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ClinicalTrials.gov public records Last synced Sep 6, 2026, 10:37 PM EDT

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Showing 1–24 of 82 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Placebo booster Clear all
Completed Phase 2 Interventional Accepts healthy volunteers Results available

A Study to Evaluate Safety and Immunogenicity of One or Two Booster Vaccinations With H5N6 Influenza Vaccine in Adults Primed With H5N1 Influenza Vaccine or Unprimed

NCT05422326
View directory record Official record
Conditions
Influenza, Human, Influenza in Birds, Respiratory Tract Infections, Infections, Orthomyxoviridae Infections, RNA Virus Infections, Virus Diseases, Respiratory Tract Diseases
Interventions
aH5N6c on Day 1, aH5N6c on Day 22, Placebo on Day 22
Biological
Lead sponsor
Seqirus
Industry
Eligibility
18 Years and older
Enrollment
260 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
18
States / cities
Huntsville, Alabama • Tempe, Arizona • San Diego, California + 14 more
Source: ClinicalTrials.gov public record
Updated May 12, 2026 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Safety and Immunogenicity of Various Formulations of Live Attenuated Tetravalent Dengue Vaccine in Healthy US Adults

NCT00350337
View directory record Official record
Conditions
Dengue
Interventions
Pre-transfection F17, Post-transfection F17, Post-transfection F19, Placebo
Biological · Other
Lead sponsor
U.S. Army Medical Research and Development Command
Federal
Eligibility
18 Years to 45 Years
Enrollment
86 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
1
States / cities
Silver Spring, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 11, 2021 · Synced Sep 6, 2026, 10:37 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

A Trial Evaluating the Safety and Effects of an RNA Vaccine ARCT-021 in Healthy Adults

NCT04668339
View directory record Official record
Conditions
Covid19, SARS-CoV Infection, Corona Virus Infection
Interventions
ARCT-021 single dose priming, ARCT-021 two lower dose priming, ARCT-021 two higher dose priming, Placebo (two doses), priming, Randomized booster, Placebo booster
Biological
Lead sponsor
Arcturus Therapeutics, Inc.
Industry
Eligibility
18 Years and older
Enrollment
581 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
12
States / cities
Chandler, Arizona • Tucson, Arizona • San Diego, California + 9 more
Source: ClinicalTrials.gov public record
Updated May 14, 2025 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Study to Describe the Safety, Tolerability, Immunogenicity, and Efficacy of RNA Vaccine Candidates Against COVID-19 in Healthy Individuals

NCT04368728
View directory record Official record
Conditions
SARS-CoV-2 Infection, COVID-19
Interventions
BNT162b1, BNT162b2, Placebo, BNT162b2SA
Biological · Other
Lead sponsor
BioNTech SE
Industry
Eligibility
12 Years and older
Enrollment
46,969 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
154
States / cities
Athens, Alabama • Birmingham, Alabama • Huntsville, Alabama + 106 more
Source: ClinicalTrials.gov public record
Updated Mar 24, 2026 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Study of a Respiratory Syncytial Virus/Human Metapneumovirus Vaccine Candidate

NCT06134648
View directory record Official record
Conditions
Respiratory Syncytial Virus Infection, Healthy Volunteers, Human Metapneumovirus
Interventions
RSV/hMPV vaccine candidate Dose L, RSV/hMPV vaccine candidate Dose A, RSV/hMPV vaccine candidate Dose B, Placebo
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
60 Years and older
Enrollment
646 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
10
States / cities
Los Alamitos, California • Los Angeles, California • Rolling Hills Estates, California + 7 more
Source: ClinicalTrials.gov public record
Updated Mar 11, 2026 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study of 2-dose Vaccine Regimen Using 3 Consecutive Lots of Ad26.ZEBOV and MVA-BN-Filo in Adult Participants

NCT04228783
View directory record Official record
Conditions
Ebola
Interventions
Ad26.ZEBOV, MVA-BN-Filo, Placebo
Biological
Lead sponsor
Janssen Vaccines & Prevention B.V.
Industry
Eligibility
18 Years to 50 Years
Enrollment
974 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
7
States / cities
Mobile, Alabama • Tempe, Arizona • Lexington, Kentucky + 4 more
Source: ClinicalTrials.gov public record
Updated May 24, 2025 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Evaluating the Safety of and Immune Response to an HIV Vaccine Followed by Booster, Administered by Two Devices, in HIV-Uninfected Adults

NCT01260727
View directory record Official record
Conditions
HIV Infections
Interventions
PENNVAX-G DNA Vaccine, MVA-CMDR Vaccine, Placebo PENNVAX-G Vaccine, Placebo MVA-CMDR Vaccine
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 49 Years
Enrollment
92 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
Rockville, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 31, 2021 · Synced Sep 6, 2026, 10:37 PM EDT
Terminated Phase 2 Interventional

