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ClinicalTrials.gov public records Last synced Oct 20, 2026, 11:25 PM EDT

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Showing 217–240 of 1,351 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Immunization Clear all
Completed Not applicable Interventional Results available

SCALE-UP Utah II: Community-Academic Partnership to Address COVID-19 Conversational Agent Study

NCT05533359
View directory record Official record
Conditions
COVID-19
Interventions
Text-Messaging (TM), Conversational Agent (CA), Patient Navigation (PN)
Behavioral
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
2,117 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jan 15, 2025 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Not applicable Interventional

Rule-Based High-Risk Flu

NCT07798882
View directory record Official record
Conditions
Influenza, Vaccination, Risk Reduction, Health Behavior, Health Promotion
Interventions
Risk reduction
Behavioral
Lead sponsor
Geisinger Clinic
Other
Eligibility
18 Years and older
Enrollment
51,218 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
Danville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 20, 2026, 11:25 PM EDT
Not listed No phase listed Observational

Immune Response Following COVID-19 Vaccination

NCT04736524
View directory record Official record
Conditions
IgM and IgG in Blood
Interventions
Rapid antibody test
Other
Lead sponsor
Texas Cardiac Arrhythmia Research Foundation
Other
Eligibility
16 Years to 85 Years
Enrollment
500 participants
Timeline
2021 – 2022
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Feb 3, 2021 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Not applicable Interventional

School Located Adolescent Vaccination Study

NCT01719679
View directory record Official record
Conditions
School Located Vaccine Program
Interventions
School Located Vaccine (SLV) Program
Behavioral
Lead sponsor
University of Colorado, Denver
Other
Eligibility
10 Years to 18 Years
Enrollment
2,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
2
States / cities
Aurora, Colorado • Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Jan 3, 2013 · Synced Oct 20, 2026, 11:25 PM 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 20, 2026, 11:25 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Assessing Choice in the Employer Setting (ACES) Study

NCT00808808
View directory record Official record
Conditions
Healthy
Interventions
Choice of TIV or FluMist with baseline advertisement, Choice of TIV or FluMist with enhanced advertisement and incentives, Control - Usual care offering TIV only with baseline advertisement
Biological · Other
Lead sponsor
MedImmune LLC
Industry
Eligibility
18 Years and older
Enrollment
4,411 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
47
States / cities
Chatsworth, California • Novato, California • Sacramento, California + 34 more
Source: ClinicalTrials.gov public record
Updated Nov 20, 2013 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Microneedle Patch Study in Healthy Infants/Young Children

NCT03207763
View directory record Official record
Conditions
Vaccination, Skin Absorption
Interventions
Microneedle Formulation 1, Microneedle Formulation 2
Device
Lead sponsor
Emory University
Other
Eligibility
6 Weeks to 24 Months
Enrollment
33 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 10, 2020 · Synced Oct 20, 2026, 11:25 PM 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 20, 2026, 11:25 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Motivational Interviewing and Vaccine Hesitancy in Children

NCT03934008
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 9, 2020 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Influenza Vaccination in the Emergency Department

NCT00822627
View directory record Official record
Conditions
Influenza
Interventions
Influenza Vaccination, Education and referral
Drug · Behavioral
Lead sponsor
University of Arizona
Other
Eligibility
6 Months and older
Enrollment
140 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Jan 14, 2009 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

PFAS Exposure and Immune Response to Vaccination in Adults

NCT06588530
View directory record Official record
Conditions
Innate Inflammatory Response, Vaccination, Diphtheria, Tetanus, Environmental Exposure, Vaccine, Antibodies, Adult, Immunity, Pollution; Exposure
Interventions
TENIVAC
Biological
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years to 89 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Paulsboro, New Jersey
Source: ClinicalTrials.gov public record
Updated Dec 30, 2025 · Synced Oct 20, 2026, 11:25 PM EDT
Recruiting Phase 3 Interventional Accepts healthy volunteers

Study to Learn About Safety, Tolerability, and Immune Response of a Catch-up Pneumococcal Vaccine in Children and Adolescents

NCT07660198
View directory record Official record
Conditions
Pneumococcal Disease
Interventions
PG4, 20-valent pneumococcal conjugate vaccine (20vPnC)
Biological
Lead sponsor
Pfizer
Industry
Eligibility
15 Months to 17 Years
Enrollment
1,200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
57
States / cities
Birmingham, Alabama • Guntersville, Alabama • Fair Oaks, California + 37 more
Source: ClinicalTrials.gov public record
Updated Aug 31, 2026 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Not applicable Interventional

School Influenza Vaccine vs Standard of Care With Nested Trial of 2 Parent Notification Intensities

NCT01224301
View directory record Official record
Conditions
Immunizations, Vaccination, Influenza, School Health
Interventions
School based flu vaccine: Low intensity, School based flu vaccine: High intensity
Behavioral
Lead sponsor
Monroe County Department of Public Health
Other
Eligibility
4 Years to 13 Years
Enrollment
25,366 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Apr 4, 2012 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

