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ClinicalTrials.gov public records Last synced Oct 7, 2026, 2:19 AM EDT

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Showing 1–24 of 56 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: High-dose quadrivalent influenza virus vaccine Clear all
Completed Phase 4 Interventional Results available

INfluenza Vaccine to Effectively Stop Cardio Thoracic Events and Decompensated Heart Failure

NCT02787044
View directory record Official record
Conditions
Heart Failure, Myocardial Infarction
Interventions
High Dose Trivalent Influenza Vaccine, Standard Dose Quadrivalent Influenza Vaccine
Biological
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Enrollment
5,388 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
127
States / cities
Birmingham, Alabama • Huntsville, Alabama • Anchorage, Alaska + 93 more
Source: ClinicalTrials.gov public record
Updated Jan 21, 2022 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Immunogenicity, Safety and Tolerability of a Plant-Derived Seasonal Virus-Like-Particle Quadrivalent Influenza Vaccine in Adults

NCT02233816
View directory record Official record
Conditions
Virus Diseases, RNA Virus Infections, Respiratory Tract Diseases, Respiratory Tract Infections
Interventions
Low dose of quadrivalent VLP vaccine, Medium dose of quadrivalent VLP vaccine, High dose of quadrivalent VLP vaccine, Placebo
Biological
Lead sponsor
Medicago
Industry
Eligibility
18 Years to 49 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
2
States / cities
Hollywood, Florida • Miami, Florida
Source: ClinicalTrials.gov public record
Updated Nov 13, 2019 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Safety, Tolerability and Immunogenicity of a Plant-made Seasonal Quadrivalent VLP Influenza Vaccine in Adults

NCT01991587
View directory record Official record
Conditions
Virus Diseases, RNA Virus Infections, Respiratory Tract Diseases, Respiratory Tract Infections
Interventions
Low dose of quadrivalent VLP vaccine, Medium dose of quadrivalent VLP vaccine, High dose of quadrivalent VLP vaccine, Placebo
Biological
Lead sponsor
Medicago
Industry
Eligibility
18 Years to 49 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jun 11, 2020 · Synced Oct 7, 2026, 2:19 AM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

Phase 2 Dose and Formulation Confirmation of Quad-NIV in Older Adults

NCT03658629
View directory record Official record
Conditions
Influenza, Human
Interventions
NanoFlu (Quad-NIV), Matrix-M Adjuvant, Placebo, Fluzone HD, Flublok Quadrivalent, Influenza Vaccine
Biological · Other
Lead sponsor
Novavax
Industry
Eligibility
65 Years and older
Enrollment
1,375 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
14
States / cities
Hollywood, Florida • Savannah, Georgia • Stockbridge, Georgia + 11 more
Source: ClinicalTrials.gov public record
Updated Nov 4, 2022 · Synced Oct 7, 2026, 2:19 AM EDT
Active, not recruiting Phase 4 Interventional Accepts healthy volunteers

Tfh Dysfunction in HIV and Aging

NCT04487041
View directory record Official record
Conditions
Human Influenza
Interventions
Standard dose influenza vaccination, High dose influenza vaccination
Biological
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2027
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jul 17, 2026 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Comparison of Immune Responses to Influenza Vaccine In Adults of Different Ages (SLVP015 2007-2017)

NCT01827462
View directory record Official record
Conditions
Influenza
Interventions
Trivalent, inactivated influenza vaccine (TIV), Quadrivalent, inactivated influenza vaccine (IIV4), High-Dose Trivalent, inactivated influenza vaccine (TIV High-Dose)
Biological
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 100 Years
Enrollment
136 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2017
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Jul 11, 2017 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Quadrivalent Influenza VLP Vaccine Dose Ranging Study in Young Adults

