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ClinicalTrials.gov public records Last synced Oct 11, 2026, 6:07 PM EDT

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

Showing 49–72 of 3,922 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Respiratory Tract Infections (RTI) Clear all
Withdrawn No phase listed Observational

Airway Inflammatory Response During Illness in Children With Respiratory Failure

NCT02047877
View directory record Official record
Conditions
Acute Respiratory Failure, Acute Respiratory Infection, Acute Respiratory Distress Syndrome
Interventions
Not listed
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
Up to 17 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 14, 2017 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Testing Multiple Behavioral Science Strategies to Increase Flu-Shot Rates at a Large Retail Pharmacy

NCT04590066
View directory record Official record
Conditions
Influenza, Human
Interventions
Flu shot text messages
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
734,383 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 11, 2026, 6:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Advance Care Planning: Communicating With Outpatients for Vital Informed Decision

NCT04660422
View directory record Official record
Conditions
Advanced Care Planning, Shared Decision Making, Video Decision Aids, Communication Skills, Advance Directives, Natural Language Processing, Covid19
Interventions
VitalTalk communication skills training, ACP Decisions Video Program, Intervention training:, Medical Record Review
Other
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
65 Years and older
Enrollment
42,019 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
New Hyde Park, New York
Source: ClinicalTrials.gov public record
Updated Jul 5, 2022 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Lot-to-Lot Consistency of V114 in Healthy Adults (V114-020)

NCT03950856
View directory record Official record
Conditions
Pneumococcal Infections, Pneumonia, Pneumococcal
Interventions
V114, Prevnar 13™
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
50 Years and older
Enrollment
2,340 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
30
States / cities
Chandler, Arizona • Mesa, Arizona • Fountain Valley, California + 26 more
Source: ClinicalTrials.gov public record
Updated Apr 12, 2021 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Evaluate Safety, Reactogenicity, and Immunogenicity of mRNA-1283 and mRNA-1273 Vaccines in Healthy Adults Between 18 Years and 55 Years of Age to Prevent COVID-19

NCT04813796
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1283, mRNA-1273, Placebo
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
104 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
5
States / cities
Chandler, Arizona • San Diego, California • Melbourne, Florida + 2 more
Source: ClinicalTrials.gov public record
Updated Aug 1, 2023 · Synced Oct 11, 2026, 6:07 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Safety and Immunogenicity of an Adjuvanted RSV Vaccine in Healthy Older Adults

NCT03572062
View directory record Official record
Conditions
Respiratory Tract Infection
Interventions
Formulation A, Formulation B, Formulation C, Placebo
Biological
Lead sponsor
Pfizer
Industry
Eligibility
65 Years to 85 Years
Enrollment
317 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
4
States / cities
South Miami, Florida • Peoria, Illinois • Fremont, Nebraska + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 26, 2021 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate Efficacy, Safety, and Immunogenicity of mRNA-1273 Vaccine in Adults Aged 18 Years and Older to Prevent COVID-19

NCT04470427
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273, Placebo
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
30,415 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
100
States / cities
Birmingham, Alabama • Chandler, Arizona • Glendale, Arizona + 79 more
Source: ClinicalTrials.gov public record
Updated Mar 21, 2024 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

COVID-19 Messaging for Vaccination

NCT05182554
View directory record Official record
Conditions
Vaccination Refusal, COVID-19 Pandemic
Interventions
Doctor Videos, Sharing Videos, Sharing Videos (Influencers), Vaccine Ambassador, Video framing, Video order
Behavioral
Lead sponsor
Massachusetts Institute of Technology
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Cambridge, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 25, 2023 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Not applicable Interventional

Seasonal Influenza Vaccination Reminders for Children With High-risk Conditions

NCT01431183
View directory record Official record
Conditions
Seasonal Influenza Vaccination
Interventions
Mailed influenza vaccination reminder notice
Behavioral
Lead sponsor
University of Michigan
Other
Eligibility
24 Months to 60 Months
Enrollment
3,618 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Sep 9, 2011 · Synced Oct 11, 2026, 6:07 PM 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 17, 2026 · Synced Oct 11, 2026, 6:07 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

VEText Message Framing and Covid-19 Vaccine Uptake Among at Risk Veterans

NCT04805931
View directory record Official record
Conditions
Covid19, Vaccine Refusal
Interventions
Behavioral economics
Behavioral
Lead sponsor
VA Puget Sound Health Care System
Federal
Eligibility
18 Years and older
Enrollment
4,311 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jun 28, 2021 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Effectiveness of the Pneumococcal Polysaccharide Vaccine in Military Recruits

NCT02079701
View directory record Official record
Conditions
Pneumonia, Acute Respiratory Disease
Interventions
23-valent pneumococcal vaccine, Placebo
Biological
Lead sponsor
Naval Health Research Center
Federal
Eligibility
Not listed
Enrollment
152,723 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2000 – 2007
U.S. locations
5
States / cities
San Diego, California • Great Lakes, Illinois • Fort Leonard Wood, Missouri + 2 more
Source: ClinicalTrials.gov public record
Updated Mar 6, 2014 · Synced Oct 11, 2026, 6:07 PM EDT
Completed No phase listed Observational

