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Showing 1–24 of 3,366 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Respiratory Viral Infections Clear all
Completed Phase 3 Interventional Accepts healthy volunteers

Study to Evaluate the Safety of a Bivalent Vaccine of New 6:2 Influenza Virus Reassortants in Healthy Adults

NCT00125944
View directory record Official record
Conditions
Healthy, Influenza
Interventions
FluMist
Biological
Lead sponsor
MedImmune LLC
Industry
Eligibility
18 Years to 49 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2006
U.S. locations
4
States / cities
San Diego, California • Daytona Beach, Florida • Portland, Oregon + 1 more
Source: ClinicalTrials.gov public record
Updated May 8, 2007 · Synced Jul 22, 2026, 3:33 AM EDT
Completed No phase listed Observational

Methodologies for Observational Studies Comparing Inpatient COVID-19 Treatments

NCT05638932
View directory record Official record
Conditions
COVID-19
Interventions
Initiation of IL6Ri (tocilizumab or sarilumab) versus JAKi (baricitinib or tofacitinib) added to systemic corticosteroids of interest (CSI)
Drug
Lead sponsor
Aetion, Inc.
Other
Eligibility
18 Years and older
Enrollment
1,442 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Jul 22, 2026, 3:33 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Using Mobile App on Perceived Stress During COVID-19 Pandemic

NCT04329533
View directory record Official record
Conditions
Perceived Stress, Anxiety, Sleep Disturbance
Interventions
"Calm" is a mindfulness meditation mobile app
Other
Lead sponsor
University of Arizona
Other
Eligibility
18 Years to 99 Years · Female only
Enrollment
101 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 12, 2020 · Synced Jul 22, 2026, 3:33 AM EDT
Completed Phase 2 Interventional

A Clinical Trial of KT07 Capsule in the U.S.A

NCT02867358
View directory record Official record
Conditions
Influenza, Human
Interventions
KT07 Capsule, Placebo
Drug · Other
Lead sponsor
Yiling Pharmaceutical Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
391 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
81
States / cities
Birmingham, Alabama • Pelham, Alabama • Tolleson, Arizona + 66 more
Source: ClinicalTrials.gov public record
Updated Aug 30, 2020 · Synced Jul 22, 2026, 3:33 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Spirulina Oral Supplement for Enhancing Host Resilience to Virus Infection

NCT05447078
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Immulina TM, Placebo
Drug · Dietary Supplement
Lead sponsor
University of Mississippi Medical Center
Other
Eligibility
18 Years and older
Enrollment
492 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Dec 25, 2025 · Synced Jul 22, 2026, 3:33 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Drug-Drug Interaction Study to Evaluate the Effects of Itraconazole, Carbamazepine, Quinidine and Fluconazole on the Pharmacokinetics and Safety of EDP-323.

NCT06847464
View directory record Official record
Conditions
RSV Infection, Drug Drug Interaction (DDI)
Interventions
EDP-323, Itraconazole, carbamazepine, Quinidine, fluconazole
Drug
Lead sponsor
Enanta Pharmaceuticals, Inc
Industry
Eligibility
18 Years to 65 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Jun 30, 2025 · Synced Jul 22, 2026, 3:33 AM 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 22, 2026, 3:33 AM EDT
Active, not recruiting Not applicable Interventional Results available

Home-based Brain Stimulation Treatment for Post-acute Sequelae of COVID-19 (PASC)

NCT05092516
View directory record Official record
Conditions
Dysexecutive Syndrome, Post-Acute Sequelae of COVID-19
Interventions
Active tDCS, Sham tDCS
Device
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Charlestown, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 16, 2026 · Synced Jul 22, 2026, 3:33 AM EDT
Terminated Phase 2 Interventional

INvestigating TELmisartin Study

NCT04715763
View directory record Official record
Conditions
Covid19
Interventions
Telmisartan Oral Product, Placebo
Drug
Lead sponsor
University of Hawaii
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Honolulu, Hawaii
Source: ClinicalTrials.gov public record
Updated Jun 30, 2022 · Synced Jul 22, 2026, 3:33 AM EDT
Withdrawn Phase 2 Interventional

Preventing Frequent Sinus Infections in HIV-Infected Patients

NCT00000752
View directory record Official record
Conditions
HIV Infections, Sinusitis
Interventions
Pseudoephedrine hydrochloride, Guaifenesin, Cefuroxime axetil, Beclomethasone dipropionate
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
12 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
Ends 1993
U.S. locations
10
States / cities
San Diego, California • San Francisco, California • The Bronx, New York + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 27, 2021 · Synced Jul 22, 2026, 3:33 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study on the Immune Response and Safety Elicited by a Vaccine Against Respiratory Syncytial Virus (RSV) When Given Alone and Together With a Vaccine Against Influenza in Adults Aged 65 Years and Above

