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ClinicalTrials.gov public records Last synced Oct 18, 2026, 5:38 AM EDT

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Showing 1–9 of 9 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: mRNA-1647 Clear all
Active, not recruiting Phase 2 Interventional

A Study to Evaluate the Efficacy, Safety, and Immunogenicity of mRNA-1647 Cytomegalovirus (CMV) Vaccine in Allogenic Hematopoietic Cell Transplantation (HCT) Participants.

NCT05683457
View directory record Official record
Conditions
Cytomegalovirus Infection
Interventions
mRNA-1647, Placebo
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
84 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
3
States / cities
Boston, Massachusetts • St Louis, Missouri • Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 10, 2026 · Synced Oct 18, 2026, 5:38 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

A Study of mRNA-1647 Cytomegalovirus Vaccine in Healthy Participants 9 to 15 Years of Age and Participants 16 to 25 Years of Age

NCT05575492
View directory record Official record
Conditions
Cytomegalovirus
Interventions
mRNA-1647, Placebo
Biological · Other
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
9 Years to 25 Years
Enrollment
873 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
44
States / cities
La Mesa, California • Sacramento, California • Fort Collins, Colorado + 38 more
Source: ClinicalTrials.gov public record
Updated Jun 4, 2026 · Synced Oct 18, 2026, 5:38 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study of Modified mRNA Vaccines in Healthy Adults

NCT05397223
View directory record Official record
Conditions
SARS-CoV-2, Seasonal Influenza, Respiratory Syncytial Virus, Cytomegalovirus
Interventions
mRNA-1273, mRNA-1010, mRNA-1345, FLUAD®, mRNA-1647
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years to 75 Years
Enrollment
308 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
8
States / cities
Hollywood, Florida • Savannah, Georgia • Sioux City, Iowa + 4 more
Source: ClinicalTrials.gov public record
Updated Mar 12, 2026 · Synced Oct 18, 2026, 5:38 AM EDT
Completed Phase 2 Interventional

A Long-Term Extension Study to Evaluate the Immunogenicity and Safety of Cytomegalovirus (CMV) mRNA-1647 Vaccine

NCT04975893
View directory record Official record
Conditions
Cytomegalovirus Infection
Interventions
mRNA-1647, mRNA-1647
Biological · Other
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years to 40 Years
Enrollment
135 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
7
States / cities
Peoria, Illinois • Lenexa, Kansas • Lexington, Kentucky + 3 more
Source: ClinicalTrials.gov public record
Updated Feb 2, 2026 · Synced Oct 18, 2026, 5:38 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Evaluate the Safety, Reactogenicity, and Immunogenicity of Cytomegalovirus (CMV) Vaccine mRNA-1647

NCT05105048
View directory record Official record
Conditions
Cytomegalovirus Infection
Interventions
mRNA-1647, Placebo
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years to 40 Years
Enrollment
9 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
3
States / cities
North Hollywood, California • San Diego, California • Honolulu, Hawaii
Source: ClinicalTrials.gov public record
Updated Sep 11, 2023 · Synced Oct 18, 2026, 5:38 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Dose-Finding Trial to Evaluate the Safety and Immunogenicity of Cytomegalovirus (CMV) Vaccine mRNA-1647 in Healthy Adults

NCT04232280
View directory record Official record
Conditions
Cytomegalovirus Infection
Interventions
mRNA-1647, Placebo
Biological · Other
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years to 40 Years
Enrollment
315 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
9
States / cities
Sacramento, California • Peoria, Illinois • Lenexa, Kansas + 5 more
Source: ClinicalTrials.gov public record
Updated May 5, 2026 · Synced Oct 18, 2026, 5:38 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Safety, Reactogenicity, and Immunogenicity of Cytomegalovirus Vaccines mRNA-1647 and mRNA-1443 in Healthy Adults

NCT03382405
View directory record Official record
Conditions
Cytomegalovirus Infection
Interventions
mRNA-1647, mRNA-1443, Placebo
Biological · Other
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years to 49 Years
Enrollment
181 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
4
States / cities
Hollywood, Florida • Meridian, Idaho • Peoria, Illinois + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 15, 2021 · Synced Oct 18, 2026, 5:38 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Safety Study of Four Chimera Cytomegalovirus (CMV) Vaccines in Healthy Adult Males 30-50 Years of Age

NCT01195571
View directory record Official record
Conditions
Cytomegalovirus
Interventions
cmv vaccine
Biological
Lead sponsor
CMV Research Foundation
Other
Eligibility
30 Years to 50 Years · Male only
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2014
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated May 19, 2015 · Synced Oct 18, 2026, 5:38 AM EDT
Terminated Phase 3 Interventional Accepts healthy volunteers

A Study to Evaluate the Efficacy, Safety, and Immunogenicity of mRNA-1647 Cytomegalovirus (CMV) Vaccine in Healthy Participants 16 to 40 Years of Age

NCT05085366
View directory record Official record
Conditions
Cytomegalovirus Infection
Interventions
mRNA-1647, Placebo
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
16 Years to 40 Years · Female only
Enrollment
7,454 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
181
States / cities
Birmingham, Alabama • Dothan, Alabama • Guntersville, Alabama + 141 more
Source: ClinicalTrials.gov public record
Updated Dec 15, 2025 · Synced Oct 18, 2026, 5:38 AM EDT