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Showing 1–24 of 324 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Covid19 Vaccine Clear all
Active, not recruiting Phase 1 Interventional Accepts healthy volunteers

A Safety and Immunogenicity Trial of Boost-2867 Vaccine, Via Intranasal and Intramuscular Routes

NCT07221162
View directory record Official record
Conditions
COVID-19
Interventions
Aluminum Hydroxide Suspension, Boost-2867, CpG 7909, Sodium Chloride, 0.9%
Drug · Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 64 Years
Enrollment
140 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
8
States / cities
San Francisco, California • Baltimore, Maryland • St Louis, Missouri + 5 more
Source: ClinicalTrials.gov public record
Updated Jun 22, 2026 · Synced Sep 19, 2026, 10:15 PM EDT
Active, not recruiting Phase 1 Interventional Accepts healthy volunteers

Safety and Immunogenicity Trial of PepGNP-COVID19 Vaccine in Adults

NCT07183709
View directory record Official record
Conditions
COVID-19
Interventions
PepGNP-COVID19, Sterile Water for Injection
Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 64 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
3
States / cities
Birmingham, Alabama • Washington D.C., District of Columbia • Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated May 14, 2026 · Synced Sep 19, 2026, 10:15 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Engaging Church Health Ministries to Decrease Coronavirus Disease-19 Vaccine Hesitancy in Underserved Populations

NCT05541393
View directory record Official record
Conditions
COVID-19
Interventions
Active Intervention Group
Behavioral
Lead sponsor
Pennington Biomedical Research Center
Other
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Baton Rouge, Louisiana
Source: ClinicalTrials.gov public record
Updated Apr 26, 2023 · Synced Sep 19, 2026, 10:15 PM EDT
Not listed No phase listed Observational

Sustained Humoral and Cell-Mediated Immunogenicity of COVID-19 Vaccines in Patients With Inflammatory Bowel Disease

NCT05014555
View directory record Official record
Conditions
Inflammatory Bowel Diseases
Interventions
COVID-19 Vaccine
Biological
Lead sponsor
GI Alliance
Other
Eligibility
18 Years to 85 Years
Enrollment
400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
4
States / cities
Jacksonville, Florida • Baton Rouge, Louisiana • Southlake, Texas + 1 more
Source: ClinicalTrials.gov public record
Updated Jun 17, 2023 · Synced Sep 19, 2026, 10:15 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Phase 3 Adolescent Study for SARS-CoV-2 rS Variant Vaccines

NCT05973006
View directory record Official record
Conditions
COVID-19
Interventions
NVX-CoV2601 co-formulated Omicron XBB.1.5 SARS-CoV-2 rS vaccine, Prototype/XBB.1.5 Bivalent Vaccine (5 µg)
Biological
Lead sponsor
Novavax
Industry
Eligibility
11 Years to 18 Years
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
20
States / cities
Davie, Florida • Jacksonville, Florida • Miami, Florida + 17 more
Source: ClinicalTrials.gov public record
Updated Jul 14, 2025 · Synced Sep 19, 2026, 10:15 PM EDT
Not listed Phase 3 Interventional Accepts healthy volunteers

Platform Trial to Compare Homologous Boost of Authorized COVID-19 Vaccines and Heterologous Boost With UB-612 Vaccine

NCT05293665
View directory record Official record
Conditions
COVID-19 Vaccines
Interventions
UB-612, BNT162b2 vaccine, ChAdOx1-S vaccine, Sinopharm BIBP
Biological
Lead sponsor
Vaxxinity, Inc.
Industry
Eligibility
16 Years and older
Enrollment
944 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Brownsville, Texas
Source: ClinicalTrials.gov public record
Updated Oct 13, 2022 · Synced Sep 19, 2026, 10:15 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Safety, Tolerability, and Immunogenicity of a Combined Modified RNA Vaccine Candidate Against COVID-19 and Influenza.

