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ClinicalTrials.gov public records Last synced Oct 9, 2026, 10:47 PM EDT

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Showing 97–120 of 180 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: COVID-19 Vaccination Clear all
Completed Not applicable Interventional Results available

COVID-19 Vaccination Take-Up

NCT04867174
View directory record Official record
Conditions
Covid19, Vaccination
Interventions
Financial incentives, Convenient scheduling link, Race concordant, Gender concordant
Behavioral
Lead sponsor
National Bureau of Economic Research, Inc.
Other
Eligibility
18 Years and older
Enrollment
2,701 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Martinez, California
Source: ClinicalTrials.gov public record
Updated Mar 28, 2024 · Synced Oct 9, 2026, 10:47 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Multicomponent Clinic-based Intervention to Promote COVID-19 Vaccine Intention and Uptake Among Diverse Youth and Adolescents

NCT05722652
View directory record Official record
Conditions
COVID-19 Vaccination
Interventions
CONFIDENCE
Behavioral
Lead sponsor
University of Massachusetts, Worcester
Other
Eligibility
18 Years and older
Enrollment
667 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 14, 2025 · Synced Oct 9, 2026, 10:47 PM EDT
Terminated Early Phase 1 Interventional

COVID-19 Vaccination in Rheumatic Disease Patients

NCT04839315
View directory record Official record
Conditions
Systemic Lupus Erythematosus, Sjogren's Syndrome, Inflammatory Myositis, Psoriatic Arthritis, Gout, Ankylosing Spondylitis, Arthritis of Multiple Sites Associated With Inflammatory Bowel Disease (Diagnosis), Osteoarthritis
Interventions
mRNA COVD19 vaccine
Biological
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
58 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 3, 2022 · Synced Oct 9, 2026, 10:47 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

COVID-19 Vaccine Messaging, Part 1

NCT04460703
View directory record Official record
Conditions
Vaccination, COVID-19
Interventions
Control message, Baseline message, Personal freedom message, Economic freedom message, Self-interest message, Community interest message, Economic benefit message, Guilt message, Embarrassment message, Anger message, Trust in science message, Not bravery message
Other
Lead sponsor
Yale University
Other
Eligibility
18 Years and older
Enrollment
4,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated May 5, 2022 · Synced Oct 9, 2026, 10:47 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Working Towards Empowered Community-driven Approaches to Increase Vaccination and Preventive Care Engagement

NCT05841810
View directory record Official record
Conditions
COVID-19
Interventions
mHealth Outreach, Care Coordination
Other
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older
Enrollment
398 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
4
States / cities
El Cajon, California • Escondido, California • La Jolla, California + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 15, 2025 · Synced Oct 9, 2026, 10:47 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Vaccine Responses to SARS-CoV-2 and Other Emerging Infectious Diseases

NCT05078905
View directory record Official record
Conditions
COVID-19, Vaccination, Healthy Volunteer
Interventions
Not listed
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
103 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2050
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 30, 2026 · Synced Oct 9, 2026, 10:47 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Testing a Personalized Normative Feedback Intervention for Vaccine Hesitancy

NCT05787015
View directory record Official record
Conditions
COVID-19, Vaccine Hesitancy
Interventions
Vaccine Norms Feedback, Alcohol Norms Feedback
Behavioral
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 24 Years
Enrollment
600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Mar 28, 2023 · Synced Oct 9, 2026, 10:47 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

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

NCT04969276
View directory record Official record
Conditions
Influenza Immunization, Healthy Volunteers
Interventions
Quadrivalent Inactivated Influenza High Dose, COVID-19 mRNA Vaccine (nucleoside modified)
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
65 Years and older
Enrollment
306 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
6
States / cities
Glendale, Arizona • San Diego, California • Vista, California + 3 more
Source: ClinicalTrials.gov public record
Updated Sep 12, 2025 · Synced Oct 9, 2026, 10:47 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Online Games to Help Canadian and U.S. Adults Identify COVID-19 and Vaccine Misinformation: Three Sequential Randomized Studies

NCT07758309
View directory record Official record
Conditions
COVID-19, Vaccine Hesitancy, Health Misinformation, Communication
Interventions
Gamified misinformation refutation quiz, Refutational text (active control)
Behavioral
Lead sponsor
University of South Carolina
Other
Eligibility
18 Years and older
Enrollment
3,637 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated Aug 11, 2026 · Synced Oct 9, 2026, 10:47 PM EDT
Completed No phase listed Observational Results available

The Impact of Vaccination on Severity of Illness in COVID-19

NCT04912700
View directory record Official record
Conditions
Covid19
Interventions
COVID-19 vaccine
Biological
Lead sponsor
Corewell Health East
Other
Eligibility
18 Years and older
Enrollment
11,834 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
Royal Oak, Michigan
Source: ClinicalTrials.gov public record
Updated Sep 30, 2021 · Synced Oct 9, 2026, 10:47 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Quantification of Binding and Neutralizing Antibody Levels in COVID-19 Vaccinated Health Care Workers Over 1 Year

NCT04910971
View directory record Official record
Conditions
COVID-19 Vaccine, Corona Virus Infection, Vaccine Adverse Reaction, Vaccine Response, Inflammation, Thrombosis
Interventions
Not listed
Lead sponsor
LifeBridge Health
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 2, 2021 · Synced Oct 9, 2026, 10:47 PM EDT
Completed Not applicable Interventional Results available

