Delayed Heterologous SARS-CoV-2 Vaccine Dosing (Boost) After Receipt of EUA Vaccines
Public ClinicalTrials.gov record NCT04889209. 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 1/2 Study of Delayed Heterologous SARS-CoV-2 Vaccine Dosing (Boost) After Receipt of EUA Vaccines
Study identification
- NCT ID
- NCT04889209
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Phase 1, Phase 2
- Lead sponsor
- National Institute of Allergy and Infectious Diseases (NIAID)
- NIH
- Enrollment
- 867 participants
Conditions and interventions
Conditions
Interventions
- Ad26.COV2.S Biological
- BNT162b2 Biological
- mRNA-1273 Biological
- mRNA-1273.211 Biological
- mRNA-1273.222 Biological
- SARS-CoV-2 rS/M1 Biological
Biological
Eligibility (public fields only)
- Age range
- 18 Years to 99 Years
- 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
- May 27, 2021
- Primary completion
- Jun 15, 2023
- Completion
- Jun 15, 2023
- Last update posted
- Apr 19, 2025
2021 – 2023
United States locations
- U.S. sites
- 10
- U.S. states
- 7
- U.S. cities
- 9
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| The Hope Clinic of Emory University | Decatur | Georgia | 30030-1705 | — |
| University of Maryland Baltimore - Institute of Human Virology | Baltimore | Maryland | 21201-1009 | — |
| NYU Langone Vaccine Center | New York | New York | 10016 | — |
| University of Rochester Medical Center - Vaccine Research Unit | Rochester | New York | 14642 | — |
| Cincinnati Children's Hospital Medical Center Vaccine Research Center | Cincinnati | Ohio | 45206-1613 | — |
| University of Pittsburgh - Medicine - Infectious Diseases | Pittsburgh | Pennsylvania | 15213-3205 | — |
| University of Texas Medical Branch | Galveston | Texas | 77555-0435 | — |
| Baylor College of Medicine | Houston | Texas | 77030-3411 | — |
| Kaiser Permanente Washington Health Research Institute | Seattle | Washington | 98101-1466 | — |
| The University of Washington - Virology Research Clinic | Seattle | Washington | 98104 | — |
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 NCT04889209, 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 Apr 19, 2025 · Synced Jul 23, 2026
Related: full search, browse by condition, browse by drug or therapy, browse by sponsor, browse by U.S. city.
Open the official record
The complete protocol, eligibility criteria, and contact information for NCT04889209 live on ClinicalTrials.gov.