NCT02307851
View directory record Official record
Conditions
Influenza
Interventions
Quadrivalent VLP Vaccine, Comparator TIV
Biological
Lead sponsor
Novavax
Industry
Eligibility
18 Years to 49 Years
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
5
States / cities
Anaheim, California • Miami, Florida • Lenexa, Kansas + 2 more
Source: ClinicalTrials.gov public record
Updated Sep 23, 2016 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Study of Fluzone® Quadrivalent, Fluzone® Intradermal, and Fluzone® High-Dose Influenza Virus Vaccines in Adults

NCT01946438
View directory record Official record
Conditions
Influenza
Interventions
Fluzone® Quadrivalent, Influenza Virus Vaccine (2013-2014 formulation),, Fluzone® Intradermal, Influenza Virus Vaccine (2013-2014 formulation),, Fluzone® High-Dose, Influenza Virus Vaccine (2013-2014 formulation)
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
18 Years and older
Enrollment
208 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
4
States / cities
Santa Rosa, California • Council Bluffs, Iowa • Metairie, Louisiana + 1 more
Source: ClinicalTrials.gov public record
Updated Sep 25, 2014 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Safety and Immunogenicity of Quadrivalent Influenza mRNA Vaccine MRT5413 in Adult Participants18 Years of Age and Older

NCT05650554
View directory record Official record
Conditions
Influenza Immunization
Interventions
Quadrivalent Influenza mRNA Vaccine MRT5413, Quadrivalent Recombinant Influenza Vaccine, Quadrivalent Influenza Standard Dose Vaccine, Quadrivalent Influenza High-Dose Vaccine
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
28
States / cities
Chula Vista, California • Gardena, California • Long Beach, California + 24 more
Source: ClinicalTrials.gov public record
Updated Mar 19, 2025 · Synced Oct 7, 2026, 2:19 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 16, 2024 · Synced Oct 7, 2026, 2:19 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 29, 2022 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study to Evaluate the Safety and Immunogenicity of KBP-V001 Quadrivalent Influenza Vaccine in Healthy Adults

NCT04439695
View directory record Official record
Conditions
Influenza
Interventions
Low dose, Intermediate dose, High dose, Placebo
Biological
Lead sponsor
KBio Inc
Industry
Eligibility
18 Years to 49 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Sep 16, 2021 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety and Immunogenicity of High-Dose Quadrivalent Influenza Vaccine in Participants ≥65 Years in the US

NCT03282240
View directory record Official record
Conditions
Influenza
Interventions
QIV-HD, Licensed TIV-HD1, Investigational TIV-HD2
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
65 Years and older
Enrollment
2,670 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
36
States / cities
Anaheim, California • Redding, California • San Diego, California + 29 more
Source: ClinicalTrials.gov public record
Updated Apr 7, 2022 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

A Study to Investigate the Safety and Immunogenicity of the Quadrivalent Influenza mRNA Vaccines in Adults Aged 18 Years and Above

NCT06361875
View directory record Official record
Conditions
Influenza Immunization, Healthy Volunteers
Interventions
Quadrivalent Influenza mRNA Vaccine MRT5421, Quadrivalent Influenza mRNA Vaccine MRT5424, Quadrivalent Influenza mRNA Vaccine MRT5429, Quadrivalent Influenza Standard Dose Vaccine, Quadrivalent Influenza High-Dose Vaccine, Quadrivalent Recombinant Influenza Vaccine
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
18 Years and older
Enrollment
908 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
11
States / cities
San Diego, California • Hialeah, Florida • Hollywood, Florida + 8 more
Source: ClinicalTrials.gov public record
Updated Aug 4, 2026 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study to Assess the Safety and Immunogenicity of Monovalent mRNA NA Vaccine in Adult Participants 18 Years of Age and Older

NCT05426174
View directory record Official record
Conditions
Influenza Immunization, Healthy Volunteers
Interventions
mRNA NA vaccine, High Dose Quadrivalent Influenza Vaccine
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
18 Years and older
Enrollment
233 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
6
States / cities
Huntsville, Alabama • Phoenix, Arizona • San Diego, California + 3 more
Source: ClinicalTrials.gov public record
Updated Sep 15, 2025 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study To Learn About The Study Vaccine (Called Self-Amplifying Ribonucleic Acid (RNA)) For The Prevention of Influenza