NCT05559476
View directory record Official record
Conditions
Respiratory Syncytial Virus Infections
Interventions
RSVPreF3 OA investigational vaccine, FLU HD vaccine
Biological
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
65 Years and older
Enrollment
1,029 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
46
States / cities
Birmingham, Alabama • Tempe, Arizona • Canoga Park, California + 41 more
Source: ClinicalTrials.gov public record
Updated Sep 23, 2024 · Synced Jul 22, 2026, 3:33 AM EDT
Active, not recruiting No phase listed Observational

Long Term Outcomes of Patients With COVID-19

NCT04360538
View directory record Official record
Conditions
Critical Illness, Corona Virus Infection, Respiratory Failure, Covid-19
Interventions
Quality of Life, Impact Event Score, Hospital anxiety and depression scale
Other
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 12, 2026 · Synced Jul 22, 2026, 3:33 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 22, 2026, 3:33 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 22, 2026, 3:33 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 Jul 22, 2026, 3:33 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 22, 2026, 3:33 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Study to Evaluate the Safety, Tolerability, and Immunogenicity of an RNA Vaccine Candidate Against COVID-19 in Healthy Children

NCT04816643
View directory record Official record
Conditions
SARS-CoV-2 Infection, COVID-19
Interventions
Biological/Vaccine: BNT162b2 10mcg, BNT162b2 20mcg, BNT162b2 30mcg, Placebo, Biological/Vaccine: BNT162b2 3mcg
Biological · Other
Lead sponsor
BioNTech SE
Industry
Eligibility
6 Months to 15 Years
Enrollment
11,837 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
90
States / cities
Birmingham, Alabama • Phoenix, Arizona • Los Angeles, California + 67 more
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Jul 22, 2026, 3:33 AM EDT
Completed Not applicable Interventional

Telestroke at Comprehensive Stroke Center During the COVID-19 Pandemic

NCT04761874
View directory record Official record
Conditions
Stroke, Acute
Interventions
Telestroke
Other
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
296 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Edina, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 21, 2021 · Synced Jul 22, 2026, 3:33 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Universal Anti-Viral Vaccine for Healthy Elderly Adults

NCT04441047
View directory record Official record
Conditions
Virus Diseases, Pneumonia, COVID-19 Respiratory Infection, RSV Pneumonia, Influenza, Human, ARDS, Human
Interventions
AlloStim
Drug
Lead sponsor
Mirror Biologics, Inc.
Industry
Eligibility
65 Years and older
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
4
States / cities
Delray Beach, Florida • Miami, Florida • Tampa, Florida + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 13, 2025 · Synced Jul 22, 2026, 3:33 AM EDT
Recruiting Phase 2 Interventional

Convalescent Plasma as a Possible Treatment for COVID-19

NCT04442191
View directory record Official record
Conditions
COVID-19
Interventions
Convalescent plasma, Placebo
Biological
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
40 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 21, 2020 · Synced Jul 22, 2026, 3:33 AM EDT
Completed Phase 2 Interventional Results available

CRISIS2: A Phase 2 Study of the Safety and Antiviral Activity of Brequinar in Non-hospitalized Pts With COVID-19

NCT04575038
View directory record Official record
Conditions
COVID-19 Infection
Interventions
Brequinar, Placebo
Drug
Lead sponsor
Clear Creek Bio, Inc.
Industry
Eligibility
18 Years and older
Enrollment
115 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
14
States / cities
Homewood, Alabama • Long Beach, California • Doral, Florida + 11 more
Source: ClinicalTrials.gov public record
Updated Apr 18, 2022 · Synced Jul 22, 2026, 3:33 AM EDT
Completed No phase listed Observational

Determine the Prevalence and Severity of Asthma in HIV (Human Immunodeficiency Virus) Infected Patients

NCT02405026
View directory record Official record
Conditions
Asthma, HIV
Interventions
Not listed
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
83 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 2, 2017 · Synced Jul 22, 2026, 3:33 AM EDT
Completed Phase 3 Interventional Results available

Evaluating the Use of Pitavastatin to Reduce the Risk of Cardiovascular Disease in HIV-Infected Adults

NCT02344290
View directory record Official record
Conditions
HIV, Cardiovascular Diseases
Interventions
Pitavastatin, Placebo
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
40 Years to 75 Years
Enrollment
7,769 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2023
U.S. locations
91
States / cities
Birmingham, Alabama • Tucson, Arizona • Los Angeles, California + 59 more
Source: ClinicalTrials.gov public record
Updated Sep 3, 2025 · Synced Jul 22, 2026, 3:33 AM EDT
Withdrawn Not applicable Interventional

Double-Blind Randomized Placebo-Controlled Trial of a Proprietary Full Hemp Flower Formulation for Long COVID

NCT05467904
View directory record Official record
Conditions
Post-acute COVID-19 Syndrome
Interventions
Xltranplus, Xltran
Other
Lead sponsor
LUCINDA BATEMAN, MD
Other
Eligibility
18 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jul 16, 2025 · Synced Jul 22, 2026, 3:33 AM EDT