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Showing 1–24 of 261 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Influenza, Vaccination Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Almonds on Immune Strength and Response to Flu Vaccination in Overweight Older Men and Postmenopausal Women: A Randomized Controlled Study

NCT05031663
View directory record Official record
Conditions
Immune Response, Inflammation
Interventions
Almond group, Control Group
Dietary Supplement
Lead sponsor
Loma Linda University
Other
Eligibility
40 Years to 70 Years
Enrollment
61 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Loma Linda, California
Source: ClinicalTrials.gov public record
Updated Dec 8, 2025 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Comparative Tests of Flu Vaccination Phone Messages

NCT03332992
View directory record Official record
Conditions
Influenza, Human
Interventions
Viral changes, Protect others, General intentions, Behavioral intentions, Accountability
Behavioral
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
7,206 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 14, 2018 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Immunogenicity and Safety Study of Inactivated Subunit H5N1 Influenza Vaccine in Prior Recipients of Live Attenuated H2N2, H6N1 and H9N2 Influenza Vaccines and in H5N1 and Live Attenuated Vaccine Naïve Individuals

NCT03816878
View directory record Official record
Conditions
Influenza
Interventions
H5N1 pISV
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 60 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 21, 2025 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Early Immune Responses to Inactivated Influenza Vaccine: a Pilot Study

NCT01522248
View directory record Official record
Conditions
Influenza Virus Vaccine
Interventions
Trivalent Inactivated Influenza vaccine
Biological
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
18 Years to 50 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 14, 2019 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Not applicable Interventional Results available

Behavioral Economics to Improve Flu Vaccination Using EHR Nudges Replication

NCT06626321
View directory record Official record
Conditions
Behavior, Health, Flu, Flu Vaccination
Interventions
Pre-visit patient text messaging, Default pended order, Monthly peer comparison feedback, High risk bidirectional pre-visit text messaging
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
50 Years and older
Enrollment
26,248 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Lancaster, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 29, 2026 · Synced Jul 21, 2026, 12:32 PM EDT
Completed No phase listed Observational

Influenza Vaccine in HIV Infection: Immune Response and Effect on Viral Load

NCT00025922
View directory record Official record
Conditions
HIV Infection
Interventions
Not listed
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
Not listed
Enrollment
240 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2003
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Jul 21, 2026, 12:32 PM EDT
Recruiting No phase listed Observational

Natural History of Systemic and Nasal Mucosal Immunity to Influenza and SARS-CoV-2 in Adults After Vaccination

NCT04794829
View directory record Official record
Conditions
Influenza, COVID-19
Interventions
Not listed
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 120 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 7, 2026 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Safety of RIV4 Versus IIV4 in Pregnant Women

NCT03969641
View directory record Official record
Conditions
Safety, Adverse Event Following Immunisation, Birth Outcomes
Interventions
Quadrivalent Recombinant Influenza Vaccine, Quadrivalent Inactivated Influenza Vaccine
Biological
Lead sponsor
Duke University
Other
Eligibility
18 Years and older · Female only
Enrollment
384 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
3
States / cities
Boston, Massachusetts • Durham, North Carolina • Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 10, 2023 · Synced Jul 21, 2026, 12:32 PM 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 16, 2026 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Not applicable Interventional Results available

The Effect of Fact Versus Myth Messages on Receipt of Influenza Vaccination

NCT01009645
View directory record Official record
Conditions
Influenza Vaccination
Interventions
Fact Only Education Message, Fact and Myth Educational Message, Fact, Myth, Why Educational Message, Control Educational Message
Behavioral
Lead sponsor
Northwestern University
Other
Eligibility
50 Years and older
Enrollment
125 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Oct 29, 2023 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Beta-glucan and Immune Response to Influenza Vaccine

NCT05074303
View directory record Official record
Conditions
Healthy Aging
Interventions
Influenza Vaccine, Beta-glucan, Placebo
Biological · Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
50 Years to 100 Years
Enrollment
78 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Nov 5, 2025 · Synced Jul 21, 2026, 12:32 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Analysis of Bone Marrow and Blood B Cell Immune Responses to Influenza Vaccination

NCT02485639
View directory record Official record
Conditions
Influenza, Influenza Immunisation
Interventions
Influenza Virus Vaccine Inactivated
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 49 Years
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2020
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Oct 23, 2023 · Synced Jul 21, 2026, 12:32 PM EDT
Not listed Phase 4 Interventional Accepts healthy volunteers

Effect of Influenza Vaccination on Donor Egg Recipient Outcomes

NCT02946177
View directory record Official record
Conditions
Infertility, Recurrent Miscarriage
Interventions
Influenza Vaccine, Sterile Saline
Biological · Other
Lead sponsor
Center for Human Reproduction
Other
Eligibility
21 Years to 45 Years · Female only
Enrollment
126 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 17, 2020 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

