Clinical trials
Observational COVID-19 trials in the United States
Search ClinicalTrials.gov registrations by keyword, then narrow by condition, phase, status, country and start year.
504 trials match Source: ClinicalTrials.gov registrations
Trials started per year
By phase, 2000 to 2026.
| Category | Trials |
|---|---|
| 2011 | 1 |
| 2014 | 1 |
| 2016 | 1 |
| 2019 | 4 |
| 2020 | 253 |
| 2021 | 131 |
| 2022 | 55 |
| 2023 | 31 |
| 2024 | 15 |
| 2025 | 9 |
| 2026 | 3 |
Status
Trials by registry status. Select a bar to filter.
| Category | Trials |
|---|---|
| Completed | 324 |
| Unknown status | 54 |
| Recruiting | 38 |
| Active, not recruiting | 35 |
| Terminated | 30 |
| Withdrawn | 14 |
| Suspended | 4 |
| Enrolling by invitation | 3 |
| Not yet recruiting | 2 |
Top lead sponsors
A sponsor with a page on Pharma Observatory links to it.
| Category | Trials |
|---|---|
| Duke University | 17 |
| National Institute of Allergy and Infectious Diseases (NIAID) | 16 |
| Columbia University | 13 |
| Mayo Clinic | 12 |
| Pfizer | 12 |
| M.D. Anderson Cancer Center | 10 |
| Methodist Health System | 8 |
| University of California, San Francisco | 8 |
| Massachusetts General Hospital | 7 |
| NYU Langone Health | 7 |
Top conditions
MeSH conditions the trials were registered with, not their broader categories. A condition with a page on Pharma Observatory links to it.
| Category | Trials |
|---|---|
| COVID-19 | 504 |
| Coronavirus Infections | 77 |
| Post-Acute COVID-19 Syndrome | 19 |
| Influenza, Human | 17 |
| Severe Acute Respiratory Syndrome | 16 |
| Virus Diseases | 10 |
| Respiratory Distress Syndrome | 9 |
| Hematologic Neoplasms | 8 |
| Respiratory Insufficiency | 8 |
| Respiratory Tract Infections | 8 |
Trials
Showing 1 to 25 of 504. Each trial links to its page on Pharma Observatory.
404 more trials match. See them on Pharma Observatory
Recently changed trials
Changes observed in the last 7 days, newest first, site-count changes left out. Source: ClinicalTrials.gov.
Go deeper on Pharma Observatory
Pharma Observatory connects clinical trials, sponsors, sites and investigators in one searchable platform.