device) No
    D.3.11.3.5Committee on Advanced therapies (CAT) has issued a classification for this product No
    D.3.11.4Combination product that includes a device, but does not involve an Advanced Therapy No
    D.3.11.5Radiopharmaceutical medicinal product No
    D.3.11.6Immunological medicinal product (such as vaccine, allergen, immune serum) Yes
    D.3.11.7Plasma derived medicinal product No
    D.3.11.8Extractive medicinal product No
    D.3.11.9Recombinant medicinal product No
    D.3.11.10Medicinal product containing genetically modified organisms No
    D.3.11.11Herbal medicinal product No
    D.3.11.12Homeopathic medicinal product No
    D.3.11.13Another type of medicinal product No
    D.IMP: 4
    D.1.2 and D.1.3IMP RoleTest
    D.2 Status of the IMP to be used in the clinical trial
    D.2.1IMP to be used in the trial has a marketing authorisation Yes
    D.2.5The IMP has been designated in this indication as an orphan drug in the Community No
    D.2.5.1Orphan drug designation number
    D.3 Description of the IMP
    D.3.1Product namemRNA-1273.261
    D.3.2Product code mRNA-1273.261
    D.3.4Pharmaceutical form Injection
    D.3.4.1Specific paediatric formulation No
    D.3.7Routes of administration for this IMPIntramuscular use
    D.3.11 The IMP contains an:
    D.3.11.1Active substance of chemical origin No
    D.3.11.2Active substance of biological/ biotechnological origin (other than Advanced Therapy IMP (ATIMP) Yes
    The IMP is a:
    D.3.11.3Advanced Therapy IMP (ATIMP) No
    D.3.11.3.1Somatic cell therapy medicinal product No
    D.3.11.3.2Gene therapy medical product No
    D.3.11.3.3Tissue Engineered Product No
    D.3.11.3.4Combination ATIMP (i.e. one involving a medical device) No
    D.3.11.3.5Committee on Advanced therapies (CAT) has issued a classification for this product No
    D.3.11.4Combination product that includes a device, but does not involve an Advanced Therapy No
    D.3.11.5Radiopharmaceutical medicinal product No
    D.3.11.6Immunological medicinal product (such as vaccine, allergen, immune serum) Yes
    D.3.11.7Plasma derived medicinal product No
    D.3.11.8Extractive medicinal product No
    D.3.11.9Recombinant medicinal product No
    D.3.11.10Medicinal product containing genetically modified organisms No
    D.3.11.11Herbal medicinal product No
    D.3.11.12Homeopathic medicinal product No
    D.3.11.13Another type of medicinal product No
    D.8 Information on Placebo
    E. General Information on the Trial
    E.1 Medical condition or disease under investigation
    E.1.1Medical condition(s) being investigated
    Coronavirus Disease 2019 (COVID-19)
    E.1.1.1Medical condition in easily understood language
    COVID-19
    E.1.1.2Therapeutic area Diseases [C] - Virus Diseases [C02]
    MedDRA Classification
    E.1.3Condition being studied is a rare disease No
    E.2 Objective of the trial
    E.2.1Main objective of the trial
    The main objective of this study is to investigate the immunogenicity and safety of mRNA COVID-19 variant-containing vaccine formulations against the vaccine-matched variants and newly emerged variants of SARS-CoV-2.
    E.2.2Secondary objectives of the trial
    - To evaluate the safety of the updated mRNA COVID-19 variant-containing vaccine

    - To compare the immune response elicited by the updated mRNA-1273.251 COVID-19 variant-containing vaccine against the vaccine matched variant virus, between participants aged ≥12 to <65 years and those aged ≥65 years

    - To evaluate the safety and reactogenicity of mRNA-1273.251

    - To evaluate the safety and reactogenicity of a single injection of mRNA-1273.251 (or 2 injections for vaccine-naïve participants aged ≥6 months to <24 months)