Phase II Study of Treatment for HPV16+ ASC-US, ASC-H and LSIL

NCT03911076
View directory record Official record
Conditions
ASC-US, ASC-H, LSIL
Interventions
PVX-2, Placebo
Biological · Other
Lead sponsor
PapiVax Biotech, Inc.
Other
Eligibility
25 Years to 70 Years · Female only
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
6
States / cities
Port Saint Lucie, Florida • Newark, New Jersey • Fairfield, Ohio + 3 more
Source: ClinicalTrials.gov public record
Updated Jun 16, 2024 · Synced Sep 6, 2026, 10:37 PM EDT
Active, not recruiting Phase 3 Interventional Accepts healthy volunteers

Long-term Follow-up Study to Evaluate Safety and Immunogenicity of CHIKV VLP Single or Booster Vaccination

NCT06007183
View directory record Official record
Conditions
Chikungunya Virus Infection
Interventions
CHIKV VLP vaccine booster, Placebo booster
Biological
Lead sponsor
Bavarian Nordic
Industry
Eligibility
12 Years and older
Enrollment
715 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2028
U.S. locations
24
States / cities
Mobile, Alabama • Tempe, Arizona • Melbourne, Florida + 20 more
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 4 Interventional Results available

Treatment of Severe Childhood Aggression (The TOSCA Study)

NCT00796302
View directory record Official record
Conditions
Attention Deficit Disorder With Hyperactivity
Interventions
Methylphenidate HCl, Risperidone, Parent Management Training (PMT), Placebo
Drug · Behavioral
Lead sponsor
Michael Aman
Other
Eligibility
6 Years to 12 Years
Enrollment
168 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
4
States / cities
Stony Brook, New York • Cleveland, Ohio • Columbus, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 25, 2017 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 2 Interventional Results available

Study of High-dose Influenza Vaccine Efficacy by Repeated Dosing IN Gammopathy Patients

NCT02566265
View directory record Official record
Conditions
Influenza, Multiple Myeloma, Waldenstrom's Macroglobulinemia, Plasma Cell Disorders, MGUS
Interventions
Fluzone High Dose Vaccine, Standard of care/Placebo
Biological
Lead sponsor
Yale University
Other
Eligibility
18 Years to 90 Years
Enrollment
122 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Jan 29, 2019 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Safety, Reactogenicity, and Effectiveness of mRNA-1273 Vaccine in Adolescents 12 to <18 Years Old to Prevent COVID-19

NCT04649151
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273, Placebo, mRNA-1273.222
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
12 Years to 18 Years
Enrollment
4,328 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
48
States / cities
Banning, California • La Mesa, California • Lake Worth, Florida + 41 more
Source: ClinicalTrials.gov public record
Updated Sep 14, 2025 · Synced Sep 6, 2026, 10:37 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers

Th1 Response to Influenza: Aging and Vaccine Efficacy

NCT00396305
View directory record Official record
Conditions
Influenza
Interventions
Placebo, Trivalent Inactivated Influenza
Drug · Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
21 Years and older
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Aug 26, 2010 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Not applicable Interventional

Attaining and Maintaining Wellness in Obsessive-compulsive Disorder

NCT01686087
View directory record Official record
Conditions
Obsessive Compulsive Disorder
Interventions
Monthly Booster Sessions of EX/RP, Visits with MD and independent evaluators
Behavioral · Procedure
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
18 Years to 75 Years
Enrollment
137 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2018
U.S. locations
2
States / cities
New York, New York • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 12, 2019 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

A Study of Ad26.COV2.S in Adults (COVID-19)

NCT04436276
View directory record Official record
Conditions
Covid-19 Prevention
Interventions
Ad26.COV2.S, Placebo
Biological
Lead sponsor
Janssen Vaccines & Prevention B.V.
Industry
Eligibility
18 Years and older
Enrollment
1,085 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
7
States / cities
San Diego, California • Melbourne, Florida • Peoria, Illinois + 4 more
Source: ClinicalTrials.gov public record
Updated Feb 3, 2025 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Long-Term Safety and Antibody Persistence of TDV and the Impact of a Booster Dose

NCT03999996
View directory record Official record
Conditions
Dengue Fever
Interventions
Takeda's Dengue Tetravalent Vaccine (Live, Attenuated) (TDV), Placebo
Biological
Lead sponsor
Takeda
Industry
Eligibility
13 Years to 63 Years
Enrollment
365 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2024
U.S. locations
8
States / cities
Huntsville, Alabama • Peoria, Illinois • Newton, Kansas + 5 more
Source: ClinicalTrials.gov public record
Updated Jul 29, 2026 · Synced Sep 6, 2026, 10:37 PM EDT
Active, not recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Study of a Human Metapneumovirus/Respiratory Syncytial Virus mRNA Vaccine Candidate Encapsulated in a Lipid Nanoparticle-based Formulation in Adults Aged 60 Years and Older