NCT06178991
View directory record Official record
Conditions
Influenza, COVID-19
Interventions
Influenza and COVID-19 Combination A, Licensed influenza vaccine, COVID-19 Vaccine, Influenza and COVID-19 Combination B, Placebo, Investigational influenza vaccine
Biological
Lead sponsor
BioNTech SE
Industry
Eligibility
18 Years to 64 Years
Enrollment
8,795 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
106
States / cities
Athens, Alabama • Birmingham, Alabama • Mobile, Alabama + 76 more
Source: ClinicalTrials.gov public record
Updated Dec 3, 2025 · Synced Sep 19, 2026, 10:15 PM EDT
Not listed Phase 3 Interventional Accepts healthy volunteers

A Phase 3 Randomized Double Blind Efficacy and Safety Study of Oral Polio Vaccine and NA-831 for Covid-19

NCT04540185
View directory record Official record
Conditions
Covid19, SARS (Severe Acute Respiratory Syndrome), SARS-CoV Infection, SARS-CoV-2
Interventions
Biological: oral polio vaccine, Comparable Placebo, NA-831, Comparable Placebo of drug, Combination of oral polio vaccine and NA-831, Comparable Placebo of Oral Polio Vaccine and Placebo of drug
Biological · Drug · Combination Product
Lead sponsor
Biomed Industries, Inc.
Industry
Eligibility
18 Years and older
Enrollment
3,600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
8
States / cities
Los Angeles, California • Orange, California • Palo Alto, California + 4 more
Source: ClinicalTrials.gov public record
Updated Sep 8, 2020 · Synced Sep 19, 2026, 10:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of a Multilevel Intervention on Adult COVID-19 and Influenza Vaccination Rate

NCT06646406
View directory record Official record
Conditions
COVID-19 Immunisation, Influenza Vaccine
Interventions
Patient letter and clinician communication
Behavioral
Lead sponsor
Mayo Clinic
Other
Eligibility
19 Years and older
Enrollment
114,165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
2
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 4, 2025 · Synced Sep 19, 2026, 10:15 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Safety of Pediatric COVID-19 Vaccination

NCT05157191
View directory record Official record
Conditions
Pain, Injection Site Reaction, Adverse Drug Event
Interventions
Observational
Other
Lead sponsor
Duke University
Other
Eligibility
5 Years to 15 Years
Enrollment
299 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
5
States / cities
Oakland, California • Atlanta, Georgia • New York, New York + 2 more
Source: ClinicalTrials.gov public record
Updated Jun 30, 2026 · Synced Sep 19, 2026, 10:15 PM EDT
Completed No phase listed Observational

A Study to Compare mRNA-1273 Versus BNT162b2 COVID-19 Vaccines Among Immunocompromised Adults

NCT05366322
View directory record Official record
Conditions
SARS-CoV-2
Interventions
Not listed
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
124,879 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 8, 2022 · Synced Sep 19, 2026, 10:15 PM EDT
Completed Phase 4 Interventional Results available

Assessing Safety of Coronavirus Infection (COVID-19) Messenger RNA (mRNA) Vaccine Administration in the Setting of a Previous Adverse Reaction

NCT05212610
View directory record Official record
Conditions
COVID-19, Corona Virus Infection
Interventions
Pfizer-BioNTech mRNA COVID-19 vaccine, Moderna mRNA COVID-19 vaccine
Biological
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
137 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Mar 26, 2026 · Synced Sep 19, 2026, 10:15 PM EDT
Completed Not applicable Interventional Results available

Use of Construal Level Theory to Inform Messaging to Increase Vaccination Against COVID-19

NCT04871776
View directory record Official record
Conditions
Covid19, Vaccine Refusal
Interventions
Messaging informed by construal level theory, Usual Care
Behavioral
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Enrollment
3,671 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 15, 2024 · Synced Sep 19, 2026, 10:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

COVIDVaxStories: Randomized Trial to Reduce COVID-19 Vaccine Hesitancy in Populations of Color

NCT06297876
View directory record Official record
Conditions
Vaccine Hesitancy
Interventions
Storytelling, Learn More (Active Comparator)
Behavioral
Lead sponsor
University of Massachusetts, Worcester
Other
Eligibility
18 Years to 105 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 3, 2024 · Synced Sep 19, 2026, 10:15 PM EDT
Completed No phase listed Observational

Post COVID-19 Vaccination Analysis in Healthcare Worker Recipients

NCT04922944
View directory record Official record
Conditions
Covid19, Vaccine Reaction
Interventions
COVID-19 vaccine
Drug
Lead sponsor
Huntington Memorial Hospital
Other
Eligibility
Not listed
Enrollment
167 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Pasadena, California
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Sep 19, 2026, 10:15 PM EDT
Terminated No phase listed Observational

Use and Effectiveness of COVID-19 Vaccines Using State Vaccine Registries and Insurance Claims Data

