Study of a Quadrivalent High-Dose Influenza Vaccine and a Moderna COVID-19 Vaccine Administered Either Concomitantly or Singly in Participants 65 Years of Age and Older Previously Vaccinated With a 2-dose Schedule of Moderna COVID-19 Vaccine
Public ClinicalTrials.gov record NCT04969276. 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 II, Open-label Study to Assess the Safety and Immunogenicity of Fluzone® High-Dose Quadrivalent (Influenza Vaccine), 2021-2022 Formulation and a Third Dose of Moderna COVID-19 Vaccine (mRNA-1273 Vaccine) Administered Either Concomitantly or Singly in Adults 65 Years of Age and Older Previously Vaccinated With a 2-dose Schedule of Moderna COVID-19 Vaccine
Study identification
- NCT ID
- NCT04969276
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Phase 2
- Lead sponsor
- Sanofi Pasteur, a Sanofi Company
- Industry
- Enrollment
- 306 participants
Conditions and interventions
Conditions
Interventions
- COVID-19 mRNA Vaccine (nucleoside modified) Biological
- Quadrivalent Inactivated Influenza High Dose Biological
Biological
Eligibility (public fields only)
- Age range
- 65 Years and older
- Sex
- All
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Jul 15, 2021
- Primary completion
- Feb 7, 2022
- Completion
- Feb 7, 2022
- Last update posted
- Sep 11, 2025
2021 – 2022
United States locations
- U.S. sites
- 6
- U.S. states
- 5
- U.S. cities
- 6
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Investigational Site Number :8400003 | Glendale | Arizona | 85306 | — |
| Investigational Site Number :8400006 | San Diego | California | 92108 | — |
| Investigational Site Number :8400004 | Vista | California | 92083 | — |
| Investigational Site Number :8400005 | Centennial | Colorado | 80112 | — |
| Investigational Site Number :8400001 | Peoria | Illinois | 61614 | — |
| Investigational Site Number :8400002 | Austin | Texas | 78705 | — |
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 NCT04969276, 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 Sep 11, 2025 · Synced May 18, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT04969276 live on ClinicalTrials.gov.