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ClinicalTrials.gov public records Last synced Oct 13, 2026, 5:14 PM EDT

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

Showing 121–144 of 3,924 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Respiratory Tract Infections (RTI) Clear all
Completed No phase listed Observational Accepts healthy volunteers

COVID-19 Testing Sample Acquisition Throughput and Efficiency

NCT04532411
View directory record Official record
Conditions
SARS-CoV Infection, Respiratory Viral Infection, Personal Protective Equipment, Covid19
Interventions
Personal Protective Testing Booth
Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
Not listed
Enrollment
28,948 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 23, 2023 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Study of MK-4482 for Prevention of Coronavirus Disease 2019 (COVID-19) in Adults (MK-4482-013)

NCT04939428
View directory record Official record
Conditions
Coronavirus Disease (COVID-19)
Interventions
Molnupiravir, Placebo
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years and older
Enrollment
2,441 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
59
States / cities
Birmingham, Alabama • Mesa, Arizona • Tucson, Arizona + 53 more
Source: ClinicalTrials.gov public record
Updated Sep 26, 2024 · Synced Oct 13, 2026, 5:14 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Classification of COVID-19 Infection in Posteroanterior Chest X-rays

NCT04358536
View directory record Official record
Conditions
COVID-19
Interventions
CovX
Device
Lead sponsor
Dascena
Industry
Eligibility
18 Years and older
Enrollment
230 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Oakland, California
Source: ClinicalTrials.gov public record
Updated Apr 24, 2020 · Synced Oct 13, 2026, 5:14 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

Development of Immune Globulin Treatment for Avian Flu

NCT00383071
View directory record Official record
Conditions
Infectious Diseases, Influenza, Avian Flu
Interventions
H5N1 vaccine, Apheresis
Biological · Procedure
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 59 Years
Enrollment
126 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2014
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 31, 2018 · Synced Oct 13, 2026, 5:14 PM EDT
Recruiting Not applicable Interventional

Evaluation of Pulsed Field Ablation of the Posterior Nasal Nerve for Chronic Rhinitis

NCT06598319
View directory record Official record
Conditions
Chronic Rhinitis
Interventions
NOVOCLEAR™ Device
Device
Lead sponsor
Aventix Medical Inc.
Industry
Eligibility
18 Years to 85 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
3
States / cities
Colorado Springs, Colorado • Ocean Springs, Mississippi • San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Apr 30, 2026 · Synced Oct 13, 2026, 5:14 PM EDT
Active, not recruiting Phase 3 Interventional Accepts healthy volunteers

A Clinical Study to Evaluate the Safety, Tolerability, and Immunogenicity of VAX-31 With Influenza Vaccine in Adults ≥ 50 Years of Age

NCT07365826
View directory record Official record
Conditions
Pneumococcal Vaccines
Interventions
31-valent pneumococcal conjugate vaccine, Seasonal Influenza Vaccine (SIV) (Flublok), Placebo
Biological
Lead sponsor
Vaxcyte, Inc.
Industry
Eligibility
50 Years and older
Enrollment
1,390 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
25
States / cities
Phoenix, Arizona • Fort Collins, Colorado • DeLand, Florida + 22 more
Source: ClinicalTrials.gov public record
Updated Jun 30, 2026 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Phase 3 Interventional Results available

Phase III Double-blind, Placebo-controlled Study of AZD7442 for Pre-exposure Prophylaxis of COVID-19 in Adult.

NCT04625725
View directory record Official record
Conditions
COVID-19
Interventions
AZD7442, Placebo
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 120 Years
Enrollment
5,197 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
60
States / cities
Birmingham, Alabama • Tempe, Arizona • Little Rock, Arkansas + 53 more
Source: ClinicalTrials.gov public record
Updated Dec 31, 2024 · Synced Oct 13, 2026, 5:14 PM EDT
Withdrawn Phase 1 Interventional

Mesenchymal Stromal Cells for COVID-19 and Viral Pneumonias

NCT05286255
View directory record Official record
Conditions
COVID-19 Pneumonia, Viral Pneumonia
Interventions
Allogeneic Mesenchymal Stromal Cells
Biological
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 80 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Oct 30, 2024 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Not applicable Interventional Results available