HostDx Sepsis in the Diagnosis and Prognosis of Emergency Department Patients With Suspected Infections: a Multicenter Pilot Study

NCT03744741
View directory record Official record
Conditions
Respiratory Tract Infections, Urinary Tract Infections, Skin and Soft Tissue Infections, Intraabdominal Infections, Sepsis
Interventions
HostDx Sepsis
Diagnostic Test
Lead sponsor
Inflammatix
Industry
Eligibility
18 Years and older
Enrollment
585 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
6
States / cities
Atlanta, Georgia • Lexington, Kentucky • Springfield, Massachusetts + 3 more
Source: ClinicalTrials.gov public record
Updated Dec 3, 2021 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Phase 1Phase 2 Interventional Results available

PVP-I Nasal Sprays and SARS-CoV-2 Nasopharyngeal Titers (for COVID-19)

NCT04347954
View directory record Official record
Conditions
COVID-19
Interventions
Povidone-Iodine 2%, Povidone-Iodine 0.5%, Isotonic saline 0.9%
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Oct 21, 2021 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Safety and Efficacy Study of Fluzone® Vaccine Combined With Different Doses of JVRS-100 Adjuvant

NCT00662272
View directory record Official record
Conditions
Influenza
Interventions
Fluzone vaccine with JVRS-100 adjuvant, Fluzone vaccine
Biological
Lead sponsor
Colby Pharmaceutical Company
Industry
Eligibility
18 Years to 49 Years
Enrollment
128 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
2
States / cities
Miami, Florida • Lenexa, Kansas
Source: ClinicalTrials.gov public record
Updated Mar 17, 2010 · Synced Oct 11, 2026, 6:07 PM EDT
Terminated No phase listed Observational

Cardiovascular Implications of COVID-19

NCT04435457
View directory record Official record
Conditions
SARS-CoV 2, SARS Pneumonia, COVID-19, SARS-Associated Coronavirus as Cause of Disease Classified Elsewhere, Cardiac Complication
Interventions
Not listed
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated May 23, 2023 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Not applicable Interventional

Long COVID-19 Syndrome Lifestyle Intervention Study

NCT05836402
View directory record Official record
Conditions
Long COVID-19 Syndrome
Interventions
Low carbohydrate diet intervention
Dietary Supplement
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Aug 7, 2025 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Phase 2 Interventional Results available

A Study to Understand the Effect and Safety of the Study Medicine PF-07817883 in Adults Who Have Symptoms of COVID-19 But Are Not Hospitalized

NCT05799495
View directory record Official record
Conditions
SARS-CoV-2 Infection
Interventions
PF-07817883, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 64 Years
Enrollment
240 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023
U.S. locations
53
States / cities
Cullman, Alabama • Phoenix, Arizona • Surprise, Arizona + 45 more
Source: ClinicalTrials.gov public record
Updated Oct 9, 2024 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Not applicable Interventional Results available

A Study of the GRIP Influenza and SARS-CoV-2 POC Assays

NCT05674370
View directory record Official record
Conditions
COVID-19, Influenza
Interventions
GRIP Electronic Diagnostic Chip, Laboratory-based nucleic acid amplification tests (NAATs)
Device · Diagnostic Test
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 21, 2024 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Study to Assess the Immunogenicity and Safety of an Investigational Influenza Vaccine in Children

NCT00980005
View directory record Official record
Conditions
Influenza
Interventions
GSK investigational vaccine GSK1557482A, Fluzone®
Biological
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
3 Years to 17 Years
Enrollment
2,116 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
28
States / cities
Birmingham, Alabama • Benton, Arkansas • Huntington Beach, California + 25 more
Source: ClinicalTrials.gov public record
Updated Sep 21, 2018 · Synced Oct 11, 2026, 6:07 PM EDT
Completed No phase listed Observational

Lung Injury Prediction Study

NCT00889772
View directory record Official record
Conditions
Respiratory Distress, Acute Lung Injury
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 24, 2015 · Synced Oct 11, 2026, 6:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Protecting Native Families From COVID-19

NCT04765475
View directory record Official record
Conditions
COVID-19
Interventions
Motivational Interviewing, COVID-19 Symptom Monitoring System, Motivational Interviewing and COVID-19 Symptom Monitoring System, Supportive Services
Behavioral · Other
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
18 Years and older
Enrollment
64 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Whiteriver, Arizona
Source: ClinicalTrials.gov public record
Updated Jul 18, 2022 · Synced Oct 11, 2026, 6:07 PM 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 8, 2019 · Synced Oct 11, 2026, 6:07 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 11, 2026, 6:07 PM EDT