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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Lower Respiratory Tract Infection (LRTI) Clear all
Terminated Not applicable Interventional Results available

Placebo-Controlled Trial of Antibiotic Therapy in Adults With Suspect Lower Respiratory Tract Infection (LRTI) and a Procalcitonin Level

NCT03341273
View directory record Official record
Conditions
Lower Respiratory Tract Infection
Interventions
Azithromycin, Placebo, VIDAS B.R.A.H.M.S Procalcitonin Test (PCT)
Drug · Other · Device
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 99 Years
Enrollment
514 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
5
States / cities
Atlanta, Georgia • Decatur, Georgia • Durham, North Carolina + 1 more
Source: ClinicalTrials.gov public record
Updated Jun 27, 2023 · Synced Jul 23, 2026, 4:15 PM EDT
Not listed Phase 2 Interventional Accepts healthy volunteers

NAC for Attenuation of COVID-19 Symptomatology

NCT05074121
View directory record Official record
Conditions
Covid19, COVID-19 Pneumonia, COVID-19 Respiratory Infection, COVID-19 Lower Respiratory Infection, SARS-CoV2 Infection, SARS-CoV-2 Acute Respiratory Disease, SARS-Associated Coronavirus as Cause of Disease Classified Elsewhere, Oxidative Stress
Interventions
N-acetylcysteine, Placebo
Drug · Other
Lead sponsor
Cambridge Health Alliance
Other
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Everett, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 6, 2023 · Synced Jul 23, 2026, 4:15 PM EDT
Completed No phase listed Observational

A Retrospective Study of COVID-19 Treatments

NCT04949230
View directory record Official record
Conditions
Covid19, COVID-19 Pneumonia, COVID-19 Respiratory Infection, COVID-19 Acute Bronchitis, COVID-19 Acute Respiratory Distress Syndrome, COVID-19 Lower Respiratory Infection, SARS-CoV2 Infection, SARS-CoV-2 Acute Respiratory Disease
Interventions
No Intervention Used
Other
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Months and older
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Feb 28, 2024 · Synced Jul 23, 2026, 4:15 PM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Grasshopper: a Novel Clinical Dashboard for Radiologists

NCT06785246
View directory record Official record
Conditions
Chest Infection, Pulmonary Edema - Acute
Interventions
Grasshopper dashboard
Other
Lead sponsor
Kaiser Permanente
Other
Eligibility
Not listed
Enrollment
100,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Pleasanton, California
Source: ClinicalTrials.gov public record
Updated Jan 20, 2025 · Synced Jul 23, 2026, 4:15 PM EDT
Completed Not applicable Interventional Results available

Procalcitonin Antibiotic Consensus Trial (ProACT)

NCT02130986
View directory record Official record
Conditions
Lower Respiratory Tract Infection (LRTI)
Interventions
Procalcitonin level, Results of procalcitonin (PCT) level to treating clinician, Provide procalcitonin guideline to treating clinician, Telephone Visit
Other
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years and older
Enrollment
1,664 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
13
States / cities
Birmingham, Alabama • Phoenix, Arizona • Orange, California + 8 more
Source: ClinicalTrials.gov public record
Updated Jan 14, 2019 · Synced Jul 23, 2026, 4:15 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

The Rhinovirus Hospitalization and Investigation of Nasal-airway Omics (RHINO) Study

NCT07342582
View directory record Official record
Conditions
Rhinovirus
Interventions
Nasal Swab Healthy Surveillance, Nasal Swab Sick Samples, Nasal Swab Hospitalized Cohort, Sick Follow-up Survey, Older Cohort Control Group, Procedural Comfort or Care
Diagnostic Test · Other
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
Up to 17 Years
Enrollment
670 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2030
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 22, 2026 · Synced Jul 23, 2026, 4:15 PM EDT
Completed Phase 3 Interventional Results available

A Trial to Reduce Pneumonia in Nursing Home Residents

NCT00975780
View directory record Official record
Conditions
Pneumonia, Lower Respiratory Tract Infection
Interventions
Enhanced Oral Care, Usual oral care
Other
Lead sponsor
Yale University
Other
Eligibility
65 Years and older
Enrollment
834 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 19, 2014 · Synced Jul 23, 2026, 4:15 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Phase 1 Study of BLB-201 Vaccine in Healthy Young and Older Adults