2013/2017 H7N9 Prime-Boost Interval

NCT03589807
View directory record Official record
Conditions
Avian Influenza, Influenza Immunisation
Interventions
A/H7N9, AS03, Influenza Virus Vaccine, Monovalent A/H7N9 A/Shanghai/2/2013, Phosphate Buffered Saline (PBS) diluent
Biological · Drug · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
19 Years to 50 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
6
States / cities
Atlanta, Georgia • Decatur, Georgia • Iowa City, Iowa + 3 more
Source: ClinicalTrials.gov public record
Updated Aug 1, 2021 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Building Engagement Using Financial Incentives Trial - Colorectal Cancer Screening

NCT06124131
View directory record Official record
Conditions
Health Behavior, Colorectal Cancer, Influenza, COVID-19, Vaccine Hesitancy, Vaccine-Preventable Diseases, Healthcare Patient Acceptance
Interventions
Financial incentive for colorectal cancer screening, Financial incentive for flu shot, Financial incentive for COVID-19 shot
Behavioral
Lead sponsor
Tulane University
Other
Eligibility
45 Years to 75 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated May 3, 2025 · Synced Jul 21, 2026, 12:32 PM EDT
Not listed Phase 4 Interventional Accepts healthy volunteers

Recombinant Influenza Vaccination in U.S. Nursing Homes

NCT03965195
View directory record Official record
Conditions
Influenza, Influenza -Like Illness, Influenza, Human
Interventions
Recombinant Influenza Vaccine, Standard Dose Quadrivalent Influenza Vaccine
Biological
Lead sponsor
Insight Therapeutics, LLC
Other
Eligibility
18 Years to 120 Years
Enrollment
1,989 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2023
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 14, 2023 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Not applicable Interventional Results available

Patient Portal Reminder/Recall for Influenza Vaccination in a Health System- RCT 2

NCT04110314
View directory record Official record
Conditions
Influenza, Respiratory Tract Infections
Interventions
Portal Reminders for Influenza Vaccination: Gain-framed, Portal Reminders for Influenza Vaccination: Loss-framed, Pre-commitment prompt
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
4 Months and older
Enrollment
430,636 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated May 4, 2022 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Fever After Simultaneous Versus Sequential Vaccination in Young Children

NCT03165981
View directory record Official record
Conditions
Fever After Vaccination, Fever, Febrile Seizure
Interventions
PCV13, DTaP, IIV
Biological
Lead sponsor
Duke University
Other
Eligibility
12 Months to 16 Months
Enrollment
221 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
3
States / cities
Oakland, California • Atlanta, Georgia • Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 17, 2024 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Not applicable Interventional

The Effect of a Planning Prompt on Seasonal Influenza Vaccination Rates

NCT01207232
View directory record Official record
Conditions
Seasonal Influenza
Interventions
Planning Prompt, Control Condition
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
3,272 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 21, 2010 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessment, Feedback, Incentive, Exchange (AFIX OB) A Customizable Quality Improvement Intervention to Increase Maternal Vaccine Uptake

NCT04678271
View directory record Official record
Conditions
Influenza, Whooping Cough
Interventions
AFIX-OB Quality Improvement Package
Behavioral
Lead sponsor
Yale University
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
202 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Sep 20, 2023 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Phase 4 Interventional Results available

H1N1 Influenza Vaccine Immunogenicity in HIV-1 Infected Patients

NCT01111162
View directory record Official record
Conditions
HIV Infections
Interventions
H1N1 vaccination
Biological
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 11, 2016 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Systems Biological Assessment of Statin Effect on Vaccine Responses

NCT06024096
View directory record Official record
Conditions
Vaccine Response
Interventions
Atorvastatin, Quadrivalent seasonal influenza vaccine
Drug · Biological
Lead sponsor
Emory University
Other
Eligibility
18 Years to 50 Years
Enrollment
63 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jan 13, 2026 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Not applicable Interventional

Text4Vax: Text Message Reminders for Pediatric COVID-19 and Influenza Vaccines 2024-25 Season

NCT06603090
View directory record Official record
Conditions
Influenza, COVID-19, Vaccination Hesitancy
Interventions
Text message influenza vaccine reminders, Text message COVID-19 vaccine reminders, Text message influenza and COVID-19 vaccine reminders
Behavioral
Lead sponsor
Columbia University
Other
Eligibility
6 Months to 17 Years
Enrollment
66,147 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
4
States / cities
Itasca, Illinois • New York, New York • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 10, 2025 · Synced Jul 21, 2026, 12:32 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Annual Study for Collection of Serum Samples in Children and Older Adults Receiving the 2020-2021 Formulations of Fluzone Quadrivalent Vaccine and Fluzone High-Dose Quadrivalent Vaccine, Respectively

NCT04551677
View directory record Official record
Conditions
Influenza Immunization, Healthy Volunteers
Interventions
Fluzone Quadrivalent vaccine, No Preservative (0.5-mL dose), 2020-2021 formulation, Fluzone High-Dose Quadrivalent vaccine (0.7-mL dose), 2020-2021 formulation
Biological
Lead sponsor
Sanofi Pasteur, a Sanofi Company
Industry
Eligibility
6 Months to 84 Years
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
2
States / cities
Bardstown, Kentucky • Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Sep 11, 2025 · Synced Jul 21, 2026, 12:32 PM EDT