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Showing 1–24 of 319 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Covid19, Vaccines Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

A Study of an Investigational Flu Seasonal/SARS-CoV-2 Combination Vaccine in Adults

NCT06680375
View directory record Official record
Conditions
COVID-19
Interventions
Flu Seasonal /SARS-CoV-2 mRNA Dose 1, Flu Seasonal /SARS-CoV-2 mRNA Dose 2, Flu Seasonal mRNA, SARS-CoV-2 mRNA Dose 1, SARS-CoV-2 mRNA Dose 2, Licensed Flu Seasonal, Licensed COVID-19 mRNA, Placebo
Combination Product · Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 64 Years
Enrollment
106 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
9
States / cities
Anniston, Alabama • Rolling Hills Estates, California • Hialeah, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Sep 10, 2025 · Synced Jul 22, 2026, 10:22 AM EDT
Completed No phase listed Observational

Host Immune Response to Novel RNA COVID-19 Vaccination

NCT04784689
View directory record Official record
Conditions
COVID-19 Vaccine, Cancer
Interventions
COVID-19 Vaccine
Biological
Lead sponsor
The University of Texas Health Science Center at San Antonio
Other
Eligibility
18 Years and older
Enrollment
50 participants
Timeline
2021 – 2022
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated May 24, 2023 · Synced Jul 22, 2026, 10:22 AM EDT
Completed Not applicable Interventional Results available

Views on COVID-19 and Vaccination

NCT04706403
View directory record Official record
Conditions
Covid19
Interventions
Communication from a physician about the COVID-19 Vaccine
Behavioral
Lead sponsor
University of Massachusetts, Worcester
Other
Eligibility
18 Years and older
Enrollment
756 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 23, 2022 · Synced Jul 22, 2026, 10:22 AM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Safety, Reactogenicity, and Effectiveness of mRNA-1273 Vaccine in Adolescents 12 to <18 Years Old to Prevent COVID-19

NCT04649151
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273, Placebo, mRNA-1273.222
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
12 Years to 18 Years
Enrollment
4,328 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
48
States / cities
Banning, California • La Mesa, California • Lake Worth, Florida + 41 more
Source: ClinicalTrials.gov public record
Updated Sep 14, 2025 · Synced Jul 22, 2026, 10:22 AM EDT
Completed Early Phase 1 Interventional

Immune Response to the COVID-19 Vaccine

NCT04936997
View directory record Official record
Conditions
Covid19, Cancer, Malignancy, Vaccine Response Impaired
Interventions
SARS-COV2 Pfizer Vaccine
Biological
Lead sponsor
University of Arizona
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated May 19, 2022 · Synced Jul 22, 2026, 10:22 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

A Study of Ad26.COV2.S in Adults (COVID-19)

NCT04436276
View directory record Official record
Conditions
Covid-19 Prevention
Interventions
Ad26.COV2.S, Placebo
Biological
Lead sponsor
Janssen Vaccines & Prevention B.V.
Industry
Eligibility
18 Years and older
Enrollment
1,085 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
7
States / cities
San Diego, California • Melbourne, Florida • Peoria, Illinois + 4 more
Source: ClinicalTrials.gov public record
Updated Feb 3, 2025 · Synced Jul 22, 2026, 10:22 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Understanding Immunity to the Flu Vaccine in COVID-19 Patients

NCT04579588
View directory record Official record
Conditions
Corona Virus Infection, Flu Vaccine, Immunity
Interventions
Flu shot
Biological
Lead sponsor
Stanford University
Other
Eligibility
9 Years to 64 Years
Enrollment
230 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2028
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated Mar 17, 2026 · Synced Jul 22, 2026, 10:22 AM EDT
Active, not recruiting Not applicable Interventional

RADx-UP Phase 3D (Oregon Saludable: Juntos Podemos)

NCT05910879
View directory record Official record
Conditions
Health Behavior, Health Care Utilization, Vaccine Hesitancy
Interventions
Self-Affirmation Implementation Intentions (SAII) Intervention, Promotores de Salud (Health Education)
Behavioral
Lead sponsor
University of Oregon
Other
Eligibility
18 Years and older
Enrollment
600 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Dec 5, 2024 · Synced Jul 22, 2026, 10:22 AM 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 Jul 22, 2026, 10:22 AM 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 Jul 22, 2026, 10:22 AM EDT
Completed No phase listed Observational

Immunogenicity and Safety of Commercially Available Vaccines Against SARS-CoV-2 (COVID-19) in Patients With Hematologic Malignancies

NCT04748185
View directory record Official record
Conditions
Monoclonal B-Cell Lymphocytosis, Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma, B-cell Non Hodgkin Lymphoma, Hodgkin Lymphoma
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
358 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 9, 2023 · Synced Jul 22, 2026, 10:22 AM EDT
Completed No phase listed Observational

A Multicenter Study to Assess Response to COVID-19 Vaccine in Multiple Sclerosis Participants Treated With Ofatumumab

NCT04847596
View directory record Official record
Conditions
Relapsing Multiple Sclerosis
Interventions
Ofatumumab, Covid-19 vaccine
Other
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 55 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
4
States / cities
Phoenix, Arizona • Owosso, Michigan • St Louis, Missouri + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 24, 2023 · Synced Jul 22, 2026, 10:22 AM 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 Jul 22, 2026, 10:22 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate Safety and Immunogenicity of mRNA-1273 Vaccine to Prevent COVID-19 in Adult Organ Transplant Recipients and in Healthy Adult Participants

NCT04860297
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
234 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
15
States / cities
Mesa, Arizona • San Diego, California • New Haven, Connecticut + 12 more
Source: ClinicalTrials.gov public record
Updated Jun 17, 2024 · Synced Jul 22, 2026, 10:22 AM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

