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ClinicalTrials.gov public records Last synced Oct 17, 2026, 8:18 AM EDT

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Showing 1–24 of 36 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Standard Vaccine Message Clear all
Completed Not applicable Interventional Results available

Patient Portal Flu Vaccine Reminders_RCT 5 (LADHS)

NCT05535777
View directory record Official record
Conditions
Influenza, Respiratory Tract Infections
Interventions
Enhanced texts with Callback by a Person, Enhanced Bidirectional Texts
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
6 Months and older
Enrollment
246,295 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
2
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 11, 2025 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Increasing Human Papillomavirus (HPV) Vaccine Uptake Via General Health Messaging

NCT03759236
View directory record Official record
Conditions
Human Papilloma Virus
Interventions
Health Messaging via SMS, CDC Health Pamphlets
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
21 Years and older · Female only
Enrollment
3 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 1, 2025 · Synced Oct 17, 2026, 8:18 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Interpersonal Communication Training and Vaccination Workflow Training Alone and in Combination to Improve Communication and Recommendations About HPV Vaccination in Pharmacies, IMPACT HPV Trial

NCT06926062
View directory record Official record
Conditions
Human Papillomavirus-Related Carcinoma
Interventions
Best Practice, Educational Intervention, Interview, Questionnaire Administration, Training and Education, Vaccination
Other · Behavioral · Procedure
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
1,900 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
2
States / cities
University Park, Pennsylvania • Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 17, 2026 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Integrating Primary & Secondary Interventions for Cervical Cancer Prevention in Primary Care Settings

NCT03033550
View directory record Official record
Conditions
HPV-Related Carcinoma
Interventions
brief negotiated mobile application
Behavioral
Lead sponsor
Boston Medical Center
Other
Eligibility
9 Years to 17 Years · Female only
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 9, 2018 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

mHealth Intervention in Increasing HPV Vaccinations in College Students

NCT02960100
View directory record Official record
Conditions
Healthy Subject
Interventions
Informational Intervention, Media Intervention, Survey Administration
Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
18 Years to 25 Years
Enrollment
101 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 22, 2018 · Synced Oct 17, 2026, 8:18 AM EDT
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 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

A Chatbot Intervention for Reducing HPV Vaccine Hesitancy

NCT05959564
View directory record Official record
Conditions
Cervical Cancer, Anal Cancer, Penile Cancer
Interventions
Personalized Chatbot Intervention, Non-Personalized Chatbot Intervention, No Chatbot Control
Behavioral
Lead sponsor
University of Maryland, College Park
Other
Eligibility
18 Years and older
Enrollment
456 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
College Park, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 21, 2024 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vaccine Acceptance in Pregnant Minority Women

NCT01740310
View directory record Official record
Conditions
Pregnancy
Interventions
Maternal Vaccine Education
Behavioral
Lead sponsor
Emory University
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
121 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
4
States / cities
Atlanta, Georgia • Decatur, Georgia • Riverdale, Georgia
Source: ClinicalTrials.gov public record
Updated Mar 9, 2015 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Preventative Misconception Intervention

NCT01049139
View directory record Official record
Conditions
HIV, HIV Infections
Interventions
1-sided messages, 2-sided messages
Behavioral
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
16 Years to 19 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
4
States / cities
San Francisco, California • New Orleans, Louisiana • Baltimore, Maryland + 1 more
Source: ClinicalTrials.gov public record
Updated Mar 3, 2017 · Synced Oct 17, 2026, 8:18 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Group Intervention on Vaccine Confidence

NCT05891626
View directory record Official record
Conditions
Vaccination Refusal
Interventions
Group intervention
Behavioral
Lead sponsor
MultiCare Health System Research Institute
Other
Eligibility
18 Years and older
Enrollment
429 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Puyallup, Washington
Source: ClinicalTrials.gov public record
Updated Oct 10, 2023 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Conversations With AI Chatbots Increase Short-Term Vaccine Intentions But Do Not Outperform Standard Public Health Messaging

NCT07132125
View directory record Official record
Conditions
HPV Vaccination Intent
Interventions
Default-style LLM chatbot, Conversational-style LLM chatbot, Public health informational materials
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
930 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 20, 2025 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

HPV Vaccine Intervention for Young Sexual Minority Men

NCT04032106
View directory record Official record
Conditions
Healthy Subject
Interventions
Best Practice, Informational Intervention, Questionnaire Administration, Text Message-Based Intervention
Other · Behavioral
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
18 Years to 25 Years · Male only
Enrollment
1,227 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2022
U.S. locations
2
States / cities
Minneapolis, Minnesota • Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 14, 2025 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional

