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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Respiratory Infections Clear all
Completed Phase 1 Interventional

Lithium Long COVID Dose-finding Study

NCT06108297
View directory record Official record
Conditions
Long COVID
Interventions
Lithium
Dietary Supplement
Lead sponsor
State University of New York at Buffalo
Other
Eligibility
18 Years to 80 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Williamsville, New York
Source: ClinicalTrials.gov public record
Updated Oct 21, 2024 · Synced Sep 17, 2026, 5:16 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Efficacy of N-Acetylcysteine (NAC) in Preventing COVID-19 From Progressing to Severe Disease

NCT04419025
View directory record Official record
Conditions
COVID, Sars-CoV2, SARS-Associated Coronavirus as Cause of Disease Classified Elsewhere, Oxidative Stress
Interventions
N-acetylcysteine
Drug
Lead sponsor
Cambridge Health Alliance
Other
Eligibility
18 Years and older
Enrollment
165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
4
States / cities
Cambridge, Massachusetts • Everett, Massachusetts • Somerville, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 27, 2021 · Synced Sep 17, 2026, 5:16 AM EDT
Completed Phase 2Phase 3 Interventional

COmbination Therapy With Baloxavir and Oseltamivir 1 for Hospitalized Patients With Influenza (The COMBO Trial 1)

NCT04327791
View directory record Official record
Conditions
Influenza
Interventions
Baloxavir, Placebos
Drug
Lead sponsor
Bassett Healthcare
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
3
States / cities
Springfield, Massachusetts • Cooperstown, New York • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 17, 2026, 5:16 AM EDT
Terminated Phase 2 Interventional Results available

COVID-19 and Anti-CD14 Treatment Trial

NCT04391309
View directory record Official record
Conditions
Coronavirus Disease 2019 (COVID-19), Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)
Interventions
anti-CD14, Placebo, remdesivir
Biological · Other · Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
5
States / cities
Sarasota, Florida • Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jun 25, 2023 · Synced Sep 17, 2026, 5:16 AM EDT
Completed No phase listed Observational

Real World Study of COVID-19 in a Flyover Region

NCT04962347
View directory record Official record
Conditions
Covid19
Interventions
Not listed
Lead sponsor
Tulane University
Other
Eligibility
18 Years to 120 Years
Enrollment
1,800 participants
Timeline
2021 – 2022
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated Oct 19, 2022 · Synced Sep 17, 2026, 5:16 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 24, 2014 · Synced Sep 17, 2026, 5:16 AM EDT
Withdrawn No phase listed Observational

Assessment of COVID-19 in Tearfilm

NCT04579458
View directory record Official record
Conditions
Covid19, Ophthalmopathy, Eye Diseases
Interventions
Collection of tears and saliva.
Procedure
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Feb 4, 2021 · Synced Sep 17, 2026, 5:16 AM EDT
Completed No phase listed Observational

Early Life Factors and Respiratory Health in Mexico City Children

NCT00342758
View directory record Official record
Conditions
Respiratory Ilness
Interventions
Not listed
Lead sponsor
National Institute of Environmental Health Sciences (NIEHS)
NIH
Eligibility
Not listed
Enrollment
6,800 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2007
U.S. locations
1
States / cities
Research Triangle Park, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 1, 2017 · Synced Sep 17, 2026, 5:16 AM EDT
Completed No phase listed Observational

Early Short Course Corticosteroids in COVID-19

NCT04374071
View directory record Official record
Conditions
COVID, Pneumonia, Viral
Interventions
Methylprednisolone
Drug
Lead sponsor
Henry Ford Health System
Other
Eligibility
18 Years and older
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated May 4, 2020 · Synced Sep 17, 2026, 5:16 AM EDT
Completed Phase 2 Interventional

Pulmonary and Cardiac Effects of E-Cigarette Use in Pulmonary Patients Who Smoke Cigarettes

NCT05610514
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease, Chronic Bronchitis, Emphysema, Asthma-COPD Overlap Syndrome
Interventions
E-Cigarette, Financial Incentives
Other · Behavioral
Lead sponsor
University of Vermont
Other
Eligibility
40 Years and older
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Feb 7, 2024 · Synced Sep 17, 2026, 5:16 AM EDT
Not yet recruiting Phase 1 Interventional Accepts healthy volunteers

Safety and Immunogenicity of Chimeric Hemagglutinin mRNA Vaccine Candidates

NCT07703514
View directory record Official record
Conditions
Influenza
Interventions
cH15/3, cH4/3, cH5/1N1, cH8/1N1, Saline
Biological · Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 59 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Sep 17, 2026, 5:16 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Discussing COVID-19 Vaccines in Private Facebook Groups

NCT05422898
View directory record Official record
Conditions
COVID-19
Interventions
Gist messages on COVID-19 vaccination, COVID-19 vaccine information
Behavioral
Lead sponsor
George Washington University
Other
Eligibility
18 Years and older
Enrollment
508 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Jun 20, 2022 · Synced Sep 17, 2026, 5:16 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Safety of 3 New 6:2 Influenza Virus Reassortants in Adults

NCT01579916
View directory record Official record
Conditions
Influenza
Interventions
Trivalent Influenza Virus Vaccine, Placebo
Biological · Other
Lead sponsor
MedImmune LLC
Industry
Eligibility
18 Years to 49 Years
Enrollment
303 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012
U.S. locations
3
States / cities
Miami, Florida • Stockbridge, Georgia • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Feb 2, 2014 · Synced Sep 17, 2026, 5:16 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

