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ClinicalTrials.gov public records Last synced Oct 20, 2026, 2:55 AM EDT

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Showing 1–24 of 360 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Influenza Vaccination Clear all
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Influenza Virus Vaccine Plus Vitamin A and D Supplements for Prevention of Respiratory Virus Infections in Children

NCT02649192
View directory record Official record
Conditions
Healthy Participants
Interventions
Influenza virus vaccine, Vitamins A and D, Placebo
Biological · Dietary Supplement · Other
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
2 Years to 8 Years
Enrollment
87 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 29, 2019 · Synced Oct 20, 2026, 2:55 AM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Adaptive Immune Responses and Repertoire in Influenza Vaccination and Infection (SLVP031)

NCT03028987
View directory record Official record
Conditions
Influenza
Interventions
Fluzone®, FluMist®
Biological
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 49 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Sep 12, 2017 · Synced Oct 20, 2026, 2:55 AM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

pH1N1 Blinded Challenge Study

NCT07110532
View directory record Official record
Conditions
Influenza
Interventions
A/Arkansas/08/2020 (pH1N1), Sham/Diluent (1X SPG+Arg+Gel)
Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 55 Years
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
2
States / cities
Baltimore, Maryland • Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 20, 2026, 2:55 AM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Characterization of Humoral and Cellular Immune Responses Elicited by Influenza Vaccination in Healthy Adults

NCT05108818
View directory record Official record
Conditions
Influenza, Human
Interventions
Seasonal influenza vaccine
Biological
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
700 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2028
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 9, 2026 · Synced Oct 20, 2026, 2:55 AM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Durability of Vaccine Responses

NCT05801978
View directory record Official record
Conditions
Vaccine Response
Interventions
Live Attenuated Yellow Fever 17D Vaccine, Quadrivalent seasonal influenza vaccine
Biological
Lead sponsor
Emory University
Other
Eligibility
18 Years to 50 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
3
States / cities
Atlanta, Georgia • Decatur, Georgia
Source: ClinicalTrials.gov public record
Updated Jul 17, 2026 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Transcutaneous Immunization With an Attenuated Listeria Monocytogenes Vector Vaccine

NCT01311817
View directory record Official record
Conditions
Healthy Volunteers
Interventions
BMB72 (actA/plcB-deleted Listeria monocytogenes expressing influenza A nucleoprotein)
Biological
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 55 Years
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 2, 2015 · Synced Oct 20, 2026, 2:55 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Post-Marketing Observational Study of Safety Following Vaccination With Flublok® Compared to Licensed IIV in Adults

NCT02600585
View directory record Official record
Conditions
Human Influenza
Interventions
Recombinant Influenza Vaccine, Inactivated Influenza Vaccine
Biological
Lead sponsor
Protein Sciences Corporation
Industry
Eligibility
18 Years and older
Enrollment
254,648 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Oakland, California
Source: ClinicalTrials.gov public record
Updated Oct 12, 2017 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Not applicable Interventional Results available

Encouraging Flu Vaccination Among High-Risk Patients Identified by ML

NCT04323137
View directory record Official record
Conditions
Influenza, Vaccination, Health Promotion, Health Behavior, Risk Reduction
Interventions
Risk reduction, Medical records-based recommendation, Algorithm-based recommendation
Behavioral
Lead sponsor
Geisinger Clinic
Other
Eligibility
17 Years and older
Enrollment
117,649 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Danville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 30, 2024 · Synced Oct 20, 2026, 2:55 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Conversational Agent Vaccine Promotion RCT

NCT04884750
View directory record Official record
Conditions
Pandemics
Interventions
ECA-ACE Vaccination Promotion Intervention
Behavioral
Lead sponsor
Northeastern University
Other
Eligibility
18 Years and older
Enrollment
600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 22, 2023 · Synced Oct 20, 2026, 2:55 AM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Immune Responses to the Flu Shot During Pregnancy

NCT02148874
View directory record Official record
Conditions
Pregnancy
Interventions
influenza virus vaccination
Biological
Lead sponsor
Lisa Christian
Other
Eligibility
18 Years to 42 Years · Female only
Enrollment
287 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2019
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 24, 2019 · Synced Oct 20, 2026, 2:55 AM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Age and Response to Flu Vaccines

NCT03328325
View directory record Official record
Conditions
Influenza, Influenza Immunisation
Interventions
Influenza Virus Quadrivalent Inactivated Vaccine
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
9 Years to 99 Years
Enrollment
152 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
2
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Aug 28, 2026 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Not applicable Interventional

Integrated Stepped Care for Unhealthy Alcohol Use in HIV

NCT01410123
View directory record Official record
Conditions
Liver Diseases, Alcoholic, Alcoholism, HIV, Hepatitis C
Interventions
Integrated Stepped Care (ISC), Treatment as Usual
Other
Lead sponsor
Yale University
Other
Eligibility
21 Years and older
Enrollment
319 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
5
States / cities
Washington D.C., District of Columbia • Atlanta, Georgia • New York, New York + 2 more
Source: ClinicalTrials.gov public record
Updated Dec 21, 2022 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Characterizing Late-season Influenza Vaccine Responses to Compare the 2023 and 2024 Vaccine Formulations

NCT06567860
View directory record Official record
Conditions
Influenza A
Interventions
Influenza Fluzone vaccine
Biological
Lead sponsor
La Jolla Institute for Immunology
Other
Eligibility
18 Years to 64 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Feb 12, 2026 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