NCT05281263
View directory record Official record
Conditions
Respiratory Syncytial Virus Infections
Interventions
CPI-RSV-F Vaccine (BLB-201)
Biological
Lead sponsor
Blue Lake Biotechnology Inc.
Industry
Eligibility
18 Years to 75 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
2
States / cities
Cincinnati, Ohio • North Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Dec 20, 2023 · Synced Jul 23, 2026, 4:15 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Flublok v. Standard Dose Vaccine Effectiveness Among Kaiser Permanente Northern California Adults 18-64 Years

NCT03694392
View directory record Official record
Conditions
Influenza, Pneumonia, Lower Respiratory Tract Infection, Acute Myocardial Infarction, Congestive Heart Failure, Stroke
Interventions
Flublok Quadrivalent, Standard Dose Inactivated Influenza Vaccine (SD-IIV)
Biological
Lead sponsor
Kaiser Permanente
Other
Eligibility
18 Years to 64 Years
Enrollment
2,776,278 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2022
U.S. locations
1
States / cities
Oakland, California
Source: ClinicalTrials.gov public record
Updated Apr 7, 2025 · Synced Jul 23, 2026, 4:15 PM EDT
Completed Phase 2 Interventional Results available

Presatovir in Hematopoietic Cell Transplant Recipients With Respiratory Syncytial Virus (RSV) Infection of the Lower Respiratory Tract

NCT02254421
View directory record Official record
Conditions
Respiratory Syncytial Virus Infection
Interventions
Presatovir, Placebo
Drug
Lead sponsor
Gilead Sciences
Industry
Eligibility
18 Years to 75 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
11
States / cities
Duarte, California • Chicago, Illinois • Baltimore, Maryland + 8 more
Source: ClinicalTrials.gov public record
Updated Sep 23, 2018 · Synced Jul 23, 2026, 4:15 PM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

Exhaled Nitric Oxide Levels in Infants and Young Children Infected With RSV or Other Viral Infections

NCT01098227
View directory record Official record
Conditions
Bronchiolitis, Infection, Nitric Oxide
Interventions
Not listed
Lead sponsor
NYU Langone Health
Other
Eligibility
Up to 4 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Mar 15, 2020 · Synced Jul 23, 2026, 4:15 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Exhaled Nitric Oxide in Respiratory Syncytial Virus (RSV) Bronchiolitis: a Pilot Study

NCT01090557
View directory record Official record
Conditions
RSV Infection, Bronchiolitis
Interventions
Collection of exhaled breath
Other
Lead sponsor
Winthrop University Hospital
Other
Eligibility
1 Day to 4 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Mar 21, 2010 · Synced Jul 23, 2026, 4:15 PM EDT
Active, not recruiting No phase listed Observational

A Study to Learn How Effective is PCV20 to Help Stop Adults Who Have a Higher Chance of Getting Pneumonia

NCT07251465
View directory record Official record
Conditions
Pneumonia
Interventions
Receipt of PCV20
Biological
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
846,279 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 21, 2026 · Synced Jul 23, 2026, 4:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

A Prospective, Epidemiological Study to Assess the Disease Burden of Respiratory Syncytial Virus Associated, Suspected Lower Respiratory Tract Infections in Newborns, From 0 to 2 Years of Age and Risk of Development of Wheeze and Asthma From 0 to 6 Years of Age

NCT01995175
View directory record Official record
Conditions
Respiratory Syncytial Virus
Interventions
Nasal swab sampling, Blood sampling, Diary cards
Procedure · Other
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
Up to 6 Years
Enrollment
2,409 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2021
U.S. locations
9
States / cities
Oakland, California • Sacramento, California • Santa Clara, California + 5 more
Source: ClinicalTrials.gov public record
Updated Nov 28, 2022 · Synced Jul 23, 2026, 4:15 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Safety and Efficacy of MEDI8897 for the Prevention of Medically Attended RSV LRTI in Healthy Preterm Infants.

NCT02878330
View directory record Official record
Conditions
Respiratory Syncytial Virus Infections
Interventions
MEDI8897, Placebo
Drug
Lead sponsor
MedImmune LLC
Industry
Eligibility
Up to 365 Days
Enrollment
1,453 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
60
States / cities
Birmingham, Alabama • Anaheim, California • Downey, California + 53 more
Source: ClinicalTrials.gov public record
Updated Oct 13, 2019 · Synced Jul 23, 2026, 4:15 PM EDT
Active, not recruiting No phase listed Observational

A Study to Learn About ABRYSVO Vaccine in Older Adults to Prevent Severe Respiratory Syncytial Virus (RSV) Disease

