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Showing 1–24 of 688 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Immunization; Infection Clear all
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, 10:55 AM 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, 10:55 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Community Network-driven COVID-19 Testing and Vaccination of Vulnerable Populations in the Central US

NCT04743908
View directory record Official record
Conditions
Covid19
Interventions
Social Network Strategy + COVID-19 messaging
Other
Lead sponsor
University of Chicago
Other
Eligibility
15 Years and older
Enrollment
1,328 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Oct 9, 2024 · Synced Jul 21, 2026, 10:55 AM 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, 10:55 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Vouchers to Promote Tdap Vaccination

NCT01860378
View directory record Official record
Conditions
Whooping Cough
Interventions
Full price, $5 off
Other
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
18 Years and older
Enrollment
149 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 2, 2015 · Synced Jul 21, 2026, 10:55 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

COVID-19 Vaccination Using a 2nd Generation (E1/E2B/E3-Deleted) Adenoviral-COVID-19 in Normal Healthy Volunteers

NCT04591717
View directory record Official record
Conditions
COVID-19
Interventions
hAd5-S-Fusion+N-ETSD vaccine
Biological
Lead sponsor
ImmunityBio, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
2
States / cities
El Segundo, California • Newport Beach, California
Source: ClinicalTrials.gov public record
Updated Feb 27, 2023 · Synced Jul 21, 2026, 10:55 AM EDT
Completed No phase listed Observational

Effects of Therapeutic HIV Vaccination on Control of HIV After Discontinuation of Anti-HIV Drugs

NCT00050063
View directory record Official record
Conditions
HIV Infections
Interventions
Therapeutic vaccinations from A5058s
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
78 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Ends 2004
U.S. locations
14
States / cities
Torrance, California • Aurora, Colorado • Indianapolis, Indiana + 5 more
Source: ClinicalTrials.gov public record
Updated Oct 31, 2021 · Synced Jul 21, 2026, 10:55 AM 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, 10:55 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Project IMPACT Immunizations (IMProving America's Communities Together) Scaled Demonstration

NCT03372967
View directory record Official record
Conditions
Influenza
Interventions
Vaccine administration by a pharmacist, Unmet vaccination needs identified and met, Vaccination forecast review and patient education
Biological · Behavioral
Lead sponsor
American Pharmacists Association Foundation
Other
Eligibility
18 Years and older
Enrollment
6,234 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
22
States / cities
Atlantic, Iowa • Carlisle, Iowa • Coralville, Iowa + 18 more
Source: ClinicalTrials.gov public record
Updated Dec 12, 2019 · Synced Jul 21, 2026, 10:55 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Interventions to Increase HBV Vaccinations in Sexually Transmitted Disease (STD) Clinics

NCT00739752
View directory record Official record
Conditions
Hepatitis B Virus
Interventions
Non-Framed-Offered, Non-Framed-Recommended, Gain-Framed-Offered, Gain-Framed-Recommended, Loss-Framed-Offered, Loss-Framed-Recommended
Behavioral
Lead sponsor
Indiana University
Other
Eligibility
18 Years and older
Enrollment
1,747 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2007
U.S. locations
2
States / cities
Chicago, Illinois • Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Nov 8, 2018 · Synced Jul 21, 2026, 10:55 AM EDT
Completed No phase listed Observational

COVID-19 Antibody Levels After Vaccines

NCT04944134
View directory record Official record
Conditions
Vaccine Preventable Disease
Interventions
COVID-19 Vaccination
Biological
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years and older
Enrollment
71 participants
Timeline
2021 – 2022
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 31, 2022 · Synced Jul 21, 2026, 10:55 AM 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, 10:55 AM 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, 10:55 AM 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, 10:55 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 16, 2026 · Synced Jul 21, 2026, 10:55 AM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

Induced Blood-Stage Malaria in Healthy Malaria-Naive Adults to Assess the Safety and Infectivity of Plasmodium Vivax Challenge Agent and Evaluate Transmission in Mosquito Feeding Assays

NCT06607003
View directory record Official record
Conditions
Malaria
Interventions
P. vivax challenge agent derived from PvHMB-CCE001
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 54 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 29, 2026 · Synced Jul 21, 2026, 10:55 AM 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, 10:55 AM 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, 10:55 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Safety and Immunogenicity Trial of an Oral SARS-CoV-2 Vaccine (VXA-CoV2-1) for Prevention of COVID-19 in Healthy Adults and Boost (VXA-CoV2-1.1-S) at 1 Year Post Initial Vaccination in Subset of Subjects

NCT04563702
View directory record Official record
Conditions
Covid19
Interventions
VXA-CoV2-1
Biological
Lead sponsor
Vaxart
Industry
Eligibility
18 Years to 54 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Cypress, California
Source: ClinicalTrials.gov public record
Updated Jun 20, 2024 · Synced Jul 21, 2026, 10:55 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluating a Community-Led COVID-19 Testing Intervention to Address Mistrust - Study 1

NCT06650462
View directory record Official record
Conditions
COVID-19, Trust
Interventions
Community-led discussion
Behavioral
Lead sponsor
Old Dominion University
Other
Eligibility
18 Years and older
Enrollment
57 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 26, 2026 · Synced Jul 21, 2026, 10:55 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Evaluation of a Single Vaccination With a 4-Antigen Staphylococcus Aureus Vaccine (SA4Ag) in Healthy Adults Aged 18 to <65 Years

NCT02364596
View directory record Official record
Conditions
Staphylococcal Infections
Interventions
SA4Ag vaccine, Blood sample
Biological · Procedure
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 64 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
2
States / cities
Hollywood, Florida • South Miami, Florida
Source: ClinicalTrials.gov public record
Updated Apr 2, 2015 · Synced Jul 21, 2026, 10:55 AM 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, 10:55 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Safety Study of Hepatitis E Vaccine (HEV239)

NCT03827395
View directory record Official record
Conditions
Hepatitis E, Immunisation
Interventions
HEV 239, Placebo
Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 45 Years
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Sep 23, 2021 · Synced Jul 21, 2026, 10:55 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

VAX-MOM COVID-19: Increasing Maternal COVID-19 Vaccination

NCT05570630
View directory record Official record
Conditions
Immunization; Infection, Pregnancy Related, COVID-19
Interventions
VAX-MOM COVID-19 Intervention, Standard of Care
Behavioral · Other
Lead sponsor
University of Rochester
Other
Eligibility
Female only
Enrollment
6,911 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Sep 3, 2025 · Synced Jul 21, 2026, 10:55 AM EDT