The Respiratory Protection Effectiveness Clinical Trial

NCT01249625
View directory record Official record
Conditions
Influenza, Respiratory Syncytial Viruses, Paramyxoviridae Infections, Coronavirus, Rhinovirus
Interventions
N95 Respirator, Medical/surgical mask
Device
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 100 Years
Enrollment
2,862 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2018
U.S. locations
7
States / cities
Aurora, Colorado • Denver, Colorado • Washington D.C., District of Columbia + 3 more
Source: ClinicalTrials.gov public record
Updated Apr 25, 2019 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug-Drug Interaction Study Between EDP-235, Midazolam, Caffeine and Rosuvastatin in Healthy Subjects

NCT05594615
View directory record Official record
Conditions
COVID-19
Interventions
EDP-235, Midazolam, Rosuvastatin, Caffeine
Drug
Lead sponsor
Enanta Pharmaceuticals, Inc
Industry
Eligibility
18 Years to 55 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Apr 27, 2023 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Preliminary Efficacy of a One-Session Mindfulness Telehealth Intervention for Loneliness

NCT04414826
View directory record Official record
Conditions
Loneliness
Interventions
Mindfulness Alone (MO) Intervention, Mindfulness + Compassion Intervention (MC)
Behavioral
Lead sponsor
University of Texas at Austin
Other
Eligibility
18 Years to 70 Years
Enrollment
91 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Jun 1, 2022 · Synced Oct 13, 2026, 5:14 PM EDT
Terminated Phase 3 Interventional

Inhaled Nitric Oxide for Preterm Infants With Severe Respiratory Failure

NCT00016523
View directory record Official record
Conditions
Infant, Newborn, Infant, Low Birth Weight, Infant, Small for Gestational Age, Infant, Premature, Respiratory Distress Syndrome (RDS), Sepsis, Pneumonia, Hypertension, Pulmonary
Interventions
Inhaled nitric oxide, Placebo
Drug
Lead sponsor
NICHD Neonatal Research Network
Network
Eligibility
Up to 120 Hours
Enrollment
420 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2006
U.S. locations
17
States / cities
Birmingham, Alabama • Palo Alto, California • San Diego, California + 14 more
Source: ClinicalTrials.gov public record
Updated Sep 26, 2017 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

FLU-VACS Comparative Study in Adults

NCT00133523
View directory record Official record
Conditions
Influenza
Interventions
Cold-adapted live attenuated influenza virus vaccine, trivalent, Placebo, Trivalent inactivated influenza vaccine
Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 49 Years
Enrollment
2,349 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2007
U.S. locations
6
States / cities
Ann Arbor, Michigan • Kalamazoo, Michigan • Livonia, Michigan + 2 more
Source: ClinicalTrials.gov public record
Updated Dec 5, 2014 · Synced Oct 13, 2026, 5:14 PM EDT
Withdrawn Phase 3 Interventional Accepts healthy volunteers

A Study to Evaluate the Efficacy of Xlear vs. Placebo for Acute COVID-19 Infection

NCT04858620
View directory record Official record
Conditions
Covid19
Interventions
Xlear Nasal Spray, Placebo
Drug
Lead sponsor
Larkin Community Hospital
Other
Eligibility
18 Years to 90 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Oct 16, 2023 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Not applicable Interventional Results available

RADx-UP Phase 3D (Oregon Saludable: Juntos Podemos)

NCT05910879
View directory record Official record
Conditions
Health Behavior, Health Care Utilization, Vaccine Hesitancy
Interventions
Self-Affirmation Implementation Intentions (SAII) Intervention, Promotores de Salud (Health Education)
Behavioral
Lead sponsor
University of Oregon
Other
Eligibility
18 Years and older
Enrollment
625 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Aug 12, 2026 · Synced Oct 13, 2026, 5:14 PM EDT
Completed No phase listed Observational