COVID-19 Vaccines International Pregnancy Exposure Registry

NCT04705116
View directory record Official record
Conditions
Covid19
Interventions
COVID-19 vaccine
Biological
Lead sponsor
Pregistry
Industry
Eligibility
18 Years to 50 Years · Female only
Enrollment
1,184 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jul 16, 2026 · Synced Sep 17, 2026, 5:16 AM EDT
Terminated Phase 2 Interventional

Ultramicronized Palmitoylethanolamide (PEA) Treatment in Hospitalized Participants With COVID-19

NCT04619706
View directory record Official record
Conditions
COVID-19
Interventions
FSD201, Placebo, Standard of Care for Covid-19
Drug · Other
Lead sponsor
Quantum Biopharma
Industry
Eligibility
18 Years and older
Enrollment
53 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
10
States / cities
Miami, Florida • St. Petersburg, Florida • Idaho Falls, Idaho + 6 more
Source: ClinicalTrials.gov public record
Updated Dec 4, 2022 · Synced Sep 17, 2026, 5:16 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Topical Antibacterial Agents for Prevention of COVID-19

NCT05449392
View directory record Official record
Conditions
COVID-19, SARS-CoV2 Infection
Interventions
Neosporin, Vaseline
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
18 Years to 60 Years
Enrollment
67 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Oct 2, 2023 · Synced Sep 17, 2026, 5:16 AM EDT
Terminated Phase 2 Interventional Results available

Early Methicillin-resistant Staphylococcus Aureus (MRSA) Therapy in Cystic Fibrosis (CF)

NCT01349192
View directory record Official record
Conditions
Cystic Fibrosis, Methicillin-resistant Staphylococcus Aureus
Interventions
Rifampin, Trimethoprim/Sulfamethoxazole, Minocycline, Mupirocin, chlorhexidine gluconate oral rinse, 2% Chlorhexidine solution wipes, Environmental Decontamination
Drug · Behavioral
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
4 Years to 45 Years
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
13
States / cities
Birmingham, Alabama • Aurora, Colorado • Gainesville, Florida + 9 more
Source: ClinicalTrials.gov public record
Updated May 14, 2017 · Synced Sep 17, 2026, 5:16 AM EDT
Completed Phase 4 Interventional Results available

Hypertonic Saline for Acute Bronchiolitis

NCT01247064
View directory record Official record
Conditions
Bronchiolitis, Viral, Saline Solution, Hypertonic
Interventions
Nebulized 3% saline, Nebulized 0.9% Normal Saline
Drug
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
2 Months to 23 Months
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 18, 2014 · Synced Sep 17, 2026, 5:16 AM EDT
Active, not recruiting Phase 2 Interventional

Sodium Citrate in Smell Retraining for People With Post-COVID-19 Olfactory Dysfunction

NCT06204432
View directory record Official record
Conditions
Long Haul COVID-19, Post-Acute COVID-19 Syndrome, Anosmia, Olfaction Disorders
Interventions
Sodium Citrate, Normal Saline, Olfactory Training Kit - "The Olfactory Kit, by AdvancedRx"
Drug · Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 19, 2025 · Synced Sep 17, 2026, 5:16 AM EDT
Completed Phase 2 Interventional

Phase 2B Study on Safety and Therapeutic Efficacy of DAS181 in Adult Subjects With Naturally Acquired Influenza

NCT01740063
View directory record Official record
Conditions
Influenza
Interventions
DAS181-F02 formulation, DAS181-F04 formulation, Placebo
Drug
Lead sponsor
Ansun Biopharma, Inc.
Industry
Eligibility
18 Years to 70 Years
Enrollment
423 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Jul 7, 2019 · Synced Sep 17, 2026, 5:16 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Measuring the Influence of Kefir on Children's Stools on Antibiotics (MILK)

NCT00481507
View directory record Official record
Conditions
Respiratory Tract Infections
Interventions
Kefir, Placebo
Other
Lead sponsor
Georgetown University
Other
Eligibility
1 Year to 5 Years
Enrollment
125 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Jul 9, 2019 · Synced Sep 17, 2026, 5:16 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Best Practices to Prevent COVID-19 Illness in Staff and People With Serious Mental Illness and Developmental Disabilities in Congregate Living Settings

NCT04726371
View directory record Official record
Conditions
Intellectual Disability, Developmental Disability, Axis I Diagnosis, Mental Illness, Covid19, Coronavirus
Interventions
Generic Best Practices, Tailored Best Practices
Behavioral
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
415 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 11, 2025 · Synced Sep 17, 2026, 5:16 AM EDT
Active, not recruiting Not applicable Interventional

A Study of Healthy Microbiome, Healthy Mind

NCT06020703
View directory record Official record
Conditions
Critical Illness, COVID-19, PICS, Cognitive Impairment, Mental Health Impairment, Weakness, Muscle, Dysbiosis
Interventions
Fermented Food Diet
Behavioral
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 2, 2026 · Synced Sep 17, 2026, 5:16 AM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers Results available

Dose Ranging Trial to Assess Safety and Immunogenicity of V590 (COVID-19 Vaccine) in Healthy Adults (V590-001)

NCT04569786
View directory record Official record
Conditions
Coronavirus Disease (COVID-19)
Interventions
V590, Placebo
Biological · Other
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years and older
Enrollment
232 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
7
States / cities
Tempe, Arizona • Miami, Florida • South Miami, Florida + 4 more
Source: ClinicalTrials.gov public record
Updated Dec 28, 2021 · Synced Sep 17, 2026, 5:16 AM EDT