Effect of Varied Outreach Methods on Appointment Scheduling, Appointment Completion, and Receipt of COVID-19 Vaccination

NCT04904744
View directory record Official record
Conditions
Health Care Utilization, Vaccine Preventable Disease
Interventions
Low tailored message, No message, Low tailored message plus COVID-19 vaccine message
Other
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
12 Years to 17 Years
Enrollment
1,235 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 28, 2024 · Synced Oct 9, 2026, 10:47 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

The COVID-19 Back-to-Normal Study: Analysis of Multiple Outcomes

NCT04832932
View directory record Official record
Conditions
COVID-19 Vaccines
Interventions
COVID-19 vaccines
Biological
Lead sponsor
Mebo Research, Inc.
Other
Eligibility
18 Years and older
Enrollment
2,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
2
States / cities
Miami, Florida • Vonore, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 26, 2024 · Synced Oct 9, 2026, 10:47 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 5, 2025 · Synced Oct 9, 2026, 10:47 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Increasing Vaccine Uptake in Underresourced Public Housing Areas

NCT04779138
View directory record Official record
Conditions
Coronavirus, Vaccine Refusal
Interventions
Increasing Willingness and Uptake of COVID-19 Vaccination
Behavioral
Lead sponsor
Charles Drew University of Medicine and Science
Other
Eligibility
18 Years and older
Enrollment
462 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 24, 2024 · Synced Oct 9, 2026, 10:47 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Comparative Immunogenicity of Concomitant vs Sequential mRNA COVID-19 and Influenza Vaccinations

NCT06020118
View directory record Official record
Conditions
Influenza, COVID-19
Interventions
Simultaneous Vaccination (Influenza Vaccine and mRNA COVID booster), Sequential Vaccination (Influenza vaccine then mRNA COVID booster), Sequential Vaccination (mRNA COVID booster then Influenza vaccine)
Biological
Lead sponsor
Duke University
Other
Eligibility
6 Years to 64 Years
Enrollment
455 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
8
States / cities
Phoenix, Arizona • Tempe, Arizona • Atlanta, Georgia + 4 more
Source: ClinicalTrials.gov public record
Updated Jun 13, 2025 · Synced Oct 9, 2026, 10:47 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 Jul 1, 2026 · Synced Oct 9, 2026, 10:47 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Digital Applications to Monitor Novel Coronavirus Disease and Response in Colombia - Syndromic and Vaccination Surveillance

NCT05764174
View directory record Official record
Conditions
Vaccination Refusal, COVID-19
Interventions
Factual messages, Narrative message, Mixed message
Behavioral
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
18 Years and older
Enrollment
2,409 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 10, 2023 · Synced Oct 9, 2026, 10:47 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

COVID-19 Vaccine Hesitancy Among African Americans

NCT04801030
View directory record Official record
Conditions
Covid19, Vaccine Refusal, Communication
Interventions
YourCoViDVaxFacts
Behavioral
Lead sponsor
Meharry Medical College
Other
Eligibility
18 Years and older
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 18, 2022 · Synced Oct 9, 2026, 10:47 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Immunological Responses of COVID-19 Vaccination

NCT05238467
View directory record Official record
Conditions
Cancer; Chemotherapy
Interventions
COVID antibody titers in the blood
Other
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 21, 2023 · Synced Oct 9, 2026, 10:47 PM EDT
Not yet recruiting Phase 2 Interventional

Effect of Metabolic Modulation on a Post-acute COVID-19 Vaccination Syndrome (PACVS) Cohort

NCT06967428
View directory record Official record
Conditions
Vaccine Adverse Reaction, Post Acute Covid-19 Vaccination Syndrome
Interventions
Combined metabolic modulator, Rice Protein Powder with Vitamin C
Combination Product · Dietary Supplement
Lead sponsor
Independent Medical Alliance
Other
Eligibility
16 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 13, 2025 · Synced Oct 9, 2026, 10:47 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

COVID-19 Vaccine Education at the Point of Testing to Increase Vaccine Uptake in Vulnerable Communities in SE Louisiana

NCT04939506
View directory record Official record
Conditions
Covid19, Vaccine Refusal, Vaccine Hesitancy
Interventions
COVID-19 Vaccine Education at the Point of COVID-19 Testing
Behavioral
Lead sponsor
Xavier University of Louisiana.
Other
Eligibility
18 Years to 99 Years
Enrollment
377 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated Jul 21, 2026 · Synced Oct 9, 2026, 10:47 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Clinic-based HPV and COVID-19 Vaccine Promoting Intervention for AfAm Adolescents in Alabama

NCT04604743
View directory record Official record
Conditions
Vaccine Refusal
Interventions
Intervention, TBN
Behavioral
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
15 Years to 26 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Apr 6, 2023 · Synced Oct 9, 2026, 10:47 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Addressing COVID-19 Vaccine Hesitancy With Muliti-Level Interventions in Appalachia

NCT06505993
View directory record Official record
Conditions
COVID-19, Vaccine Hesitancy
Interventions
Health Communication, Health Communication + Structural
Behavioral
Lead sponsor
Marc Kiviniemi
Other
Eligibility
18 Years to 99 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Hazard, Kentucky
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Oct 9, 2026, 10:47 PM EDT