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ClinicalTrials.gov public records Last synced Oct 11, 2026, 12:51 PM EDT

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Showing 73–96 of 130 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: COVID-19 (Prevention) Clear all
Withdrawn Phase 2 Interventional

Prevention of COVID-19 Infection to Severe Pneumonia or ARDS

NCT04569227
View directory record Official record
Conditions
Covid19 Pneumonia
Interventions
EC-18, Placebo
Drug
Lead sponsor
Enzychem Lifesciences Corporation
Industry
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
2
States / cities
The Bronx, New York • Warwick, Rhode Island
Source: ClinicalTrials.gov public record
Updated Aug 20, 2026 · Synced Oct 11, 2026, 12:51 PM EDT
Active, not recruiting Phase 4 Interventional Accepts healthy volunteers

Vitamin D Supplementation in the Prevention and Mitigation of COVID-19 Infection

NCT04482673
View directory record Official record
Conditions
COVID-19, Vitamin D Deficiency, Respiratory Viral Infection
Interventions
Daily Vitamin D3, Daily placebo, Bolus vitamin D3, Bolus placebo
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
50 Years and older
Enrollment
95 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Feb 24, 2023 · Synced Oct 11, 2026, 12:51 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Hydroxychloroquine in the Prevention of COVID-19 Infection in Healthcare Workers

NCT04333225
View directory record Official record
Conditions
COVID-19
Interventions
Hydroxychloroquine
Drug
Lead sponsor
Baylor Research Institute
Other
Eligibility
18 Years to 75 Years
Enrollment
221 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Aug 20, 2021 · Synced Oct 11, 2026, 12:51 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

A Randomized, Double-Blind, Single Center, Efficacy and Safety Study of Allogeneic HB-adMSCs Against COVID-19.

NCT04348435
View directory record Official record
Conditions
COVID-19
Interventions
HB-adMSCs, Placebos
Biological · Other
Lead sponsor
Hope Biosciences Research Foundation
Industry
Eligibility
Not listed
Enrollment
53 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Sugar Land, Texas
Source: ClinicalTrials.gov public record
Updated Sep 26, 2025 · Synced Oct 11, 2026, 12:51 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study of Ad26.COV2.S for the Prevention of SARS-CoV-2-Mediated COVID-19 in Adult Participants

NCT04505722
View directory record Official record
Conditions
Participants With or Without Stable Co-morbidities Associated With Progression to Severe COVID-19 at Different Stages of the Protocol
Interventions
Ad26.COV2.S, Placebo
Biological · Other
Lead sponsor
Janssen Vaccines & Prevention B.V.
Industry
Eligibility
18 Years and older
Enrollment
44,325 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
117
States / cities
Birmingham, Alabama • Huntsville, Alabama • Glendale, Arizona + 77 more
Source: ClinicalTrials.gov public record
Updated Feb 4, 2025 · Synced Oct 11, 2026, 12:51 PM EDT
Active, not recruiting Phase 2Phase 3 Interventional

Assessing the Efficacy of Sirolimus in Patients With COVID-19 Pneumonia for Prevention of Post-COVID Fibrosis

NCT04948203
View directory record Official record
Conditions
Pulmonary Fibrosis, COVID-19 Pneumonia, Long COVID
Interventions
Sirolimus
Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 15, 2025 · Synced Oct 11, 2026, 12:51 PM EDT
Not listed Phase 3 Interventional Accepts healthy volunteers

HEalth Care Worker pROphylaxis Against COVID-19: The HERO Trial

NCT04352946
View directory record Official record
Conditions
Prophylaxis, COVID-19, Health Care Worker, Hydroxychloroquine
Interventions
Hydroxychloroquine Pre-Exposure Prophylaxis, Placebo oral tablet
Drug
Lead sponsor
GeoSentinel Foundation
Other
Eligibility
18 Years and older
Enrollment
374 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 22, 2020 · Synced Oct 11, 2026, 12:51 PM EDT
Terminated Phase 3 Interventional Results available

Trial to Evaluate the Efficacy and Safety of Nitazoxanide (NTZ) for Post-Exposure Prophylaxis of COVID-19 and Other Viral Respiratory Illnesses in Elderly Residents of Long-Term Care Facilities (LTCF)

