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Showing 1–22 of 22 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: The second booster vaccine phase: Clear all
Completed Phase 2Phase 3 Interventional

A Study to Evaluate the Safety and Immunogenicity of an (Omicron Subvariant) COVID-19 Vaccine Booster Dose in Previously Vaccinated Participants and Unvaccinated Participants.

NCT05975060
View directory record Official record
Conditions
COVID-19
Interventions
XBB.1.5 Vaccine (Booster), XBB.1.5 Vaccine (single dose)
Biological
Lead sponsor
Novavax
Industry
Eligibility
18 Years to 54 Years
Enrollment
660 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
30
States / cities
Mobile, Alabama • Sacramento, California • Colorado Springs, Colorado + 26 more
Source: ClinicalTrials.gov public record
Updated May 29, 2024 · Synced Sep 28, 2026, 10:12 AM EDT
Recruiting Phase 2 Interventional

Anti-pneumococcal Vaccine Strategy in Patients With Chronic Lymphocytic Leukemia

NCT05417165
View directory record Official record
Conditions
Chronic Lymphocytic Leukemia, Small Lymphocytic Lymphoma
Interventions
Pneumococcal 20-valent Conjugate Vaccine, Pneumococcal Polyvalent Vaccine
Biological
Lead sponsor
Seema Bhat
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 6, 2026 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety and Immunogenicity of 2 or 3 Doses of MenACWY Conjugate Vaccine in Healthy Infants and the Effects of a Booster Dose of MenACWY Administered in the Second Year of Life

NCT01214837
View directory record Official record
Conditions
Meningococcal Disease, Meningococcal Meningitis
Interventions
MenACWY-CRM, Routine Vaccines
Biological
Lead sponsor
Novartis Vaccines
Industry
Eligibility
55 Days to 89 Days
Enrollment
751 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
37
States / cities
Birmingham, Alabama • Fayetteville, Arkansas • Jonesboro, Arkansas + 30 more
Source: ClinicalTrials.gov public record
Updated Oct 8, 2018 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

RSV-MVA-BN Vaccine Phase II Trial in ≥ 55 Year Old Adults

NCT02873286
View directory record Official record
Conditions
Respiratory Syncytial Virus Infections
Interventions
MVA-BN-RSV, Placebo
Biological · Other
Lead sponsor
Bavarian Nordic
Industry
Eligibility
55 Years and older
Enrollment
420 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
12
States / cities
Redding, California • San Diego, California • The Villages, Florida + 9 more
Source: ClinicalTrials.gov public record
Updated Sep 21, 2020 · Synced Sep 28, 2026, 10:12 AM EDT
Active, not recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Study to Evaluate the Safety, Reactogenicity, and Immunogenicity of mRNA-1403 and mRNA-1405 to Prevent Norovirus Acute Gastroenteritis in Healthy Adults 18 to 80 Years of Age

NCT05992935
View directory record Official record
Conditions
Norovirus Acute Gastroenteritis
Interventions
mRNA-1403, mRNA-1405, Placebo
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
1,407 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
14
States / cities
Long Beach, California • Longmont, Colorado • Hollywood, Florida + 11 more
Source: ClinicalTrials.gov public record
Updated Apr 2, 2026 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Safety and Immunogenicity Study of the Eastern Equine Encephalitis (EEE) Vaccine

NCT02654509
View directory record Official record
Conditions
Eastern Equine Encephalitis
Interventions
Eastern Equine Encephalitis Vaccine, Inactivated, Dried, TSI-GSD 104
Biological
Lead sponsor
U.S. Army Medical Research and Development Command
Federal
Eligibility
18 Years to 65 Years
Enrollment
138 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2018
U.S. locations
1
States / cities
Fort Deterick, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 16, 2020 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Delayed Heterologous SARS-CoV-2 Vaccine Dosing (Boost) After Receipt of EUA Vaccines