    - To evaluate the safety of a single injection of mRNA-1273.261
    E.2.3Trial contains a sub-study No
    E.3Principal inclusion criteria
    • mRNA-1273.167 and mRNA-1273.712: Previously vaccinated adults aged ≥18 years
    • mRNA-1273.251: Participants ≥65 years of age, ≥12 to <65 years of age, or ≥6 months to <12 years of age with at least 1 risk factor for severe outcomes from COVID-19
    • mRNA-1273.261: ≥65 years of age at the time of signing the informed consent or ≥18 to <65 years of age at the time of signing the informed consent with at least 1 risk factor for severe outcomes from COVID-19
    • Able to comply with study procedures based on the assessment of the Investigator
    • Female participants of childbearing potential may be enrolled in the study if the participant fulfills all the following criteria:
    - Has a negative pregnancy test at the Screening Visit and on the day of vaccination prior to vaccine dose being administered on Day 1
    - Has practiced adequate contraception or has abstained from all activities that could result in pregnancy for at least 28 days prior to the first dose
    - Has agreed to continue adequate contraception
    E.4Principal exclusion criteria
    • History of SARS-CoV-2 infection within 3 months prior to enrollment for mRNA-1273.167 and mRNA-1273.712 or within up to 6 months prior to enrollment for mRNA-1273.251 and mRNA-1273.261
    • Is acutely ill or febrile (temperature 38.0°Celsius/100.4°Fahrenheit) less than 72 hours prior to or at the Screening Visit or Day 1. Participants meeting this criterion may be rescheduled within the Screening window
    • History of a diagnosis or condition that, in the judgment of the Investigator, is clinically unstable, or may affect participant safety, assessment of study endpoints, assessment of immune response, or adherence to study procedures
    • History of anaphylaxis or severe hypersensitivity reaction requiring medical intervention after receipt of any mRNA vaccine or therapeutic or any components of an mRNA vaccine or therapeutic
    • Receipt of COVID-19 vaccine within 3 months prior to enrollment for mRNA-1273.167 and mRNA-1273.712 or within 6 months prior to enrollment for mRNA-1273.251 and mRNA-1273.261
    • Receipt of any licensed non-COVID-19 vaccine within 14 days (inactivated vaccine, pediatric) or 28 days before or planned receipt within 14 days (pediatric) or 28 days after the study intervention, except an influenza vaccine, which may be given at least 7 days before (pediatric) or 14 days before or after receipt of the study intervention
    • Receipt of systemic immunosuppressants or immune-modifying drugs for >14 days total (within 6 months prior to Screening for mRNA-1273.167 and mRNA-1273.712 or within 180 days prior to Screening for mRNA-1273.251 and mRNA-1273.261) or is anticipating the need for immunosuppressive treatment at any time during participation in the study
    • Receipt of systemic immunoglobulins, long-acting biological therapies that affect immune (pediatric) responses, or blood products (within 3 months prior to Screening for mRNA-1273.167 and mRNA-1273.712 or within 90 days prior to the Screening for mRNA-1273.251 and mRNA-1273.261) or plans for receipt during the study
    • Has donated ≥450 millilitres of blood products within 28 days prior to the Screening Visit or plans to donate blood products during the study
    E.5 End points
    E.5.1Primary end point(s)
    - mRNA-1273.167, mRNA-1273.712, mRNA-1273.251, and mRNA-1273.261: Geometric Mean Value of Neutralizing Antibody Against COVID-19 Variants

    - mRNA-1273.167, mRNA-1273.712, mRNA-1273.251, and mRNA-1273.261: Geometric Mean Fold Rise of Neutralizing Antibody Against COVID-19 Variants

    - mRNA-1273.251 and mRNA-1273.261: Seroresponse Rate
    E.5.1.1Timepoint(s) of evaluation of this end point
    - Up to Day 29

    - Up to 28 days after last dose of study intervention

    - Up to Day 29
    E.5.2Secondary end point(s)
    - mRNA-1273.251: Geometric Mean Titer of Neutralizing Antibody Against COVID-19 Variants of Participants ≥12 to <65 Years Old and ≥65 Years Old

    - mRNA-1273.167, mRNA-1273.712, mRNA-1273.251, and mRNA-1273.261: Number of Participants with Serious Adverse Events, Adverse Events (AEs) Leading to Study Withdrawal, and AEs of Special Interest

    - mRNA-1273.251: Number of Participants with Solicited Local and Systemic Adverse Reactions

    - mRNA-1273.251 and mRNA-1273.261: Number of Participants with Unsolicited AEs
    E.5.2.1Timepoint(s) of evaluation of this end point
    - Day 29

    - Day 1 through end of study (up to Day 209)

