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ClinicalTrials.gov public records Last synced Oct 22, 2026, 1:33 AM EDT

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Showing 1–24 of 96 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Treatment Refusal Clear all
Completed Not applicable Interventional Accepts healthy volunteers Results available

CATCH-UP Vaccines: Engaged Approaches to Testing in Community/Healthcare Settings for the Underserved (COVID-19)

NCT05236270
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 22, 2024 · Synced Oct 22, 2026, 1:33 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 22, 2026, 1:33 AM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Increasing COVID-19, Influenza, and Pneumonia Vaccine Uptake

NCT04761692
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 19, 2022 · Synced Oct 22, 2026, 1:33 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Communication Strategies to Increase HPV Vaccinations

NCT06784960
View directory record Official record
Conditions
Papilloma Viral Infection, Vaccine Hesitancy, Communication
Interventions
HPV Message 1, HPV Message 2, HPV Message 3, Control Message, Provider Strong-Recommendation Toolkit
Behavioral
Lead sponsor
Abramson Cancer Center at Penn Medicine
Other
Eligibility
18 Years to 45 Years
Enrollment
9,002 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 24, 2026 · Synced Oct 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluating a Community-Led COVID-19 Testing Intervention to Address Mistrust - Study 1

NCT06650462
View directory record Official record
Conditions
COVID-19, Trust
Interventions
Community-led discussion
Behavioral
Lead sponsor
Old Dominion University
Other
Eligibility
18 Years and older
Enrollment
57 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 27, 2026 · Synced Oct 22, 2026, 1:33 AM 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 22, 2026, 1:33 AM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Advancing Vaccine Equity Through Understanding Vaccine Hesitancy, Barriers, and Trust

NCT05537714
View directory record Official record
Conditions
Vaccine Hesitancy, Structural Barriers, Vaccine Trust
Interventions
Qualitative interviews/focus groups
Behavioral
Lead sponsor
East Carolina University
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Greenville, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 28, 2023 · Synced Oct 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Individual vs. Group Community Reinforcement Training to Help Parents of Substance-using Treatment-refusing Youth

NCT01829789
View directory record Official record
Conditions
Substance Use Disorders, Treatment Refusal
Interventions
Group Community Reinforcement Training for Parents, Individual Community Reinforcement Training for Parents
Behavioral
Lead sponsor
Oregon Research Institute
Other
Eligibility
Not listed
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2016
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Sep 30, 2016 · Synced Oct 22, 2026, 1:33 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 12, 2025 · Synced Oct 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

PREVENT HPV-Related Cancers - BootCamp Translation

NCT06290206
View directory record Official record
Conditions
HPV Vaccination, Vaccine; Uptake, Vaccination; Series Completion
Interventions
PREVENT - BCT
Behavioral
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated May 18, 2025 · Synced Oct 22, 2026, 1:33 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 22, 2026, 1:33 AM EDT
Recruiting Not applicable Interventional

Physician Engagement in EMS Transport Refusal Rates

NCT07107737
View directory record Official record
Conditions
Refusal of Transport
Interventions
Physician Consultation, Standard of Care
Behavioral
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 1, 2026 · Synced Oct 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional

Improving Vaccine Counseling Skills Among Residents Using Educational Modules and Standardized Patient Encounters

NCT06074237
View directory record Official record
Conditions
Vaccine Refusal, Vaccine-Preventable Diseases, Physician-Patient Relations
Interventions
Immersive resident education, Standardized patient (SP) encounter
Other
Lead sponsor
Corewell Health East
Other
Eligibility
18 Years and older
Enrollment
112 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Royal Oak, Michigan
Source: ClinicalTrials.gov public record
Updated Jan 22, 2026 · Synced Oct 22, 2026, 1:33 AM EDT
Completed No phase listed Observational

Parental Perception of COVID-19 Vaccine in Technology Dependent Patients

NCT05084976
View directory record Official record
Conditions
Chronic Respiratory Failure, Tracheostomy Complication, Mechanical Ventilation Complication
Interventions
COVID 19 vaccine counseling
Behavioral
Lead sponsor
Northwell Health
Other
Eligibility
Up to 21 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Lake Success, New York
Source: ClinicalTrials.gov public record
Updated Jul 18, 2022 · Synced Oct 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional Results available

Improving COVID-19 Vaccine Uptake in Nursing Homes

NCT04732819
View directory record Official record
Conditions
COVID-19 Vaccines
Interventions
High touch multi-pronged behavioral intervention
Behavioral
Lead sponsor
Brown University
Other
Eligibility
Not listed
Enrollment
23,768 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
4
States / cities
Tampa, Florida • Sykesville, Maryland • Elkhorn, Nebraska + 1 more
Source: ClinicalTrials.gov public record
Updated Sep 5, 2021 · Synced Oct 22, 2026, 1:33 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 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Educational Intervention to Improve Vaccine Acceptance

NCT01385501
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 3, 2015 · Synced Oct 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Emails Promoting COVID-19 Vaccination Among Healthcare Workers

NCT04728594
View directory record Official record
Conditions
Vaccination Refusal, Communication
Interventions
Social Proof, Reframing, Scarcity Message
Behavioral
Lead sponsor
Geisinger Clinic
Other
Eligibility
Not listed
Enrollment
9,566 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Danville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 26, 2021 · Synced Oct 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional Results available

Culturally Aware AET Non-Initiation Intervention

NCT05465408
View directory record Official record
Conditions
Breast Cancer, Survivorship, Treatment Compliance, Treatment Adherence, Treatment Refusal
Interventions
Culturally Aware Adjuvant Endocrine Therapy (AET) Non-Initiation Intervention
Behavioral
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older · Female only
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
11
States / cities
Boston, Massachusetts • Brighton, Massachusetts • Concord, Massachusetts + 7 more
Source: ClinicalTrials.gov public record
Updated Feb 24, 2026 · Synced Oct 22, 2026, 1:33 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Project 2VIDA! COVID-19 Vaccine Intervention Delivery for Adults in Southern California

NCT05022472
View directory record Official record
Conditions
Vaccine Refusal, Covid19
Interventions
COVID-19 Individual Awareness and Education., COVID-19 Community Outreach & Health Promotion., COVID-19 Individual Health Education & Linkages to Medical and Supportive Services., Pop-up community vaccination sites
Behavioral · Biological
Lead sponsor
Britt Skaathun
Other
Eligibility
16 Years to 99 Years
Enrollment
1,051 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
6
States / cities
Chula Vista, California • San Diego, California • San Ysidro, California
Source: ClinicalTrials.gov public record
Updated Jun 6, 2025 · Synced Oct 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Improving Vaccinations for Young Children (IVY)

NCT04203277
View directory record Official record
Conditions
Vaccination Refusal
Interventions
IVY
Other
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
Not listed
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 24, 2026 · Synced Oct 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

COVID-19 Vaccine Uptake Trial

NCT05419232
View directory record Official record
Conditions
Vaccination Refusal, COVID-19
Interventions
Short Message Service (SMS) + Website Link Strategy, Phone Call with Peer Strategy
Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
Not listed
Enrollment
262 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
8
States / cities
Hazelwood, Missouri • Jennings, Missouri • Saint Ann, Missouri + 2 more
Source: ClinicalTrials.gov public record
Updated Jul 21, 2026 · Synced Oct 22, 2026, 1:33 AM 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 22, 2026, 1:33 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Testing the Persuasiveness of Pro-inoculation Arguments

NCT05804825
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 11, 2023 · Synced Oct 22, 2026, 1:33 AM EDT