Centralized Reminder Recall - Flu RCT2

NCT03294473
View directory record Official record
Conditions
Influenza, Human, Orthomyxoviridae Infections, RNA Virus Infections, Virus Disease, Respiratory Tract Infections, Respiratory Tract Disease, Vaccines, Physiological Effects of Drugs
Interventions
R/R - Autodialers, R/R - Texting, R/R - mailed postcard
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
6 Months to 17 Years
Enrollment
70,190 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 5, 2019 · Synced Oct 17, 2026, 8:18 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Multilevel Intervention of COVID-19 Vaccine Uptake Among Latinos

NCT06156228
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 4, 2025 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Results available

COVID-19 Vaccine Text Outreach

NCT04834726
View directory record Official record
Conditions
Covid19
Interventions
Opt-In (Call-Back), Opt-in (In-Bound), Standard Message, Clinician Endorsement, Scarcity, Opt-Out Framing, Phone Call
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
16 Years and older
Enrollment
19,554 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 27, 2023 · Synced Oct 17, 2026, 8:18 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Digital Storytelling to Reduce Pediatric Influenza Vaccination Disparities

NCT06274359
View directory record Official record
Conditions
Influenza
Interventions
Digital storytelling
Behavioral
Lead sponsor
Denver Health and Hospital Authority
Other
Eligibility
18 Years to 90 Years
Enrollment
398 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
2
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Aug 28, 2026 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Results available

Behavioral Economics to Improve Flu Vaccination Using EHR Nudges Replication

NCT06626321
View directory record Official record
Conditions
Behavior, Health, Flu, Flu Vaccination
Interventions
Pre-visit patient text messaging, Default pended order, Monthly peer comparison feedback, High risk bidirectional pre-visit text messaging
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
50 Years and older
Enrollment
26,248 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Lancaster, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 30, 2026 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional

Personalized Nudging to Increase Influenza Vaccinations

NCT06566534
View directory record Official record
Conditions
Influenza, Human
Interventions
Reminder
Behavioral
Lead sponsor
Geisinger Clinic
Other
Eligibility
18 Years and older
Enrollment
77,482 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
1
States / cities
Danville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 16, 2025 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Results available

Patient Portal Flu Vaccine Reminders (RCT 6)

NCT06062264
View directory record Official record
Conditions
Influenza, Respiratory Tract Infections
Interventions
Portal-based Video Message, Portal-based Infographic Message
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
6 Months and older
Enrollment
22,233 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 20, 2025 · Synced Oct 17, 2026, 8:18 AM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Tailored Vaccine Messaging for Parents/Caregivers of Adolescents

NCT07878442
View directory record Official record
Conditions
Vaccine Confidence, Adolescent Vaccination, Vaccine Uptake
Interventions
Tailored Vaccine Messaging, Standard Vaccine Message
Behavioral
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
2,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Testing Multiple Behavioral Science Strategies to Increase Flu-Shot Rates at a Large Retail Pharmacy

NCT04590066
View directory record Official record
Conditions
Influenza, Human
Interventions
Flu shot text messages
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
734,383 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Innovative Tool to Increase Completion of Human Papillomavirus (HPV) Vaccine Series

NCT01343485
View directory record Official record
Conditions
GARDASIL Vaccination
Interventions
Computer reminder system
Behavioral
Lead sponsor
Planned Parenthood Federation of America
Other
Eligibility
19 Years to 26 Years · Female only
Enrollment
365 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
9
States / cities
Glendale, Arizona • Arvada, Colorado • Denver, Colorado + 6 more
Source: ClinicalTrials.gov public record
Updated Jun 26, 2018 · Synced Oct 17, 2026, 8:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Integrating a Health Information Technology System for Primary and Secondary Cervical Cancer Prevention

NCT03346915
View directory record Official record
Conditions
Human Papilloma Virus, Cervical Cancer, Human Papillomavirus Infection, Oropharyngeal Cancer, Vaginal Cancer, Vulvar Cancer, Anal Cancer, Penile Cancer
Interventions
WoW and BNI
Behavioral
Lead sponsor
Boston Medical Center
Other
Eligibility
9 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 9, 2019 · Synced Oct 17, 2026, 8:18 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Effectiveness of SMS (Short Message Service) Text Messaging in Increasing Adherence to Gardasil

NCT01276184
View directory record Official record
Conditions
HPV Vaccines
Interventions
SMS Text Message
Behavioral
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
12 Years to 26 Years · Female only
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2016
U.S. locations
2
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 14, 2021 · Synced Oct 17, 2026, 8:18 AM EDT