NCT04343248
View directory record Official record
Conditions
COVID-19, Viral Respiratory Illnesses
Interventions
Nitazoxanide, Placebo, Vitamin Super B-Complex
Drug · Dietary Supplement
Lead sponsor
Romark Laboratories L.C.
Industry
Eligibility
55 Years to 120 Years
Enrollment
190 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
4
States / cities
Kissimmee, Florida • Acworth, Georgia • Lake Charles, Louisiana + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 8, 2024 · Synced Oct 11, 2026, 12:51 PM EDT
Not listed Phase 4 Interventional Accepts healthy volunteers

Polio Vaccine (IPV) for SARS-CoV-2 and Prevention of Coronavirus Disease (COVID-19)

NCT04639375
View directory record Official record
Conditions
SARS-CoV-2
Interventions
Vaccinated with polio vaccine (IPV)
Biological
Lead sponsor
E-MO Biology Inc
Industry
Eligibility
18 Years to 80 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
National City, California
Source: ClinicalTrials.gov public record
Updated Aug 27, 2021 · Synced Oct 11, 2026, 12:51 PM EDT
Active, not recruiting Phase 3 Interventional Accepts healthy volunteers

Study of VYD2311 for the Prevention of COVID-19

NCT07298434
View directory record Official record
Conditions
COVID-19
Interventions
VYD2311-SD, VYD2311-MD, Placebo
Drug
Lead sponsor
Invivyd, Inc.
Industry
Eligibility
12 Years to 100 Years
Enrollment
1,770 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
20
States / cities
Long Beach, California • San Diego, California • Orlando, Florida + 17 more
Source: ClinicalTrials.gov public record
Updated Jun 10, 2026 · Synced Oct 11, 2026, 12:51 PM EDT
Terminated Phase 2 Interventional Results available

ACTION ON COVID-19: A Study to Test Whether BI 764198 Helps Lung Health of People Hospitalised With COVID-19

NCT04604184
View directory record Official record
Conditions
COVID-19
Interventions
BI 764198, Placebo
Drug
Lead sponsor
Boehringer Ingelheim
Industry
Eligibility
50 Years and older
Enrollment
133 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
7
States / cities
Orange, California • Alexandria, Louisiana • Boston, Massachusetts + 4 more
Source: ClinicalTrials.gov public record
Updated Apr 11, 2022 · Synced Oct 11, 2026, 12:51 PM EDT
Not listed Phase 3 Interventional Accepts healthy volunteers

A Phase 3 Randomized Double Blind Efficacy and Safety Study of Oral Polio Vaccine and NA-831 for Covid-19

NCT04540185
View directory record Official record
Conditions
Covid19, SARS (Severe Acute Respiratory Syndrome), SARS-CoV Infection, SARS-CoV-2
Interventions
Biological: oral polio vaccine, Comparable Placebo, NA-831, Comparable Placebo of drug, Combination of oral polio vaccine and NA-831, Comparable Placebo of Oral Polio Vaccine and Placebo of drug
Biological · Drug · Combination Product
Lead sponsor
Biomed Industries, Inc.
Industry
Eligibility
18 Years and older
Enrollment
3,600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
8
States / cities
Los Angeles, California • Orange, California • Palo Alto, California + 4 more
Source: ClinicalTrials.gov public record
Updated Sep 9, 2020 · Synced Oct 11, 2026, 12:51 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessment of N-95 Facemask for Use in COVID-19 Pandemic in Case of Shortage of Personal Protective Equipment

NCT04416919
View directory record Official record
Conditions
Coronavirus Infection, Disease Prevention
Interventions
Assembled mask
Other
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Mar 8, 2024 · Synced Oct 11, 2026, 12:51 PM EDT
Terminated Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Hydroxychloroquine Post Exposure Prophylaxis for Coronavirus Disease (COVID-19)

NCT04318444
View directory record Official record
Conditions
COVID-19, Corona Virus Infection
Interventions
Hydroxychloroquine, Placebo oral tablet
Drug
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 25, 2024 · Synced Oct 11, 2026, 12:51 PM EDT
Completed Phase 2 Interventional Results available

Prevention of Severe SARS-CoV-2 Infection in Hospitalized Patients With COVID-19

NCT04530136
View directory record Official record
Conditions
Confirmed Coronavirus Disease
Interventions
Ruconest
Drug
Lead sponsor
Pharming Technologies B.V.
Industry
Eligibility
18 Years to 85 Years
Enrollment
38 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
4
States / cities
Marlton, New Jersey • Mount Holly, New Jersey • Ridgewood, New Jersey + 1 more
Source: ClinicalTrials.gov public record
Updated Feb 16, 2024 · Synced Oct 11, 2026, 12:51 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

