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Showing 1–24 of 154 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Fluzone High-Dose Clear all
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Study of a Quadrivalent High-Dose Influenza Vaccine and a Moderna COVID-19 Vaccine Administered Either Concomitantly or Singly in Participants 65 Years of Age and Older Previously Vaccinated With a 2-dose Schedule of Moderna COVID-19 Vaccine

NCT04969276
View directory record Official record
Conditions
Influenza Immunization, Healthy Volunteers
Interventions
Quadrivalent Inactivated Influenza High Dose, COVID-19 mRNA Vaccine (nucleoside modified)
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
65 Years and older
Enrollment
306 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
6
States / cities
Glendale, Arizona • San Diego, California • Vista, California + 3 more
Source: ClinicalTrials.gov public record
Updated Sep 11, 2025 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 4 Interventional Results available

Standard-dose Versus High-dose Flu Vaccine in Solid Organ Transplant.

NCT01808456
View directory record Official record
Conditions
Influenza, Human, Transplantation Infection
Interventions
influenza trivalent inactive vaccine, influenza trivalent inactive vaccine high dose
Biological
Lead sponsor
Inova Health Care Services
Other
Eligibility
18 Years to 70 Years
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
Falls Church, Virginia
Source: ClinicalTrials.gov public record
Updated Jul 21, 2022 · Synced Sep 2, 2026, 5:37 AM EDT
Recruiting Phase 3 Interventional

Randomized, Embedded, Multifactorial Adaptive Platform Trial for Community- Acquired Pneumonia

NCT02735707
View directory record Official record
Conditions
Community-acquired Pneumonia, Influenza, COVID-19
Interventions
Ceftriaxone, Moxifloxacin or Levofloxacin, Piperacillin-tazobactam, Ceftaroline, Amoxicillin-clavulanate, Standard course macrolide, Extended course macrolide, No systemic corticosteroid, Fixed-duration Hydrocortisone, Shock-dependent hydrocortisone, Fixed-duration higher dose Hydrocortisone, No antiviral agent for influenza, Five-days oseltamivir, Ten-days oseltamivir, No antiviral agent for COVID-19, Lopinavir / Ritonavir, Hydroxychloroquine, Hydroxychloroquine + lopinavir/ritonavir, Ivermectin, No immune modulation for COVID-19, Interferon beta-1a, Anakinra, Tocilizumab, Sarilumab, Local standard venous thromboprophylaxis, Therapeutic dose anticoagulation, Conventional low dose thromboprophylaxis, Intermediate dose thromboprophylaxis, Continuation of therapeutic dose anticoagulation, No immunoglobulin, Convalescent plasma, Delayed administration of convalescent plasma, No vitamin C, Vitamin C, No antiplatelet, Aspirin, P2Y12 inhibitor, No simvastatin, Simvastatin, Eritoran, Apremilast, Clinician-preferred mechanical ventilation strategy, Protocolised mechanical ventilation strategy, No renin-angiotensin system inhibitor, Angiotensin converting enzyme inhibitor, Angiotensin Receptor Blockers, ARB + DMX-200, No cysteamine, Cysteamine, Fixed-duration dexamethasone, Baloxavir Marboxil, Five-days oseltamivir + baloxavir marboxil, Ten-days oseltamivir + baloxavir marboxil, No endothelial modulator, Imatinib, No Immune Modulator for Influenza, Baricitinib, Nirmatrelvir/ritonavir, Remdesivir, Nirmatrelvir/ritonavir + remdesivir
Drug · Other · Biological + 1 more
Lead sponsor
UMC Utrecht
Other
Eligibility
18 Years and older
Enrollment
20,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2028
U.S. locations
11
States / cities
Jacksonville, Florida • Augusta, Georgia • Chicago, Illinois + 8 more
Source: ClinicalTrials.gov public record
Updated Jul 11, 2024 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Safety and Immunogenicity of Quadrivalent Influenza mRNA Vaccine MRT5410 in Adult Participants 18 Years of Age and Older

NCT05624606
View directory record Official record
Conditions
Influenza Immunization
Interventions
Quadrivalent Influenza mRNA Vaccine MRT5410, Quadrivalent Recombinant Influenza vaccine RIV4, Quadrivalent Inactivated Influenza Standard Dose QIV-SD, Quadrivalent Inactivated Influenza High Dose QIV-HD
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
18 Years and older
Enrollment
682 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
23
States / cities
Huntington Park, California • Long Beach, California • North Hollywood, California + 19 more
Source: ClinicalTrials.gov public record
Updated Mar 17, 2025 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Safety, Reactogenicity and Immunogenicity of an H5N1 VLP

NCT00519389
View directory record Official record
Conditions
Pandemic Influenza
Interventions
H5N1 VLP Vaccine, Placebo
Biological
Lead sponsor
Novavax
Industry
Eligibility
18 Years to 40 Years
Enrollment
230 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Jun 20, 2013 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