NCT05227001
View directory record Official record
Conditions
Influenza, Human
Interventions
PF-07852352 Influenza saRNA 1, PF-07836391 Influenza saRNA, PF-07836394 Influenza saRNA, PF-07836395 Influenza saRNA, PF-07836396 Influenza saRNA, PF-07867246 Influenza saRNA, Placebo, Quadrivalent influenza vaccine (QIV), PF-07871987 Influenza saRNA, PF-07914705 Influenza saRNA, PF-07915048 Influenza saRNA
Biological
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 49 Years
Enrollment
440 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
24
States / cities
Phoenix, Arizona • Walnut Creek, California • Greenacres City, Florida + 13 more
Source: ClinicalTrials.gov public record
Updated Mar 20, 2026 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Senescent Immunity in Elders and Vaccine Responses (SILVER)

NCT04077424
View directory record Official record
Conditions
Flu Vaccine
Interventions
Fluzone-High Dose Quadrivalent, Fluad, Flublock
Biological
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
65 Years to 125 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 12, 2022 · Synced Oct 7, 2026, 2:19 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 15, 2025 · Synced Oct 7, 2026, 2:19 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Fluad vs. Fluzone High-Dose Vaccine Effectiveness Among Adults ≥65 Years

NCT06029933
View directory record Official record
Conditions
Influenza, Community-acquired Pneumonia, Cardiovascular Events
Interventions
Adjuvanted Quadrivalent Inactivated Influenza Vaccine (aIIV4), High-Dose Quadrivalent Inactivated Influenza Vaccine (HD-IIV4)
Biological
Lead sponsor
Kaiser Permanente
Other
Eligibility
65 Years and older
Enrollment
1,500,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2028
U.S. locations
1
States / cities
Oakland, California
Source: ClinicalTrials.gov public record
Updated Aug 5, 2026 · Synced Oct 7, 2026, 2:19 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 18, 2025 · Synced Oct 7, 2026, 2:19 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 6, 2019 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Adjuvanted Seasonal Recombinant Quadrivalent Virus-Like Particles (QVLP) Influenza Vaccine in Adults 65 Years of Age and Older

NCT04622592
View directory record Official record
Conditions
Influenza
Interventions
Instramuscular vaccine
Biological
Lead sponsor
Medicago
Industry
Eligibility
65 Years and older
Enrollment
209 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
14
States / cities
Huntsville, Alabama • Chandler, Arizona • San Diego, California + 11 more
Source: ClinicalTrials.gov public record
Updated Jul 21, 2023 · Synced Oct 7, 2026, 2:19 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Safety and Immunogenicity of Fluzone® Quadrivalent and Fluzone® High-Dose, Influenza Vaccines, 2016-2017 Formulations

NCT02908269
View directory record Official record
Conditions
Influenza
Interventions
Fluzone Quadrivalent vaccine, 2016-2017 formulation, No Preservative, Fluzone High-Dose, vaccine, 2016-2017 formulation
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
3 Years and older
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
2
States / cities
Bardstown, Kentucky • Metairie, Louisiana
Source: ClinicalTrials.gov public record
Updated Mar 29, 2022 · Synced Oct 7, 2026, 2:19 AM EDT
Terminated Phase 3 Interventional Accepts healthy volunteers Results available

Study on a High-Dose Quadrivalent Influenza Vaccine Compared With Standard-Dose Quadrivalent Influenza Vaccine in Children 6 Months Through 35 Months of Age

NCT04544267
View directory record Official record
Conditions
Influenza
Interventions
Quadrivalent influenza vaccine, high-dose, Quadrivalent influenza vaccine, standard dose
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
6 Months to 35 Months
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
10
States / cities
San Diego, California • Miami, Florida • Atlanta, Georgia + 6 more
Source: ClinicalTrials.gov public record
Updated Dec 24, 2025 · Synced Oct 7, 2026, 2:19 AM EDT