COVID-19: Povidone-Iodine Intranasal Prophylaxis in Front-line Healthcare Personnel and Inpatients

NCT04364802
View directory record Official record
Conditions
COVID-19, SARS-CoV 2
Interventions
Povidone-Iodine Nasal Spray and Gargle
Drug
Lead sponsor
Nikita Gupta
Other
Eligibility
18 Years to 99 Years
Enrollment
98 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Dec 2, 2022 · Synced Oct 11, 2026, 12:51 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

NO Prevention of COVID-19 for Healthcare Providers

NCT04312243
View directory record Official record
Conditions
Coronavirus Infections, Healthcare Associated Infection
Interventions
Inhaled nitric oxide gas
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 99 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 20, 2026 · Synced Oct 11, 2026, 12:51 PM EDT
Enrolling by invitation Not applicable Interventional

Patient-Centered Practical Vaccine Talk For Busy Clinicians

NCT07651761
View directory record Official record
Conditions
Influenza, COVID-19
Interventions
Provider communication training
Other
Lead sponsor
University of Massachusetts, Worcester
Other
Eligibility
18 Years and older
Enrollment
24,500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 29, 2026 · Synced Oct 11, 2026, 12:51 PM EDT
Not listed No phase listed Observational

Improving Cancer Screening and Prevention During the COVID-19 Pandemic in Underserved Populations of Rhode Island

NCT04587258
View directory record Official record
Conditions
Breast Cancer, Colorectal Cancer, Covid19
Interventions
Informational videos and social media campaigns encouraging cancer screening.
Behavioral
Lead sponsor
Rhode Island Hospital
Other
Eligibility
18 Years and older
Enrollment
100 participants
Timeline
2020 – 2022
U.S. locations
1
States / cities
Pawtucket, Rhode Island
Source: ClinicalTrials.gov public record
Updated Oct 14, 2020 · Synced Oct 11, 2026, 12:51 PM EDT
Terminated Phase 3 Interventional Accepts healthy volunteers Results available

Hydroxychloroquine as Post-Exposure Prophylaxis Against COVID-19 Infection

NCT04372017
View directory record Official record
Conditions
COVID-19, SARS-CoV 2
Interventions
Hydroxychloroquine, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Sanford Health
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Sioux Falls, South Dakota
Source: ClinicalTrials.gov public record
Updated Dec 10, 2021 · Synced Oct 11, 2026, 12:51 PM EDT
Completed Phase 2 Interventional Results available

Treatment With CSL312 in Adults With Coronavirus Disease 2019 (COVID-19)

NCT04409509
View directory record Official record
Conditions
Coronavirus Disease 2019 (COVID-19)
Interventions
Garadacimab, Factor XIIa Antagonist Monoclonal Antibody, Placebo
Biological · Drug
Lead sponsor
CSL Behring
Industry
Eligibility
18 Years and older
Enrollment
124 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
14
States / cities
Bradenton, Florida • St. Petersburg, Florida • Mason City, Iowa + 11 more
Source: ClinicalTrials.gov public record
Updated Jan 24, 2022 · Synced Oct 11, 2026, 12:51 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Mesenchymal Stem Cells for the Treatment of COVID-19

NCT04573270
View directory record Official record
Conditions
Covid19, Prophylaxis
Interventions
PrimePro, Placebo
Biological · Other
Lead sponsor
Thomas Advanced Medical LLC
Industry
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Culver City, California
Source: ClinicalTrials.gov public record
Updated Oct 5, 2020 · Synced Oct 11, 2026, 12:51 PM EDT
Terminated Phase 3 Interventional Results available

COVID-19 Positive Outpatient Thrombosis Prevention in Adults Aged 40-80

NCT04498273
View directory record Official record
Conditions
COVID-19
Interventions
Apixaban 2.5 MG, Apixaban 5MG, Aspirin, Placebo
Drug
Lead sponsor
Frank C Sciurba
Other
Eligibility
40 Years to 80 Years
Enrollment
657 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
71
States / cities
Los Angeles, California • Palo Alto, California • San Francisco, California + 51 more
Source: ClinicalTrials.gov public record
Updated Feb 17, 2022 · Synced Oct 11, 2026, 12:51 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Low vs. Moderate to High Dose Vitamin D for Prevention of COVID-19

NCT04868903
View directory record Official record
Conditions
SARS-CoV-2 Infection
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
1,475 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
2
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 22, 2026 · Synced Oct 11, 2026, 12:51 PM EDT