A Long-Term Extension Study to Evaluate the Immunogenicity and Safety of Cytomegalovirus (CMV) mRNA-1647 Vaccine
Public ClinicalTrials.gov record NCT04975893. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
A Phase 2, Non-Randomized, Long-Term Extension Study to Evaluate the Immunogenicity and Safety of Cytomegalovirus mRNA-1647 Vaccine Including a Booster Dose in a Subset of Participants Who Completed Study mRNA-1647-P202
Study identification
- NCT ID
- NCT04975893
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Phase 2
- Lead sponsor
- ModernaTX, Inc.
- Industry
- Enrollment
- 135 participants
Conditions and interventions
Conditions
Interventions
- mRNA-1647 Biological
- mRNA-1647 Other
Biological · Other
Eligibility (public fields only)
- Age range
- 18 Years to 40 Years
- Sex
- All
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Jun 17, 2021
- Primary completion
- Jan 18, 2026
- Completion
- Jan 18, 2026
- Last update posted
- Feb 1, 2026
2021 – 2026
United States locations
- U.S. sites
- 7
- U.S. states
- 5
- U.S. cities
- 6
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Optimal Research, LLC | Peoria | Illinois | 61610 | — |
| Johnson County Clin-Trials, Inc. | Lenexa | Kansas | 66219 | — |
| Alliance for Multispeciality Research, LLC | Lexington | Kentucky | 40509 | — |
| Tekton Research Inc | Austin | Texas | 78745 | — |
| Crossroads Clinical Research (Victoria) | Victoria | Texas | 77901 | — |
| J. Lewis Research, Inc. / Foothill Family Clinic South | Salt Lake City | Utah | 84109 | — |
| J. Lewis Research, Inc. / Foothill Family Clinic South | Salt Lake City | Utah | 84121 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT04975893, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Feb 1, 2026 · Synced Jul 21, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT04975893 live on ClinicalTrials.gov.