A Study to Investigate the Safety, Reactogenicity, and Immunogenicity of a Preventative Vaccine for Marburg Virus (mRNA-1519) in Healthy Adult Participants

October 30, 2026 updated by: ModernaTX, Inc.

A Phase 1, Observer-Blind, Placebo-Controlled, Dose-Ranging Study to Investigate the Safety, Reactogenicity, and Immunogenicity of a Preventative Vaccine for Marburg Virus (mRNA-1519) in Healthy Adult Participants 18 to 55 Years of Age

The main objective of this trial is to evaluate the safety, reactogenicity, and immunogenicity of mRNA-1519

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
64

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 55 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Key Inclusion Criteria:

  • In good general health or with stable chronic medical conditions, as determined by medical evaluation including medical history, physical examination, and laboratory tests.
  • Body mass index within the range 18 to 39 kg/m2 (inclusive).
  • Female participants of childbearing potential may be enrolled in the study if not pregnant or breastfeeding, subject to other criteria specified in the study protocol.

Key Exclusion Criteria:

  • 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.
  • History of participation in a prior filovirus (Ebola Zaire, Sudan, Bundibugyo, and Marburg) vaccine study.
  • History of confirmed or suspected filovirus infection.
  • Other conditions that in the Investigator's opinion could interfere with interpretation of study results or limit the participant's participation in the study.
  • Acutely ill or febrile (temperature ≥38.0℃ [100.4°F]) within 72 hours prior to or at the Screening Visit or Day 1.
  • Abnormal screening clinical laboratory values >Grade 1 for total white blood cell count, hemoglobin, alanine aminotransferase, aspartate aminotransferase, creatinine, alkaline phosphatase, total bilirubin, or platelets.
  • History of a diagnosis or condition that, in the judgment of the Investigator, is clinically unstable, potentially affects participant safety, the assessment of study endpoints, the assessment of immune response, or adherence to study procedures.

Note: Other inclusion and exclusion criteria may apply.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Sequential Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: mRNA-1519 Dose Level 1 Single Dose

Participants will receive 1 injection of mRNA-1519 at Dose Level 1 on Day 1
Biological: mRNA-1519

Sterile liquid for injection
Placebo Comparator: Placebo Matching Dose Level 1 Single Dose

Participants will receive 1 injection of Placebo matching Dose Level 1 on Day 1
Biological: Placebo

Sterile liquid for injection
Experimental: mRNA-1519 Dose Level 1 Two-Dose

Participants will receive 2 injections of mRNA-1519 at Dose Level 1, on Day 1 and Day 57
Biological: mRNA-1519

Sterile liquid for injection
Placebo Comparator: Placebo Matching Dose Level 1 Two-Dose

Participants will receive 2 injections of Placebo matching Dose Level 1, on Day 1 and Day 57
Biological: Placebo

Sterile liquid for injection
Experimental: mRNA-1519 Dose Level 2

Participants will receive 1 injection of mRNA-1519 at Dose Level 2 on Day 1
Biological: mRNA-1519

Sterile liquid for injection
Placebo Comparator: Placebo Matching Dose Level 2

Participants will receive 1 injection of Placebo matching Dose Level 2 on Day 1
Biological: Placebo

Sterile liquid for injection
Experimental: mRNA-1519 Dose Level 3

Participants will receive 1 injection of mRNA-1519 at Dose Level 3 on Day 1
Biological: mRNA-1519

Sterile liquid for injection
Placebo Comparator: Placebo Matching Dose Level 3

Participants will receive 1 injection of Placebo matching Dose Level 3 on Day 1
Biological: Placebo

Sterile liquid for injection

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
Number of Participants with Serious Adverse Events (SAEs), Any AEs Leading to Discontinuation From Study Participation and/or Study Vaccination, and AEs of Special Interest (AESIs)
Time Frame: Up to End of Study (EOS) (Day 337)
Up to End of Study (EOS) (Day 337)
Number of Participants with Solicited Local and Systemic Adverse Reactions (ARs)
Time Frame: Through 7 days after each study intervention
Through 7 days after each study intervention
Number of Participants with Unsolicited Adverse Events (AEs)
Time Frame: Through 28 days after each study intervention
Through 28 days after each study intervention
Number of Participants with Medically Attended Adverse Events (MAAEs)
Time Frame: From Day 1 to 6 months after the last study intervention
From Day 1 to 6 months after the last study intervention

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
Geometric Mean Titer of Marburg Virus (MARV)-Specific Binding Antibodies (bAbs)
Time Frame: At Day 29 (Single Dose), at Day 85 (Two-Dose), and Up to EOS (Day 337)
At Day 29 (Single Dose), at Day 85 (Two-Dose), and Up to EOS (Day 337)
Geometric Mean Titer of Marburg Virus (MARV)-Specific Neutralizing Antibodies (nAbs)
Time Frame: Throughout the study (Up to EOS/Day 337)
Throughout the study (Up to EOS/Day 337)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
ModernaTX, Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
November 2, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
April 14, 2028

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
April 14, 2028

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
October 30, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 30, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
November 5, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
November 5, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 30, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
October 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • mRNA-1519-P101

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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