Asthma Phenotypes in the Inner City

NCT01383941
View directory record Official record
Conditions
Asthma, Rhinitis
Interventions
Guidelines-based asthma and rhinitis/rhinosinusitis therapy
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
6 Years to 17 Years
Enrollment
717 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
9
States / cities
Denver, Colorado • Washington D.C., District of Columbia • Chicago, Illinois + 6 more
Source: ClinicalTrials.gov public record
Updated Mar 16, 2017 · Synced Oct 13, 2026, 5:14 PM EDT
Withdrawn Phase 1 Interventional

A Study of RLS-0071 in Patients With Acute Lung Injury Due to COVID-19 Pneumonia in Early Respiratory Failure

NCT04574869
View directory record Official record
Conditions
Acute Lung Injury, ALI, COVID-19
Interventions
RLS-0071 10 mg/kg, RLS-0071 40 mg/kg, Placebo
Drug
Lead sponsor
ReAlta Life Sciences, Inc.
Industry
Eligibility
18 Years to 69 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Feb 4, 2022 · Synced Oct 13, 2026, 5:14 PM EDT
Terminated Phase 2 Interventional Results available

Tocilizumab for Prevention of Respiratory Failure in Patients With Severe COVID-19 Infection

NCT04377659
View directory record Official record
Conditions
COVID-19
Interventions
Tocilizumab
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 28, 2025 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

The Celljuvant Study: A Phase 3 Immunogenicity and Safety Study of aQIVc Vaccine in Adults Aged 50 Years and Older

NCT06015282
View directory record Official record
Conditions
Influenza, Human
Interventions
Investigational aQIVc, licensed QIVr, licensed aQIV
Biological
Lead sponsor
Seqirus
Industry
Eligibility
50 Years and older
Enrollment
7,741 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
51
States / cities
Tempe, Arizona • Little Rock, Arkansas • Huntington Beach, California + 47 more
Source: ClinicalTrials.gov public record
Updated Apr 27, 2025 · Synced Oct 13, 2026, 5:14 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

Positron Emission Tomography (PET) Imaging of Thrombosis

NCT03830320
View directory record Official record
Conditions
Atrial Fibrillation, COVID-19, Cancer, Thrombosis
Interventions
[64Cu]FBP8, PET/MR, Blood Collection, Electrocardiogram
Drug · Device · Procedure
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 85 Years
Enrollment
165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 27, 2026 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of a N95 Respirator vs Cloth Mask on Exercise Capacity During Treadmill Exercise.

NCT04415879
View directory record Official record
Conditions
COVID-19
Interventions
N-95 Respirator, Cloth Face Mask
Other
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 11, 2025 · Synced Oct 13, 2026, 5:14 PM EDT
Not listed Not applicable Interventional

UNITE Study (UCSD-SW) for COVID-19

NCT04803409
View directory record Official record
Conditions
Covid19
Interventions
Splenic Ultrasound
Device
Lead sponsor
Imanuel Lerman
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Dec 10, 2021 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Safety, Tolerability and Immunogenicity of a Plant-made Seasonal Quadrivalent VLP Influenza Vaccine in Adults

NCT01991587
View directory record Official record
Conditions
Virus Diseases, RNA Virus Infections, Respiratory Tract Diseases, Respiratory Tract Infections
Interventions
Low dose of quadrivalent VLP vaccine, Medium dose of quadrivalent VLP vaccine, High dose of quadrivalent VLP vaccine, Placebo
Biological
Lead sponsor
Medicago
Industry
Eligibility
18 Years to 49 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jun 11, 2020 · Synced Oct 13, 2026, 5:14 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Trial to Evaluate the Efficacy and Safety of RSVpreF in Infants Born to Women Vaccinated During Pregnancy.

NCT04424316
View directory record Official record
Conditions
Respiratory Tract Infection
Interventions
RSVpreF, Placebo
Biological
Lead sponsor
Pfizer
Industry
Eligibility
0 Years to 49 Years · Female only
Enrollment
14,727 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
363
States / cities
Birmingham, Alabama • Cullman, Alabama • Mobile, Alabama + 137 more
Source: ClinicalTrials.gov public record
Updated Feb 11, 2025 · Synced Oct 13, 2026, 5:14 PM EDT