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ClinicalTrials.gov public records Last synced Oct 16, 2026, 9:17 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 793–816 of 3,928 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Respiratory Tract Infections (RTI) Clear all
Completed Not applicable Interventional

Evaluation of the Interaction Between Low Dose Sulfamethoxazole-Trimethoprim and Zidovudine

NCT00000732
View directory record Official record
Conditions
HIV Infections
Interventions
Sulfamethoxazole-Trimethoprim, Zidovudine
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 50 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Ends 1990
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 3, 2021 · Synced Oct 16, 2026, 9:17 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 5, 2022 · Synced Oct 16, 2026, 9:17 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Repeated Employee Testing for Understanding Our Recovery to Normal

NCT04472793
View directory record Official record
Conditions
COVID-19
Interventions
SARS-CoV-2
Diagnostic Test
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
18 Years and older
Enrollment
236 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 17, 2025 · Synced Oct 16, 2026, 9:17 AM EDT
Completed No phase listed Observational

An Observational Study of Patients With Coronavirus Disease 2019

NCT04331886
View directory record Official record
Conditions
COVID-19, Coronavirus
Interventions
Not listed
Lead sponsor
Target PharmaSolutions, Inc.
Industry
Eligibility
18 Years and older
Enrollment
199 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Dec 17, 2025 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Not applicable Interventional

A Study to Evaluate the Effects of Azithromycin on MAC Disease Prevention in HIV-Positive Patients

NCT00000947
View directory record Official record
Conditions
Mycobacterium Avium-intracellulare Infection, HIV Infections
Interventions
Azithromycin
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
13 Years and older
Enrollment
850 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Ends 2000
U.S. locations
19
States / cities
San Francisco, California • Denver, Colorado • Washington D.C., District of Columbia + 11 more
Source: ClinicalTrials.gov public record
Updated Nov 3, 2021 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Phase 3 Interventional Results available

Short Term Relief of Eustachian Tube Dysfunction and Serous Otitis Media Using Intranasal Steroid Sprays

NCT00279916
View directory record Official record
Conditions
Otitis Media, Serous, Negative Middle Ear Pressure, Rhinitis, Otitis Media With Effusion, Otitis Media, Secretory
Interventions
Triamcinolone acetonide nasal spray, Placebo nasal spray
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
6 Years to 100 Years
Enrollment
91 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 30, 2017 · Synced Oct 16, 2026, 9:17 AM EDT
Completed No phase listed Observational

Arrhythmic Manifestations and Management in Hospitalized COVID-19 Patients

NCT04465552
View directory record Official record
Conditions
Coronavirus Infections
Interventions
Patients received standard of care treatment during hospitalization
Other
Lead sponsor
Kansas City Heart Rhythm Research Foundation
Other
Eligibility
18 Years and older
Enrollment
666 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated Sep 20, 2021 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Dose Exploration Intramuscular/Intravenous Prophylaxis Pharmacokinetic Exposure Response Study

NCT05872958
View directory record Official record
Conditions
COVID-19
Interventions
AZD3152, Placebo
Drug · Other
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 55 Years
Enrollment
98 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
4
States / cities
Anniston, Alabama • Cullman, Alabama • Scottsdale, Arizona + 1 more
Source: ClinicalTrials.gov public record
Updated Jun 6, 2025 · Synced Oct 16, 2026, 9:17 AM EDT
Terminated Phase 1 Interventional Results available

Camostat With Bicalutamide for COVID-19

NCT04652765
View directory record Official record
Conditions
Covid19, SARS-CoV Infection, Coronavirus Infection
Interventions
Camostat Mesilate, Bicalutamide 150 mg
Drug
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
60 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 6, 2023 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Phase 4 Interventional

Adjuvanted Influenza Vaccination in U.S. Nursing Homes

NCT02882100
View directory record Official record
Conditions
Influenza, Influenza-like Illness
Interventions
adjuvanted trivalent influenza vaccine, trivalent influenza vaccine
Biological
Lead sponsor
Insight Therapeutics, LLC
Other
Eligibility
65 Years and older
Enrollment
823 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2023
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 15, 2023 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Phase 3 Interventional Results available

Convalescent Plasma in Outpatients With COVID-19

NCT04355767
View directory record Official record
Conditions
Covid19
Interventions
Convalescent Plasma, Saline
Biological
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
511 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
53
States / cities
Chandler, Arizona • Phoenix, Arizona • La Jolla, California + 41 more
Source: ClinicalTrials.gov public record
Updated Oct 19, 2021 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Phase 2 Interventional Results available

Comparing the Efficacy, Safety, and Tolerability of Combination Antivirals (Amantadine, Ribavirin, Oseltamivir) Versus Oseltamivir for the Treatment of Influenza in Adults at Risk for Complications

NCT01227967
View directory record Official record
Conditions
Influenza
Interventions
Amantadine, Ribavirin, Oseltamivir, Oseltamivir
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
881 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2017
U.S. locations
69
States / cities
Birmingham, Alabama • Chandler, Arizona • Glendale, Arizona + 58 more
Source: ClinicalTrials.gov public record
Updated Feb 4, 2019 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Phase 3 Interventional Results available