NCT06077968
View directory record Official record
Conditions
Respiratory Syncytial Viruses
Interventions
Prior standard of care receipt of Pfizer's ABRYSVO vaccine
Biological
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 10, 2026 · Synced Jul 23, 2026, 4:15 PM EDT
Completed No phase listed Observational

Study to Evaluate the Incidence of Hospitalizations and Respiratory Tract Infections in Premature Infants

NCT00384462
View directory record Official record
Conditions
Respiratory Syncytial Virus Infections
Interventions
Not listed
Lead sponsor
MedImmune LLC
Industry
Eligibility
1 Month to 6 Months
Enrollment
346 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
59
States / cities
Birmingham, Alabama • Benton, Arkansas • Jonesboro, Arkansas + 50 more
Source: ClinicalTrials.gov public record
Updated Feb 3, 2009 · Synced Jul 23, 2026, 4:15 PM EDT
Completed Phase 2 Interventional Results available

A Study of SYN-004 for the Prevention of C.Diff in Patients With a LRTI

NCT02563106
View directory record Official record
Conditions
Clostridium Difficile, Clostridium Infections
Interventions
SYN-004, Placebo
Drug
Lead sponsor
Theriva Biologics, Inc.
Industry
Eligibility
50 Years and older
Enrollment
413 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
6
States / cities
Little Rock, Arkansas • Torrance, California • DeLand, Florida + 3 more
Source: ClinicalTrials.gov public record
Updated Nov 26, 2018 · Synced Jul 23, 2026, 4:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Osteopathic Manipulative Therapy Effects on Prolonged Post-COVID Olfactory Dysfunction

NCT05112887
View directory record Official record
Conditions
COVID-19 Lower Respiratory Infection, SARS-CoV2 Infection
Interventions
Osteopathic Manipulative Therapy
Other
Lead sponsor
Ohio University
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Dublin, Ohio
Source: ClinicalTrials.gov public record
Updated Nov 8, 2021 · Synced Jul 23, 2026, 4:15 PM EDT
Enrolling by invitation No phase listed Observational

Study on Home Obstructive Respiratory Exacerbations

NCT06544928
View directory record Official record
Conditions
COPD Exacerbation, COPD (Chronic Obstructive Pulmonary Disease) With Acute Lower Respiratory Infection, COPD Exacerbation Acute, COPD
Interventions
RESP™ Biosensor
Device
Lead sponsor
Strados Labs, Inc.
Industry
Eligibility
40 Years to 80 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 19, 2026 · Synced Jul 23, 2026, 4:15 PM EDT
Terminated Phase 1 Interventional Results available

A Study to Learn About the Amount of the Study Medicine (Sisunatovir) in Blood and Its Safety in Infants and Children With Pneumonia Caused by RSV

NCT06102174
View directory record Official record
Conditions
Respiratory Syncytial Virus Infections
Interventions
Placebo, Active
Drug
Lead sponsor
Pfizer
Industry
Eligibility
1 Day to 60 Months
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
3
States / cities
Los Angeles, California • St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 29, 2025 · Synced Jul 23, 2026, 4:15 PM EDT
Recruiting Not applicable Interventional

Reducing Overuse of Antibiotics With Decision Support

NCT06788093
View directory record Official record
Conditions
Lower Respiratory Tract Infection, Pneumonia, Asthma, Bronchiolitis, Viral
Interventions
ED Clinical Decision Support (CDS-ED), Transitions Clinical Decision Support (CDS-Tr)
Behavioral
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
6 Months to 17 Years
Enrollment
2,800 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
3
States / cities
Oakland, California • San Francisco, California • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 21, 2026 · Synced Jul 23, 2026, 4:15 PM EDT
Completed No phase listed Observational

Trimethoprim-Sulfamethoxazole vs Levofloxacin as Targeted Therapy for Stenotrophomonas Maltophilia Infections: a Retrospective Cohort Study

NCT04639817
View directory record Official record
Conditions
Stenotrophomonas Infection
Interventions
Levofloxacin, trimethoprim-sulfamethoxazole
Drug
Lead sponsor
National Institutes of Health Clinical Center (CC)
NIH
Eligibility
18 Years and older
Enrollment
1,621 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 27, 2021 · Synced Jul 23, 2026, 4:15 PM EDT
Completed Not applicable Interventional

C-reactive Protein (CRP)-Guided Management Algorithm for Adults With Acute Cough

NCT00221351
View directory record Official record
Conditions
Cough
Interventions
CRP point of care testing
Procedure
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
139 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2006
U.S. locations
2
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated May 22, 2011 · Synced Jul 23, 2026, 4:15 PM EDT