NCT04889209
View directory record Official record
Conditions
COVID-19
Interventions
Ad26.COV2.S, BNT162b2, mRNA-1273, mRNA-1273.211, mRNA-1273.222, SARS-CoV-2 rS/M1
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 99 Years
Enrollment
867 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
10
States / cities
Decatur, Georgia • Baltimore, Maryland • New York, New York + 6 more
Source: ClinicalTrials.gov public record
Updated Apr 19, 2025 · Synced Sep 28, 2026, 10:12 AM 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 28, 2026, 10:12 AM 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 28, 2026, 10:12 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Safety of and Immune Response to a Tick-Borne Encephalitis Vaccine (LGT(TP21)/DEN4) in Healthy Adults

NCT00118924
View directory record Official record
Conditions
Tick-Borne Encephalitis
Interventions
LGT(TP21)/DEN4, Placebo
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 50 Years
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2007
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 20, 2008 · Synced Sep 28, 2026, 10:12 AM 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 28, 2026, 10:12 AM EDT
Terminated Phase 3 Interventional Results available

Janssen Ad26.CoV2.S Vaccine Booster in Kidney Transplant Recipients

NCT05220397
View directory record Official record
Conditions
Kidney Transplant Recipient
Interventions
Janssen Ad26.CoV2.S Vaccine, Reduction in Immunosuppression Medication, Maintenance in Immunosuppression Medication
Biological · Other
Lead sponsor
Mark Stegall
Other
Eligibility
18 Years and older
Enrollment
468 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
3
States / cities
Phoenix, Arizona • Jacksonville, Florida • Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 14, 2025 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Vaccination-Dendritic Cells With Peptides for Recurrent Malignant Gliomas

NCT00766753
View directory record Official record
Conditions
Malignant Glioma
Interventions
Dendritic vaccine pulsed with multiple peptides, The first booster vaccine phase:, The second booster vaccine phase:
Biological
Lead sponsor
Frank Lieberman
Other
Eligibility
18 Years and older
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2016
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 6, 2018 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Evaluation of Meningococcal Immune Response Among Children Who Previously Received MenACWY Conjugate Vaccine

NCT01148017
View directory record Official record
Conditions
Meningococcal Meningitis
Interventions
Meningococcal (groups A, C, W, and Y) oligosaccharide diphtheria CRM-197 conjugate vaccine
Biological
Lead sponsor
Novartis Vaccines
Industry
Eligibility
37 Months to 63 Months
Enrollment
433 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
19
States / cities
Birmingham, Alabama • Downey, California • Oakland, California + 15 more
Source: ClinicalTrials.gov public record
Updated Aug 13, 2017 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Safety and Immunogenicity Study of Rift Valley Fever Vaccine

NCT00584194
View directory record Official record
Conditions
Rift Valley Fever
Interventions
TSI-GSD 200 RVF Vaccine
Biological
Lead sponsor
U.S. Army Medical Research and Development Command
Federal
Eligibility
17 Years and older
Enrollment
278 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2010
U.S. locations
1
States / cities
Fort Deterick, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 2, 2020 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Immunogenicity and Safety of mRNA Vaccine Boosters for SARS-CoV-2 (COVID-19) Variants

NCT04927065
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273.211, mRNA-1273, mRNA-1273.617.2, mRNA-1273.213, mRNA-1273.529, mRNA-1273.214, mRNA-1273.222, mRNA-1273.815, mRNA-1273.231
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
5,161 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
23
States / cities
Sacramento, California • Hollywood, Florida • Jacksonville, Florida + 18 more
Source: ClinicalTrials.gov public record
Updated Feb 27, 2025 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Safety and Effects of an Investigational COVID-19 Vaccine as Booster in Healthy People

