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ClinicalTrials.gov public records Last synced May 22, 2026, 3:46 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Vaccination Refusal Clear all
Completed Not applicable Interventional Accepts healthy volunteers
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 13, 2025 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Results available
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 May 22, 2026, 3:46 AM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Covid19, Influenza, Pneumonia, Vaccine Refusal
Interventions
Full VEPMP Intervention, Partial VEPMP Intervention, Delayed VEPMP Intervention
Behavioral
Lead sponsor
Charles Drew University of Medicine and Science
Other
Eligibility
65 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Aug 18, 2022 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers
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 16, 2025 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Vaccination Hesitancy, Human Papillomavirus Vaccination, Vaccine Refusal
Interventions
Argument inoculation messages, Simple forewarning message
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
523 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 10, 2023 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Vaccine Hesitancy
Interventions
Video intervention along with educational hand out
Other
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 60 Years
Enrollment
155 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
2
States / cities
Franklin, Tennessee • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 2, 2015 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available
View directory record Official record
Conditions
COVID-19, Vaccine Refusal
Interventions
Text Message, Motivational Interviewing, Electronic Educational Message with Tailored Questions/Prompts
Behavioral
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years to 100 Years
Enrollment
312 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated May 21, 2024 · Synced May 22, 2026, 3:46 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Vaccine Hesitancy
Interventions
Multilevel Intervention
Behavioral
Lead sponsor
San Diego State University
Other
Eligibility
18 Years and older
Enrollment
238 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
2
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Jul 3, 2025 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available
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 10, 2025 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available
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 27, 2025 · Synced May 22, 2026, 3:46 AM EDT
Terminated Not applicable Interventional
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 16, 2023 · Synced May 22, 2026, 3:46 AM EDT
Completed No phase listed Observational Accepts healthy volunteers
View directory record Official record
Conditions
Vaccine Hesitancy, Vaccine Refusal
Interventions
web-based survey
Other
Lead sponsor
Children's Mercy Hospital Kansas City
Other
Eligibility
Not listed
Enrollment
1,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 26, 2011 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Vaccine Hesitancy, Climate Change
Interventions
Social diffusion intervention
Behavioral
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
18 Years and older
Enrollment
600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 23, 2024 · Synced May 22, 2026, 3:46 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers
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 8, 2024 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available
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 24, 2023 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Results available
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 11, 2024 · Synced May 22, 2026, 3:46 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Vaccine Hesitancy, COVID-19 Testing, Community Health Workers
Interventions
Community Health Worker led curriculum
Behavioral
Lead sponsor
Charles Drew University of Medicine and Science
Other
Eligibility
16 Years and older
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
2
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 1, 2023 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional
View directory record Official record
Conditions
Influenza, COVID-19, Vaccination Hesitancy
Interventions
Text message influenza vaccine reminders, Text message COVID-19 vaccine reminders, Text message influenza and COVID-19 vaccine reminders
Behavioral
Lead sponsor
Columbia University
Other
Eligibility
6 Months to 17 Years
Enrollment
66,147 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
4
States / cities
Itasca, Illinois • New York, New York • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 10, 2025 · Synced May 22, 2026, 3:46 AM EDT
Completed No phase listed Observational Accepts healthy volunteers
View directory record Official record
Conditions
Vaccine Hesitancy
Interventions
MOtivational interviewing Tool to Improve Vaccine AdherencE (MOTIVE)
Other
Lead sponsor
Cedarville University
Other
Eligibility
0 Years to 6 Years
Enrollment
4,191 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Springfield, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 8, 2020 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Results available
View directory record Official record
Conditions
COVID-19
Interventions
Standard implementation webinar and online training, Virtual facilitation
Behavioral
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 99 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 20, 2026 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
HPV Vaccination, Uptake Vaccination, Series Completion
Interventions
PREVENT
Behavioral
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
335 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Mar 19, 2026 · Synced May 22, 2026, 3:46 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers
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 17, 2022 · Synced May 22, 2026, 3:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers
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 20, 2022 · Synced May 22, 2026, 3:46 AM EDT
Terminated Not applicable Interventional Results available
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 12, 2023 · Synced May 22, 2026, 3:46 AM EDT