H3N2 M2SR in Pediatric Population

NCT03553940
View directory record Official record
Conditions
Influenza, Influenza Immunisation
Interventions
Influenza Virus Monovalent A/H3N2/Bris 10 M2SR Live Vaccine, Placebo, Quadrivalent MDCK Inactivated Influenza Vaccine
Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
9 Years to 17 Years
Enrollment
43 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Oct 21, 2021 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Study of the Safety and Immunogenicity of Reduced Doses of the US Yellow Fever Vaccine

NCT05374317
View directory record Official record
Conditions
Yellow Fever Vaccination Reaction
Interventions
Yellow Fever Vaccine
Biological
Lead sponsor
US Army Medical Research Institute of Infectious Diseases
Federal
Eligibility
18 Years to 50 Years
Enrollment
88 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Frederick, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 7, 2026 · Synced Oct 20, 2026, 11:25 PM EDT
Enrolling by invitation No phase listed Observational Accepts healthy volunteers

Measuring the Healthy Pediatric Inflammatory Response to Vaccination.

NCT04112355
View directory record Official record
Conditions
Healthy Controls
Interventions
Blood Collection
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
4 Months to 21 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2028
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 22, 2026 · Synced Oct 20, 2026, 11:25 PM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

Intradermal Influenza Vaccination

NCT06067555
View directory record Official record
Conditions
Vaccine Reaction
Interventions
MicronJet, Fluzone® Quadrivalent, Bacteriostatic Saline
Device · Biological · Other
Lead sponsor
Yale University
Other
Eligibility
18 Years to 40 Years
Enrollment
249 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Jun 19, 2025 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Not applicable Interventional

Centralized IIS-based Reminder/Recall to Increase Childhood Influenza Vaccination Rates_2nd Trial in Colorado

NCT03246100
View directory record Official record
Conditions
Reminder Systems, Influenza Vaccines
Interventions
Reminders
Behavioral
Lead sponsor
University of Colorado, Denver
Other
Eligibility
6 Months to 17 Years
Enrollment
25,531 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 24, 2019 · Synced Oct 20, 2026, 11:25 PM EDT
Terminated Phase 2 Interventional

Vaccination of Melanoma Patients With Total or CD25-depleted Peripheral Blood Mononuclear Cell (PBMC)

NCT00961376
View directory record Official record
Conditions
Melanoma
Interventions
PBMC re-infusion, CD25 depletion
Biological
Lead sponsor
Providence Health & Services
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Aug 28, 2018 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

FLUAD® vs. Fluzone® High-Dose Study

NCT03183908
View directory record Official record
Conditions
Pain, Quality of Life, Injection Site Reaction, Side Effect of Drug, Adverse Drug Event
Interventions
FLUAD®, Fluzone® High-Dose
Biological
Lead sponsor
Duke University
Other
Eligibility
65 Years and older
Enrollment
757 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
4
States / cities
Atlanta, Georgia • Boston, Massachusetts • Durham, North Carolina + 1 more
Source: ClinicalTrials.gov public record
Updated Mar 30, 2021 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Phase 1 Interventional

Phase I Safety Study of Anti-HIV Immune Serum Globulin (Human)

NCT00002036
View directory record Official record
Conditions
HIV Infections
Interventions
Anti-HIV Immune Serum Globulin (Human)
Drug
Lead sponsor
Abbott
Industry
Eligibility
18 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 20, 2009 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Phase 2 Interventional

Vaccine Therapy in Treating Patients With Metastatic Melanoma

NCT00019734
View directory record Official record
Conditions
Melanoma (Skin)
Interventions
aldesleukin, fowlpox virus vaccine vector, vaccinia-tyrosinase vaccine
Biological
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
16 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2003
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 20, 2013 · Synced Oct 20, 2026, 11:25 PM EDT
Completed No phase listed Observational

Observation of HIV-Infected Children Receiving Protease Inhibitor and Reverse Transcriptase Inhibitor

NCT00001826
View directory record Official record
Conditions
HIV Infection
Interventions
Not listed
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
Not listed
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2006
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 4, 2008 · Synced Oct 20, 2026, 11:25 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Antibody Persistence and Response to Re-vaccination With Either Menactra® or Menomune® 3 Years After Initial Vaccination

NCT01239043
View directory record Official record
Conditions
Meningitis, Meningococcal Meningitis, Meningococcal Infections
Interventions
Menomune®: A, C, Y, W 135 Meningococcal Polysaccharide, Menactra®: Meningococcal (A, C, Y and W 135) Polysaccharide Diphtheria Toxoid Conjugate
Biological
Lead sponsor
Sanofi
Industry
Eligibility
56 Years and older
Enrollment
139 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
6
States / cities
Scottsdale, Arizona • Bardstown, Kentucky • Albuquerque, New Mexico + 3 more
Source: ClinicalTrials.gov public record
Updated Jun 25, 2012 · Synced Oct 20, 2026, 11:25 PM EDT