H7N9 Vaccination With and Without AS03 and Unadjuvanted H3N2v Vaccination: Standard and Systems Biology Analyses

NCT02921997
View directory record Official record
Conditions
Avian Influenza, H1N1 Influenza, Influenza
Interventions
AS03, Influenza Virus Vaccine, Monovalent A/H3N2v A/Minnesota/11/2010 NYMC X-203, Monovalent influenza A/H7N9 virus vaccine
Drug · Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 49 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 9, 2024 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Annual Study for Collection of Serum Samples in Children and Older Adults Receiving the 2021-2022 Formulations of Fluzone Quadrivalent Vaccine and Fluzone High-Dose Quadrivalent Vaccine, Respectively

NCT05050318
View directory record Official record
Conditions
Influenza Immunization, Healthy Volunteers
Interventions
Fluzone Quadrivalent vaccine, No Preservative (0.5-mL dose), 2021-2022 formulation, Fluzone High-Dose Quadrivalent vaccine (0.7-mL dose), 2021-2022 formulation
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
6 Months and older
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
2
States / cities
Bardstown, Kentucky • Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Sep 12, 2025 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Not applicable Interventional Results available

Patient Portal Flu Vaccine Reminders (RCT 6)

NCT06062264
View directory record Official record
Conditions
Influenza, Respiratory Tract Infections
Interventions
Portal-based Video Message, Portal-based Infographic Message
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
6 Months and older
Enrollment
22,233 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 20, 2025 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Entolimod on Immunosenescence in Healthy Geriatric Subjects Receiving Influenza Vaccination

NCT04176133
View directory record Official record
Conditions
Healthy
Interventions
Entolimod, Placebo, Influenza vaccine
Drug
Lead sponsor
Robert J. Pignolo
Other
Eligibility
65 Years and older
Enrollment
61 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2022
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 22, 2023 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Evaluate Safety & Immunogenicity of GSK Bio's Influenza Vaccine GSK576389A After Repeated Vaccination in Elderly Adults

NCT00529516
View directory record Official record
Conditions
Influenza
Interventions
Fluarix, GSK Biologicals Influenza Vaccine GSK576389A
Biological
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years and older
Enrollment
1,252 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
9
States / cities
Clearwater, Florida • Coral Gables, Florida • Milford, Massachusetts + 6 more
Source: ClinicalTrials.gov public record
Updated Jun 8, 2018 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Study to Determine the Immunogenicity and Safety of GlaxoSmithKline (GSK) Biologicals; Infanrix Hexa at 2, 4 and 6 Months of Age in Healthy Infants

NCT02096263
View directory record Official record
Conditions
Poliomyelitis, Diphtheria, Haemophilus Influenzae Type b, Tetanus, Acellular Pertussis, Hepatitis B
Interventions
Infanrix hexa, Pediarix, ActHIB, Pentacel, Engerix-B, Infanrix, Hiberix, Prevnar13, Rotarix
Biological
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
6 Weeks to 12 Weeks
Enrollment
585 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
43
States / cities
Tucson, Arizona • Fayetteville, Arkansas • Anaheim, California + 38 more
Source: ClinicalTrials.gov public record
Updated Nov 27, 2019 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Not applicable Interventional

Efficacy of Communication Modalities for Promoting Flu Shots

NCT05509270
View directory record Official record
Conditions
Influenza Vaccination, Health Promotion, Health Behavior, Risk Reduction
Interventions
Letter, Patient portal, SMS
Behavioral
Lead sponsor
Geisinger Clinic
Other
Eligibility
18 Years and older
Enrollment
43,225 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022
U.S. locations
1
States / cities
Danville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 12, 2022 · Synced Oct 20, 2026, 2:55 AM EDT
Recruiting No phase listed Observational

Influenza & COVID-19 Obstetric and Perinatal Epidemiology Study in India

NCT06168019
View directory record Official record
Conditions
Influenza, COVID-19, SARS-COV-2 Infection, Other Respiratory Viruses, Perinatal Morbidity, Infant Morbidity
Interventions
Exposures
Other
Lead sponsor
Boston University
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
10,000 participants
Timeline
2023 – 2028
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 28, 2025 · Synced Oct 20, 2026, 2:55 AM EDT
Completed No phase listed Observational

Studies of the Immune Response to Vaccination After Hematopoietic Stem Cell Transplantation

NCT01581164
View directory record Official record
Conditions
Hematopoietic Stem Cell Transplant
Interventions
Influenza vaccine, Varicella vaccine
Biological
Lead sponsor
University of California, San Francisco
Other
Eligibility
5 Years to 70 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated May 8, 2015 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Safety and Immune Response Study of GSK Biologicals' Influenza Virus Vaccine 1388442A Compared With Fluarix

NCT00693706
View directory record Official record
Conditions
Influenza
Interventions
Trivalent influenza vaccine GSK 138842A, Fluarix
Biological
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 49 Years
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
2
States / cities
Miami, Florida • Lenexa, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 8, 2018 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Comparison of One Versus Two Doses of Influenza Vaccine in Children 5-8 Years of Age

NCT00158665
View directory record Official record
Conditions
Influenza
Interventions
2 0.5 ml doses of '04-05 Trivalent Influenza Vaccine
Biological
Lead sponsor
Kaiser Permanente
Other
Eligibility
5 Years to 8 Years
Enrollment
280 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Oct 13, 2017 · Synced Oct 20, 2026, 2:55 AM EDT