NCT05541861
View directory record Official record
Conditions
SARS-CoV-2 Infection, COVID-19
Interventions
BNT162b2 Bivalent (original/Omicron BA.4/BA.5) 30 mcg, BNT162b4 5 mcg, BNT162b4 10 mcg, BNT162b4 15 mcg, BNT162b4 30 mcg, BNT162b2 Monovalent (OMI XBB.1.5) 30 mcg
Biological
Lead sponsor
BioNTech SE
Industry
Eligibility
18 Years and older
Enrollment
383 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
17
States / cities
Tempe, Arizona • Newport Beach, California • San Diego, California + 13 more
Source: ClinicalTrials.gov public record
Updated Jan 12, 2026 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

A Study to Evaluate the Efficacy, Immune Response, and Safety of a COVID-19 Vaccine in Adults ≥ 18 Years With a Pediatric Expansion in Adolescents (12 to<18 Years) at Risk for SARS-CoV-2

NCT04611802
View directory record Official record
Conditions
SARS-CoV Infection, Covid19
Interventions
SARS-CoV-2 rS/Matrix-M1 Adjuvant (Initial Vaccination Period), Placebo (Initial Vaccination Period), SARS-CoV-2 rS/Matrix-M1 Adjuvant (Crossover Vaccination period), Placebo (Crossover Vaccination period), SARS-CoV-2 rS/Matrix-M1 Adjuvant (Booster Vaccination), SARS-CoV-2 rS/Matrix-M1 Adjuvant (Second Booster Vaccination)
Biological · Other
Lead sponsor
Novavax
Industry
Eligibility
12 Years and older
Enrollment
33,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
144
States / cities
Birmingham, Alabama • Phoenix, Arizona • Tempe, Arizona + 110 more
Source: ClinicalTrials.gov public record
Updated Dec 20, 2023 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Phase 3 Study of Novavax Vaccine(s) as Booster Dose After mRNA Vaccines

NCT05875701
View directory record Official record
Conditions
COVID-19
Interventions
NVX-CoV2373, SARS-CoV-2 rS antigen/Matrix-M Adjuvant
Biological
Lead sponsor
Novavax
Industry
Eligibility
18 Years to 49 Years
Enrollment
147 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
5
States / cities
Austin, Texas • Fort Worth, Texas • Plano, Texas + 1 more
Source: ClinicalTrials.gov public record
Updated Jun 25, 2025 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Immunogenicity and Safety of mRNA-1283 COVID-19 Vaccine Boosters

NCT05137236
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1283, mRNA-1283.211, mRNA-1273, mRNA-1283.529
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
540 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
17
States / cities
Phoenix, Arizona • Hollywood, Florida • Sunrise, Florida + 13 more
Source: ClinicalTrials.gov public record
Updated Jul 16, 2025 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study of Ad26.COV2.S for the Prevention of SARS-CoV-2-mediated COVID-19 in Adults

NCT04614948
View directory record Official record
Conditions
Participants With or Without Stable Co-morbidities Associated With Progression to Severe COVID-19
Interventions
Ad26.COV2.S, Placebo
Biological · Other
Lead sponsor
Janssen Vaccines & Prevention B.V.
Industry
Eligibility
18 Years and older
Enrollment
31,835 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
63
States / cities
Vestavia Hills, Alabama • Phoenix, Arizona • Tucson, Arizona + 53 more
Source: ClinicalTrials.gov public record
Updated Feb 3, 2025 · Synced Sep 28, 2026, 10:12 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study on the Immune Response and Safety of the Shingles Vaccine and the Influenza Vaccine When Either is Given to Healthy Adults at the Same Time or Following a COVID-19 Booster Vaccine

NCT05047770
View directory record Official record
Conditions
Herpes Zoster
Interventions
HZ/su, Flu D-QIV, mRNA-1273
Biological · Combination Product
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years and older
Enrollment
2,013 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
46
States / cities
Tempe, Arizona • Oxnard, California • San Diego, California + 40 more
Source: ClinicalTrials.gov public record
Updated Nov 12, 2023 · Synced Sep 28, 2026, 10:12 AM EDT