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ClinicalTrials.gov public records Last synced Oct 21, 2026, 2:35 AM EDT

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Showing 49–72 of 74 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Vaccine Refusal Clear all
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 21, 2026, 2:35 AM 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 4, 2025 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Addressing Vaccine Hesitancy and Increasing COVID-19 Vaccine Uptake Among African American Young Adults in the South

NCT05490329
View directory record Official record
Conditions
COVID-19, Vaccine Uptake
Interventions
Tough Talks COVID
Behavioral
Lead sponsor
Florida State University
Other
Eligibility
18 Years to 29 Years
Enrollment
360 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Mar 28, 2025 · Synced Oct 21, 2026, 2:35 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Feasibility Trial of a Multi-level Media Production and Social Marketing Campaign to Reduce HPV Vaccine Hesitancy

NCT05860725
View directory record Official record
Conditions
Human Papillomavirus Infection, Vaccination Hesitancy
Interventions
PSA Development, HPV vaccination focused social marketing campaign
Behavioral
Lead sponsor
University of Virginia
Other
Eligibility
18 Years and older
Enrollment
220 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated May 9, 2024 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

An Online Game to Help Canadian Adults Identify COVID-19 Vaccine Misinformation With One-Month Follow-Up

NCT07758296
View directory record Official record
Conditions
COVID-19, Vaccination Hesitancy, Health Misinformation, Communication
Interventions
Gamified misinformation refutation quiz, Refutational text blog post (active control)
Behavioral
Lead sponsor
University of South Carolina
Other
Eligibility
18 Years and older
Enrollment
4,071 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated Aug 11, 2026 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Improving Vaccine Acceptance Through EHR Integrated Patient- and Provider-Facing Decision Support

NCT06482450
View directory record Official record
Conditions
Vaccine Hesitancy, Vaccine Refusal
Interventions
LetsTalkShots (patient-facing CDS), LetsTalkShots (provider-facing CDS), Appointment Reminder Message
Other
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
Not listed
Enrollment
3,600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Sep 4, 2026 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Results available

Healthy, Immunized Communities Study

NCT03854734
View directory record Official record
Conditions
Vaccine Hesitancy, Communicable Diseases in Children
Interventions
Community Event, Educational Material
Behavioral
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
18 Years and older
Enrollment
148 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 12, 2024 · Synced Oct 21, 2026, 2:35 AM 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 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Mobile Health-based Motivational Interviewing to Promote COVID-19 Vaccination

NCT05977192
View directory record Official record
Conditions
Vaccination Hesitancy
Interventions
Standard MI, Intensive MI, MOTIVACC, Ecological momentary assessment (EMA) messages
Behavioral
Lead sponsor
Oklahoma State University
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
2
States / cities
Oklahoma City, Oklahoma • Stillwater, Oklahoma
Source: ClinicalTrials.gov public record
Updated Mar 21, 2025 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Results available

Precision Vaccine Promotion in Underserved Populations

NCT05537441
View directory record Official record
Conditions
Influenza, Vaccine Hesitancy
Interventions
Text messaging
Behavioral
Lead sponsor
University of Southern California
Other
Eligibility
6 Months and older
Enrollment
228,831 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Oct 1, 2024 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Results available

Development and Testing of ADEPT: A Parent Decision Support for Childhood Vaccinations

NCT04496453
View directory record Official record
Conditions
Vaccine Refusal
Interventions
Childhood vaccination decision support tool
Other
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 18, 2023 · Synced Oct 21, 2026, 2:35 AM EDT
Terminated Not applicable Interventional Results available

PROmotion of COvid-19 VA(X)Ccination in the Emergency Department - PROCOVAXED

NCT05142332
View directory record Official record
Conditions
Covid-19 Vaccine, Vaccine Hesitancy
Interventions
Covid-19 vaccine education materials
Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
541 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
7
States / cities
San Francisco, California • Durham, North Carolina • Philadelphia, Pennsylvania + 1 more
Source: ClinicalTrials.gov public record
Updated Dec 13, 2023 · Synced Oct 21, 2026, 2:35 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Motivational Interviewing for Vaccine Uptake in Latinx Adults