A(H7N9) VLP Antigen Dose-Ranging Study With Matrix-M1™ Adjuvant

NCT02078674
View directory record Official record
Conditions
Influenza (Pandemic)
Interventions
Monovalent Avian Influenza VLP (H7N9), Matrix-M1™ adjuvant, Placebo
Biological
Lead sponsor
Novavax
Industry
Eligibility
18 Years to 64 Years
Enrollment
610 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
5
States / cities
Walnut Creek, California • Miami, Florida • Meridian, Idaho + 2 more
Source: ClinicalTrials.gov public record
Updated Sep 22, 2016 · Synced Sep 2, 2026, 5:37 AM EDT
Terminated Phase 2 Interventional Results available

Reduced-intensity, Related-donor Bone Marrow Transplantation Followed by High-dose Cyclophosphamide for Hematologic Cancers

NCT01135329
View directory record Official record
Conditions
Lymphoma, Leukemia, Myelodysplastic Syndrome
Interventions
Fludarabine, Busulfan, Cyclophosphamide, Mycophenolate Mofetil, Tacrolimus
Drug
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
6 Months to 75 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated May 26, 2026 · Synced Sep 2, 2026, 5:37 AM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

The Safety, Tolerance, and Immunogenicity of MAS-1-Adjuvanted Seasonal Inactivated Influenza Vaccine (MER4101)

NCT02500680
View directory record Official record
Conditions
Influenza, Human
Interventions
MER4101, Inactivated Influenza Vaccine
Biological
Lead sponsor
Nova Immunotherapeutics Limited
Industry
Eligibility
18 Years and older
Enrollment
102 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2020
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Sep 5, 2019 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 3 Interventional Results available

A Study of an Ad26.RSV.preF-based Vaccine and High-dose Seasonal Influenza Vaccine, With and Without Coadministration, in Adults Aged 65 Years and Older

NCT05071313
View directory record Official record
Conditions
Influenza, Human Prevention, Respiratory Syncytial Viruses Prevention
Interventions
Ad26.RSV.preF-based vaccine, Quadrivalent High-dose Influenza Vaccine, Placebo
Biological
Lead sponsor
Janssen Vaccines & Prevention B.V.
Industry
Eligibility
65 Years and older
Enrollment
777 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
19
States / cities
Long Beach, California • Hollywood, Florida • Port Orange, Florida + 14 more
Source: ClinicalTrials.gov public record
Updated May 24, 2025 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 2 Interventional Results available

Systems Analyses of the Immune Response to the Seasonal Influenza Vaccine

NCT04025580
View directory record Official record
Conditions
Healthy Volunteer
Interventions
Flucelvax, Fluvirin, Fluzone High Dose
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
98 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 1, 2024 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 2 Interventional Results available

High Dose Flu Vaccine in Treating Children Who Have Undergone Donor Stem Cell Transplant

NCT02860039
View directory record Official record
Conditions
Hematopoietic Cell Transplantation Recipient, Malignant Neoplasm, Influenza
Interventions
Trivalent Influenza Vaccine, Quadrivalent Influenza Vaccine, Laboratory Biomarker Analysis
Biological · Other
Lead sponsor
Vanderbilt-Ingram Cancer Center
Other
Eligibility
3 Years to 17 Years
Enrollment
170 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2024
U.S. locations
9
States / cities
San Francisco, California • Kansas City, Missouri • Cincinnati, Ohio + 6 more
Source: ClinicalTrials.gov public record
Updated Oct 21, 2024 · Synced Sep 2, 2026, 5:37 AM 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 29, 2021 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 2 Interventional Results available

Study of an Investigational Monoclonal Antibody, VIS410, in Subjects With Uncomplicated Influenza A

NCT02989194
View directory record Official record
Conditions
Influenza
Interventions
VIS410 low dose, VIS410 high dose, Placebo
Drug
Lead sponsor
Visterra, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017
U.S. locations
11
States / cities
Huntsville, Alabama • Coral Gables, Florida • Homestead, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Aug 14, 2022 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

A Study to Learn About Flu and COVID-19 Vaccine Responses in Healthy People

NCT06683352
View directory record Official record
Conditions
Influenza,Human, COVID-19
Interventions
Investigational Influenza Vaccine, COVID-19 Vaccine, Investigational Influenza/COVID-19 Vaccine, Licensed Influenza Vaccine 1, Licensed Influenza Vaccine 2, Placebo
Biological · Combination Product · Other
Lead sponsor
BioNTech SE
Industry
Eligibility
18 Years and older
Enrollment
1,353 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
22
States / cities
Lake Forest, California • San Diego, California • Walnut Creek, California + 17 more
Source: ClinicalTrials.gov public record
Updated Aug 18, 2026 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Not applicable Interventional