NCT06686654
View directory record Official record
Conditions
Human Metapneumovirus Immunization, Respiratory Syncytial Virus Immunization
Interventions
Investigational hMPV/RSV vaccine, Investigational hMPV vaccine (monovalent), Investigational RSV vaccine (monovalent), Licensed RSV Vaccine, Placebo, Investigational RSV+hMPV vaccine
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
60 Years and older
Enrollment
1,530 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
24
States / cities
Phoenix, Arizona • Garden Grove, California • Gardena, California + 20 more
Source: ClinicalTrials.gov public record
Updated Dec 10, 2025 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Dose Escalation Study to Evaluate Safety, Reactogenicity, and Immunogenicity of mRNA-1345 in Healthy Adults and in Children Who Are Respiratory Syncytial Virus (RSV)-Seropositive

NCT04528719
View directory record Official record
Conditions
Respiratory Syncytial Virus
Interventions
mRNA-1345, Placebo
Biological · Drug
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
12 Months to 79 Years
Enrollment
651 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
31
States / cities
La Mesa, California • West Hollywood, California • DeLand, Florida + 28 more
Source: ClinicalTrials.gov public record
Updated Aug 6, 2024 · Synced Sep 6, 2026, 10:37 PM EDT
Active, not recruiting Phase 2 Interventional

A Study to Evaluate the Efficacy, Safety, and Immunogenicity of mRNA-1647 Cytomegalovirus (CMV) Vaccine in Allogenic Hematopoietic Cell Transplantation (HCT) Participants.

NCT05683457
View directory record Official record
Conditions
Cytomegalovirus Infection
Interventions
mRNA-1647, Placebo
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
84 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
3
States / cities
Boston, Massachusetts • St Louis, Missouri • Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 9, 2026 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 1 Interventional Results available

Therapeutic Vaccine for HIV

NCT01859325
View directory record Official record
Conditions
HIV, Therapeutic Vaccine
Interventions
rVSV, IL-12 pDNA adjuvant, HIV-Mag pDNA, Placebo
Biological · Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 65 Years
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 2, 2020 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 1 Interventional

UB-312 in Patients With Synucleinopathies

NCT05634876
View directory record Official record
Conditions
Multiple System Atrophy, Parkinson Disease
Interventions
UB-312 Injection, Placebo Injection
Biological
Lead sponsor
NYU Langone Health
Other
Eligibility
40 Years to 75 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 15, 2026 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Cytomegalovirus Vaccine in Healthy Participants

NCT00712634
View directory record Official record
Conditions
Precancerous/Nonmalignant Condition
Interventions
CMVpp65-A*0201 peptide vaccine
Biological
Lead sponsor
City of Hope Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1997 – 2009
U.S. locations
1
States / cities
Duarte, California
Source: ClinicalTrials.gov public record
Updated Dec 20, 2009 · Synced Sep 6, 2026, 10:37 PM EDT
Not listed Phase 2 Interventional

TPIV100 and Sargramostim for the Treatment of HER2 Positive, Stage II-III Breast Cancer in Patients With Residual Disease After Chemotherapy and Surgery

NCT04197687
View directory record Official record
Conditions
Breast Adenocarcinoma, Stage II Breast Cancer AJCC v6 and v7, Stage IIA Breast Cancer AJCC v6 and v7, Stage IIB Breast Cancer AJCC v6 and v7, Stage III Breast Cancer AJCC v7, Stage IIIA Breast Cancer AJCC v7, Stage IIIB Breast Cancer AJCC v7, Stage IIIC Breast Cancer AJCC v7
Interventions
Multi-epitope HER2 Peptide Vaccine TPIV100, Pertuzumab, Placebo Administration, Sargramostim, Trastuzumab, Trastuzumab Emtansine
Biological · Other
Lead sponsor
Academic and Community Cancer Research United
Other
Eligibility
18 Years and older · Female only
Enrollment
480 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2025
U.S. locations
30
States / cities
Scottsdale, Arizona • Tucson, Arizona • Yuma, Arizona + 26 more
Source: ClinicalTrials.gov public record
Updated Dec 17, 2023 · Synced Sep 6, 2026, 10:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Live Recombinant Newcastle Disease Virus-vectored COVID-19 Vaccine Phase 1 Study.

NCT05181709
View directory record Official record
Conditions
SARS-CoV-2
Interventions
Sodium Chloride, NDV-HXP-S IN low dose, NDV-HXP-S IM low dose, NDV-HXP-S IN high dose, NDV-HXP-S IM high dose
Drug · Biological
Lead sponsor
Sean Liu
Other
Eligibility
18 Years to 59 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 16, 2025 · Synced Sep 6, 2026, 10:37 PM EDT