A Safety and Immunogenicity Trial of OCU500, ChAd36 Vector Encoding SARS-CoV-2 Spike Vaccine Via Intranasal and Inhalational Routes in Previously Vaccinated Adults

NCT07536308
View directory record Official record
Conditions
COVID-19
Interventions
OCU500
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 64 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
6
States / cities
Decatur, Georgia • Baltimore, Maryland • Boston, Massachusetts + 2 more
Source: ClinicalTrials.gov public record
Updated Jul 16, 2026 · Synced Jul 22, 2026, 10:22 AM EDT
Completed Phase 2Phase 3 Interventional

A Study to Evaluate the Safety and Immunogenicity of an (Omicron Subvariant) COVID-19 Vaccine Booster Dose in Previously Vaccinated Participants and Unvaccinated Participants.

NCT05975060
View directory record Official record
Conditions
COVID-19
Interventions
XBB.1.5 Vaccine (Booster), XBB.1.5 Vaccine (single dose)
Biological
Lead sponsor
Novavax
Industry
Eligibility
18 Years to 54 Years
Enrollment
660 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
30
States / cities
Mobile, Alabama • Sacramento, California • Colorado Springs, Colorado + 26 more
Source: ClinicalTrials.gov public record
Updated May 29, 2024 · Synced Jul 22, 2026, 10:22 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Connecting Friends and Health Workers to Boost COVID-19 Vaccination in Latino Communities

NCT06128928
View directory record Official record
Conditions
COVID-19, Vaccine
Interventions
REDES, Control
Behavioral
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Enrollment
900 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 11, 2025 · Synced Jul 22, 2026, 10:22 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Public Support for COVID-19 Test Allocation

NCT05185687
View directory record Official record
Conditions
Health Equity, COVID-19
Interventions
First Come, First Served, Random, Disadvantaged Priority & Random
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
2,019 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Jan 10, 2022 · Synced Jul 22, 2026, 10:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

COVID-19 Vaccines International Pregnancy Exposure Registry

NCT04705116
View directory record Official record
Conditions
Covid19
Interventions
COVID-19 vaccine
Biological
Lead sponsor
Pregistry
Industry
Eligibility
18 Years to 50 Years · Female only
Enrollment
1,184 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jul 16, 2026 · Synced Jul 22, 2026, 10:22 AM EDT
Not listed Phase 2Phase 3 Interventional Accepts healthy volunteers

PROSPECTIVE OPEN LABEL CLINICAL TRIAL TO ADMINISTER A BOOSTER DOSE OF PFIZER/BIONTECH OR MODERNA COVID-19 VACCINE IN HIGH-RISK INDIVIDUALS

NCT05279365
View directory record Official record
Conditions
SARS CoV 2 Infection, COVID-19
Interventions
Pfizer/BioNTech (BNT162b2), Moderna
Biological
Lead sponsor
DHR Health Institute for Research and Development
Other
Eligibility
18 Years and older
Enrollment
1,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
4
States / cities
Brownsville, Texas • Edinburg, Texas • Rio Grande City, Texas
Source: ClinicalTrials.gov public record
Updated Mar 28, 2022 · Synced Jul 22, 2026, 10:22 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Text-based Interventions to Promote COVID-19 Vaccinations

NCT04800965
View directory record Official record
Conditions
Covid19, Vaccines
Interventions
Patient MyChart Scheduling Link, Patient Educational Video, Enhanced Follow through Message
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
200,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Westwood, Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Sep 12, 2022 · Synced Jul 22, 2026, 10:22 AM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Project REMOTE (REimagining Measurements and Operations of Translational Endpoints)

NCT06776367
View directory record Official record
Conditions
COVID-19
Interventions
Remote study participation and self-collection of specimens, Traditional clinical trial participation with clinician-collected specimens
Other
Lead sponsor
Biomedical Advanced Research and Development Authority
Federal
Eligibility
18 Years and older
Enrollment
4,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
16
States / cities
Vestavia Hills, Alabama • Mesa, Arizona • Fair Oaks, California + 12 more
Source: ClinicalTrials.gov public record
Updated Sep 16, 2025 · Synced Jul 22, 2026, 10:22 AM EDT
Not listed No phase listed Observational

National Vaccine Adverse Event Reporting Survey and Etiology

NCT05095844
View directory record Official record
Conditions
COVID-19, Vaccine Adverse Reaction, Vaccine Reaction, Vaccine or Biological Substance, Unspecified Causing Adverse Effects in Therapeutic Use, Corona Virus Infection, Blood Clot, Thrombocytopenia, Neuritis, Vasculitis, Influenza, Guillain-Barré, GWAS, Genetic Sequencing
Interventions
vaccinated
Biological
Lead sponsor
Neuroganics LLC
Industry
Eligibility
5 Years to 99 Years
Enrollment
100,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Northglenn, Colorado
Source: ClinicalTrials.gov public record
Updated Mar 17, 2022 · Synced Jul 22, 2026, 10:22 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

A Phase 2 Trial of the Immunogenicity and Safety of CVXGA Intranasal COVID Vaccine in Healthy Adults

NCT05736835
View directory record Official record
Conditions
COVID-19
Interventions
CVXGA
Biological
Lead sponsor
CyanVac LLC
Industry
Eligibility
18 Years to 80 Years
Enrollment
227 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
10
States / cities
San Diego, California • Boise, Idaho • Sioux City, Iowa + 7 more
Source: ClinicalTrials.gov public record
Updated Jul 13, 2026 · Synced Jul 22, 2026, 10:22 AM EDT