    - Day 1 through 7 days after last dose of study intervention

    - Day 1 through 28 days after last dose of study intervention
    E.6 and E.7 Scope of the trial
    E.6Scope of the trial
    E.6.1Diagnosis No
    E.6.2Prophylaxis Yes
    E.6.3Therapy No
    E.6.4Safety Yes
    E.6.5Efficacy Yes
    E.6.6Pharmacokinetic No
    E.6.7Pharmacodynamic No
    E.6.8Bioequivalence No
    E.6.9Dose response No
    E.6.10Pharmacogenetic No
    E.6.11Pharmacogenomic No
    E.6.12Pharmacoeconomic No
    E.6.13Others Yes
    E.6.13.1Other scope of the trial description
    Immunogenicity, Reactogenicity
    E.7Trial type and phase
    E.7.1Human pharmacology (Phase I) No
    E.7.1.1First administration to humans No
    E.7.1.2Bioequivalence study No
    E.7.1.3Other No
    E.7.1.3.1Other trial type description
    E.7.2Therapeutic exploratory (Phase II) No
    E.7.3Therapeutic confirmatory (Phase III) Yes
    E.7.4Therapeutic use (Phase IV) Yes
    E.8 Design of the trial
    E.8.1Controlled No
    E.8.1.1Randomised No
    E.8.1.2Open Yes
    E.8.1.3Single blind No
    E.8.1.4Double blind No
    E.8.1.5Parallel group No
    E.8.1.6Cross over No
    E.8.1.7Other Yes
    E.8.1.7.1Other trial design description
    Single Group Assignment
    E.8.2 Comparator of controlled trial
    E.8.2.1Other medicinal product(s) No
    E.8.2.2Placebo No
    E.8.2.3Other No
    E.8.2.4Number of treatment arms in the trial1
    E.8.3 Will this trial be conducted at a single site globally? No
    E.8.4 Will this trial be conducted at multiple sites globally? Yes
    E.8.6 Trial involving sites outside the EEA
    E.8.6.2Trial being conducted completely outside of the EEA Yes
    E.8.6.3Specify the countries outside of the EEA in which trial sites are planned
    United States
    E.8.7Trial has a data monitoring committee No
    E.8.8 Definition of the end of the trial and justification where it is not the last visit of the last subject undergoing the trial
    The end of trial is defined as the date when the last data are available for participants in the master protocol and the subprotocols.
    E.8.9 Initial estimate of the duration of the trial
    E.8.9.2In all countries concerned by the trial years2
    F. Population of Trial Subjects
    F.1 Age Range
    F.1.1Trial has subjects under 18 Yes
    F.1.1Number of subjects for this age range: 497
    F.1.1.1In Utero No
    F.1.1.2Preterm newborn infants (up to gestational age < 37 weeks) No
    F.1.1.3Newborns (0-27 days) No
    F.1.1.4Infants and toddlers (28 days-23 months) Yes
    F.1.1.4.1Number of subjects for this age range: 110
    F.1.1.5Children (2-11years) Yes
    F.1.1.5.1Number of subjects for this age range: 220
    F.1.1.6Adolescents (12-17 years) Yes
    F.1.1.6.1Number of subjects for this age range: 167
    F.1.2Adults (18-64 years) Yes
    F.1.2.1Number of subjects for this age range: 294
    F.1.3Elderly (>=65 years) Yes
    F.1.3.1Number of subjects for this age range: 453
    F.2 Gender
    F.2.1Female Yes
    F.2.2Male Yes
    F.3 Group of trial subjects
    F.3.1Healthy volunteers Yes
    F.3.2Patients No
    F.3.3Specific vulnerable populations Yes
    F.3.3.1Women of childbearing potential not using contraception No
    F.3.3.2Women of child-bearing potential using contraception Yes
    F.3.3.3Pregnant women No
    F.3.3.4Nursing women No
    F.3.3.5Emergency situation No
    F.3.3.6Subjects incapable of giving consent personally Yes
    F.3.3.6.1Details of subjects incapable of giving consent
    Participants between 6 months and 17 years old.
    F.3.3.7Others No
    F.4 Planned number of subjects to be included
    F.4.2 For a multinational trial
    F.4.2.2In the whole clinical trial 1244
    F.5 Plans for treatment or care after the subject has ended the participation in the trial (if it is different from the expected normal treatment of that condition)
    None
    G. Investigator Networks to be involved in the Trial
    H.4 Third Country in which the Trial was first authorised
    H.4.1Third Country in which the trial was first authorised: United States
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