NCT05876377
View directory record Official record
Conditions
SARS-CoV-2, COVID-19, Post-Acute COVID-19 Syndrome
Interventions
Pfizer-BioNTech COVID-19 mRNA vaccine
Biological
Lead sponsor
Pfizer
Industry
Eligibility
6 Months and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 14, 2026 · Synced Sep 19, 2026, 10:15 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Phase 3 Study to Evaluate the Safety, Tolerability, and Immunogenicity of Multiple Production Lots and Dose Levels of BNT162b2 RNA-Based COVID-19 Vaccines Against COVID-19 in Healthy Participants

NCT04713553
View directory record Official record
Conditions
SARS-CoV-2 Infection, COVID-19
Interventions
BNT162b2, BNT162b2.B.1.351
Biological
Lead sponsor
BioNTech SE
Industry
Eligibility
12 Years to 50 Years
Enrollment
1,574 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
17
States / cities
Oakland, California • Milford, Connecticut • Hialeah, Florida + 13 more
Source: ClinicalTrials.gov public record
Updated Dec 21, 2022 · Synced Sep 19, 2026, 10:15 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Universal Anti-Viral Vaccine for Healthy Elderly Adults

NCT04441047
View directory record Official record
Conditions
Virus Diseases, Pneumonia, COVID-19 Respiratory Infection, RSV Pneumonia, Influenza, Human, ARDS, Human
Interventions
AlloStim
Drug
Lead sponsor
Mirror Biologics, Inc.
Industry
Eligibility
65 Years and older
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
4
States / cities
Delray Beach, Florida • Miami, Florida • Tampa, Florida + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 13, 2025 · Synced Sep 19, 2026, 10:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Community-engaged Optimization of COVID-19 Rapid Evaluation And TEsting Experiences

NCT05894655
View directory record Official record
Conditions
COVID-19, COVID-19 Pandemic
Interventions
COVID-19 walk-up, on-site testing strategy, Community Health Worker (CHW) leading testing navigation and general preventive care reminders, No-cost self-testing kit vending machines
Behavioral
Lead sponsor
University of California, San Diego
Other
Eligibility
Not listed
Enrollment
6,527 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
San Ysidro, California
Source: ClinicalTrials.gov public record
Updated Nov 3, 2025 · Synced Sep 19, 2026, 10:15 PM EDT
Terminated Phase 3 Interventional Results available

Janssen Ad26.CoV2.S Vaccine Booster in Kidney Transplant Recipients

NCT05220397
View directory record Official record
Conditions
Kidney Transplant Recipient
Interventions
Janssen Ad26.CoV2.S Vaccine, Reduction in Immunosuppression Medication, Maintenance in Immunosuppression Medication
Biological · Other
Lead sponsor
Mark Stegall
Other
Eligibility
18 Years and older
Enrollment
468 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
3
States / cities
Phoenix, Arizona • Jacksonville, Florida • Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 14, 2025 · Synced Sep 19, 2026, 10:15 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

A Safety, Reactogenicity, and Immunogenicity Study of mRNA-1073 (COVID-19/Influenza) Vaccine in Adults 18 to 75 Years Old

NCT05375838
View directory record Official record
Conditions
SARS-CoV-2, Influenza
Interventions
mRNA-1073, mRNA-1010, mRNA-1273, Placebo
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years to 75 Years
Enrollment
550 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
14
States / cities
Hollywood, Florida • Peoria, Illinois • Sioux City, Iowa + 9 more
Source: ClinicalTrials.gov public record
Updated Feb 27, 2024 · Synced Sep 19, 2026, 10:15 PM EDT
Completed No phase listed Observational

Serologic Response to the SARS-CoV-2 (COVID-19) MRNA-1273 Vaccine in Select Subsets of Oncology Patients

NCT04854980
View directory record Official record
Conditions
Covid19, Cancer
Interventions
Blood Sample
Other
Lead sponsor
University of Rochester
Other
Eligibility
50 Years to 75 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Mar 29, 2025 · Synced Sep 19, 2026, 10:15 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Vaccine Hesitancy in Black/African Americans With Rheumatic Diseases

NCT05822219
View directory record Official record
Conditions
Rheumatic Diseases, COVID-19 Vaccine, COVID-19, SLE
Interventions
COVID-19 vaccine and booster training, and importance
Behavioral
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 85 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 28, 2026 · Synced Sep 19, 2026, 10:15 PM EDT