NCT06062056
View directory record Official record
Conditions
Vaccine Hesitancy
Interventions
EHR alert, Motivational Interviewing, Warm hand off to nurse
Other · Behavioral
Lead sponsor
Boston College
Other
Eligibility
18 Years and older
Enrollment
3,698 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 15, 2025 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Trusted Messengers: Intervention to Promote COVID-19 Vaccination

NCT04981392
View directory record Official record
Conditions
Covid19, Vaccination
Interventions
Primary care text message outreach to unvaccinated patients and resources to support PCPs
Behavioral
Lead sponsor
University of Massachusetts, Worcester
Other
Eligibility
18 Years and older
Enrollment
21,844 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 26, 2024 · Synced Oct 21, 2026, 2:35 AM 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 4, 2024 · Synced Oct 21, 2026, 2:35 AM 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 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Comparing Relative Strengths of Statistical Associations Between Psychological Traits and Vaccination-Related Outcomes I

NCT07172074
View directory record Official record
Conditions
Vaccination, Vaccination Hesitancy, Vaccination Promotion, Psychological Aspects
Interventions
General Psych Trait Measure, Vaccine-Specific Psych Trait Measures
Diagnostic Test · Other
Lead sponsor
University of Iowa
Other
Eligibility
18 Years and older
Enrollment
1,786 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Sep 16, 2025 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Improving Pediatric COVID-19 Vaccine Uptake Using an mHealth Tool

NCT05386355
View directory record Official record
Conditions
COVID-19 Vaccines, Telemedicine, Vaccine Hesitancy, Pediatric ALL
Interventions
COVID-19 Vaccine Uptake App, General Health App
Behavioral · Other
Lead sponsor
IDeA States Pediatric Clinical Trials Network
Network
Eligibility
18 Years and older
Enrollment
1,934 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
15
States / cities
Little Rock, Arkansas • Wilmington, Delaware • Honolulu, Hawaii + 12 more
Source: ClinicalTrials.gov public record
Updated Mar 11, 2025 · Synced Oct 21, 2026, 2:35 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 16, 2024 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

COVID-19 Messaging for Vaccination

NCT05182554
View directory record Official record
Conditions
Vaccination Refusal, COVID-19 Pandemic
Interventions
Doctor Videos, Sharing Videos, Sharing Videos (Influencers), Vaccine Ambassador, Video framing, Video order
Behavioral
Lead sponsor
Massachusetts Institute of Technology
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Cambridge, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 25, 2023 · Synced Oct 21, 2026, 2:35 AM EDT
Terminated Not applicable Interventional

Trusted Messenger Intervention

NCT05167422
View directory record Official record
Conditions
Vaccine Hesitancy
Interventions
Trusted Messenger
Behavioral
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Concord, New Hampshire
Source: ClinicalTrials.gov public record
Updated Jul 17, 2023 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

ACTIVATE in Public Housing

NCT06075732
View directory record Official record
Conditions
Pneumonia, Influenza, Varicella Zoster, Meningitis, COVID-19, Vaccine Hesitancy
Interventions
Increasing Willingness and Uptake of Influenza, Pneumonia, Meningitis, HZV, and COVID-19 Vaccination
Behavioral
Lead sponsor
Charles Drew University of Medicine and Science
Other
Eligibility
18 Years and older
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Feb 17, 2025 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Discussing COVID-19 Vaccines in Private Facebook Groups

NCT05422898
View directory record Official record
Conditions
COVID-19
Interventions
Gist messages on COVID-19 vaccination, COVID-19 vaccine information
Behavioral
Lead sponsor
George Washington University
Other
Eligibility
18 Years and older
Enrollment
508 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 Jun 21, 2022 · Synced Oct 21, 2026, 2:35 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

COVID-19 Booster Readiness Survey

NCT05529030
View directory record Official record
Conditions
Vaccination Refusal
Interventions
Salience of Omicron variant, Self-protection message, Other-protection message
Behavioral
Lead sponsor
Geisinger Clinic
Other
Eligibility
18 Years and older
Enrollment
12,036 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Danville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 30, 2022 · Synced Oct 21, 2026, 2:35 AM EDT