Seasonal Influenza Vaccine High Dose Boosting in Solid Organ Transplant Recipients

NCT05663463
View directory record Official record
Conditions
Solid Organ Transplant
Interventions
Fluzone High-Dose - 2 doses, Fluzone High-Dose - 1 dose of HD
Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 14, 2025 · Synced Sep 2, 2026, 5:37 AM EDT
Recruiting Phase 2 Interventional

High vs. Standard Dose Influenza Vaccine in Lung Allograft Recipients

NCT05215327
View directory record Official record
Conditions
Immunization; Infection, Transplantation Infection, Influenza
Interventions
High Dose Quadrivalent Inactivated Influenza Vaccine, Standard Dose Quadrivalent Inactivated Influenza Vaccine
Biological
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
16 Years and older
Enrollment
270 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Dec 7, 2025 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Safety and Immunogenicity of Different Formulations of an MF59-Adjuvanted Influenza Vaccine in Older Adults ≥50 Years of Age

NCT05501561
View directory record Official record
Conditions
Influenza, Human
Interventions
Experimental: IIV-A Investigational IIV-A administered as a single dose intramuscularly on Day 1, Experimental: aIIV-B Investigational aIIV-B administered as a single dose intramuscularly on Day 1, Experimental: aIIV-C Investigational aIIV-C administered as a single dose intramuscularly on Day 1, Active Comparator: Licensed IIV IIV administered as a single dose intramuscularly on Day 1
Biological
Lead sponsor
Seqirus
Industry
Eligibility
50 Years and older
Enrollment
1,056 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
47
States / cities
Tempe, Arizona • Huntington Beach, California • San Diego, California + 42 more
Source: ClinicalTrials.gov public record
Updated Jun 29, 2026 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 4 Interventional Results available

ED Influenza Therapeutic Pilot Study: Oseltamivir vs. Peramivir

NCT02609399
View directory record Official record
Conditions
Influenza
Interventions
Oseltamivir, Peramivir
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 100 Years
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
2
States / cities
Phoenix, Arizona • Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 3, 2019 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Duration of Immune Response to Influenza Vaccination in Patients With RA

NCT02311855
View directory record Official record
Conditions
Rheumatoid Arthritis
Interventions
Influenza vaccine
Biological
Lead sponsor
Bassett Healthcare
Other
Eligibility
40 Years to 75 Years
Enrollment
87 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Cooperstown, New York
Source: ClinicalTrials.gov public record
Updated Jan 5, 2017 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 4 Interventional Results available

High Dose Influenza Vaccine in Nursing Home - Pilot Study

NCT01720277
View directory record Official record
Conditions
Influenza
Interventions
HD Fluzone Vaccine, SD Fluzone Vaccine
Biological
Lead sponsor
Insight Therapeutics, LLC
Other
Eligibility
65 Years and older
Enrollment
2,957 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
2
States / cities
Providence, Rhode Island • Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated May 22, 2018 · Synced Sep 2, 2026, 5:37 AM EDT
Active, not recruiting Phase 4 Interventional Accepts healthy volunteers

B Cell and Antibody Response to Seasonal Influenza Vaccines in Younger and Older Adults

NCT04101838
View directory record Official record
Conditions
Influenza
Interventions
Fluzone, Flucelvax, Fluzone High-Dose, Fluad
Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 80 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 4 Interventional Results available

FLUAD vs. FLUZONE HD Influenza Vaccine in Residents of Long Term Care

NCT03694808
View directory record Official record
Conditions
Flu
Interventions
Fluad Vaccine, Fluzone HD Vaccine
Drug
Lead sponsor
David H. Canaday
Other
Eligibility
65 Years and older
Enrollment
478 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
2
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 29, 2024 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Safety and Immunogenicity of Fluzone® Quadrivalent, Flublok® Quadrivalent, and Fluzone® High-Dose, Influenza Vaccines, 2018-2019 Formulations

NCT03617523
View directory record Official record
Conditions
Influenza
Interventions
Fluzone Quadrivalent vaccine, 2018-2019 formulation, Flublok Quadrivalent vaccine, 2018-2019 formulation, Fluzone High-Dose vaccine, 2018-2019 formulation
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
6 Months and older
Enrollment
240 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
3
States / cities
Bardstown, Kentucky • Metairie, Louisiana • Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Mar 28, 2022 · Synced Sep 2, 2026, 5:37 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effects of Aging on Primary and Secondary Vaccine Responses

NCT03312699
View directory record Official record
Conditions
Influenza, Hepatitis A, Typhoid, Healthy Adults
Interventions
Fluzone® quadrivalent, Fluzone High Dose, Fluad, Vaqta, Typhim Vi, Vivotif
Biological
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2023
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Dec 15, 2024 · Synced Sep 2, 2026, 5:37 AM EDT