Study of Obeldesivir in Nonhospitalized Participants With COVID-19

NCT05715528
View directory record Official record
Conditions
COVID-19
Interventions
Obeldesivir, Obeldesivir Placebo
Drug
Lead sponsor
Gilead Sciences
Industry
Eligibility
12 Years to 64 Years
Enrollment
2,011 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
108
States / cities
Alabaster, Alabama • Chandler, Arizona • Tucson, Arizona + 60 more
Source: ClinicalTrials.gov public record
Updated Dec 24, 2024 · Synced Oct 16, 2026, 9:17 AM EDT
Withdrawn Not applicable Interventional

Probiotic Use in Patients With Prior COPD Exacerbation

NCT02185092
View directory record Official record
Conditions
COPD, Obstructive Lung Disease
Interventions
Lactobacillus GG, Sugar pill
Dietary Supplement · Other
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years to 99 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated May 23, 2017 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Not applicable Interventional

Simultaneously Implementing Pathways for Improving Asthma, Pneumonia, and Bronchiolitis Care for Hospitalized Children

NCT05206695
View directory record Official record
Conditions
Asthma, Pneumonia, Bronchiolitis
Interventions
Multi-condition Pathway Intervention
Behavioral
Lead sponsor
University of California, San Francisco
Other
Eligibility
Up to 17 Years
Enrollment
11,760 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Apr 20, 2026 · Synced Oct 16, 2026, 9:17 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 10, 2019 · Synced Oct 16, 2026, 9:17 AM EDT
Terminated No phase listed Observational

The Effect of Levocetirizine on Inflammatory Mediators in Dermatographism

NCT01008592
View directory record Official record
Conditions
Rhinitis, Urticaria
Interventions
levocetirizine or placebo
Drug
Lead sponsor
Wake Forest University
Other
Eligibility
18 Years to 60 Years
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 28, 2017 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Adjuvanted Seasonal Recombinant Quadrivalent Virus-Like Particles (QVLP) Influenza Vaccine in Adults 65 Years of Age and Older

NCT04622592
View directory record Official record
Conditions
Influenza
Interventions
Instramuscular vaccine
Biological
Lead sponsor
Medicago
Industry
Eligibility
65 Years and older
Enrollment
209 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
14
States / cities
Huntsville, Alabama • Chandler, Arizona • San Diego, California + 11 more
Source: ClinicalTrials.gov public record
Updated Jul 21, 2023 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Phase 2 Interventional

A Study of Quintuple Therapy to Treat COVID-19 Infection

NCT04334512
View directory record Official record
Conditions
COVID-19, Corona Virus Infection, Coronavirus-19, Sars-CoV2
Interventions
Hydroxychloroquine, Azithromycin, Vitamin C, Vitamin D, Zinc
Drug · Dietary Supplement
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
Enrollment
118 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Feb 29, 2024 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Evaluation of Alternative Oseltamivir (Tamiflu) Dosing Strategies.

NCT00304434
View directory record Official record
Conditions
Influenza
Interventions
Oseltamivir, Probenecid
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2007
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated Sep 23, 2009 · Synced Oct 16, 2026, 9:17 AM EDT
Completed No phase listed Observational

Prevalence and Pathogenesis of Lung Disease in a Large HIV Cohort-coordinating Center

NCT00870857
View directory record Official record
Conditions
HIV Infections, Emphysema, Chronic Obstructive Pulmonary Disease, Pneumocystis
Interventions
Not listed
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years and older
Enrollment
407 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2016
U.S. locations
2
States / cities
Los Angeles, California • San Francisco, California
Source: ClinicalTrials.gov public record
Updated Aug 26, 2025 · Synced Oct 16, 2026, 9:17 AM EDT
Recruiting Phase 2 Interventional

Effect of 2-HOBA in Persistent Immune Activation in Long COVID POTS

NCT07189936
View directory record Official record
Conditions
Post-Acute COVID-19 Syndrome, Postural Tachycardia Syndrome (POTS), SARS CoV 2 Infection, Long COVID19
Interventions
To Measure levels of circulating monocyte/ T cell doublets at Baseline, To measure levels of circulating monocyte/ T cell doublets after 28 days of 2 HOBA treatment, To measure levels of circulating monocyte/ T cell doublets after 28 days of Placebo treatment, To Measure Splanchnic venous capacitance after 28 days of Treatment with 2HOBA, To Measure Splanchnic venous capacitance after 28 days of Treatment with Placebo, To Measure Orthostatic Tachycardia after 28 days of Treatment with 2HOBA, To Measure Orthostatic Tachycardia after 28 days of Treatment with Placebo
Drug · Diagnostic Test
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2029
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 22, 2026 · Synced Oct 16, 2026, 9:17 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Study on the Incidence of Influenza and Its Complications, in Subjects Aged 50 Years and Over Vaccinated With Fluarix™

NCT00377611
View directory record Official record
Conditions
Influenza
Interventions
Fluarix™
Biological
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
50 Years and older
Enrollment
3,054 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2007
U.S. locations
9
States / cities
Mobile, Alabama • Delray Beach, Florida • Pembroke Pines, Florida + 6 more
Source: ClinicalTrials.gov public record
Updated Oct 9, 2018 · Synced Oct 16, 2026, 9:17 AM EDT
Not listed No phase listed Observational Accepts healthy volunteers

The Measurement of Chemicals in Exhaled Breath Can Identify If a Person is Infected with COVID-19

NCT06571136
View directory record Official record
Conditions
COVID-19
Interventions
Not listed
Lead sponsor
N5 Sensors
Industry
Eligibility
18 Years to 70 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Everett, Washington
Source: ClinicalTrials.gov public record
Updated Nov 20, 2024 · Synced Oct 16, 2026, 9:17 AM EDT