Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Yellow Fever: early-phase trial registry
1 of 4 indexed Yellow Fever trials are currently recruiting, with more weight in Phase 1-2.
Corpus placement: #4,115 of 28,707 conditions by registered trial count.
4 US clinical trials · 1 currently recruiting · #4,115 of 28,707 conditions by registered trial count
Yellow Fever: 4 US clinical trials tracked, 1 recruiting.
Yellow Fever is the subject of 4 registered US clinical trials on ClinicalTrials.gov, 1 of them currently open to new participants. 0 are in Phase 3-4 (later-stage) and 4 in Phase 1-2 (earlier-stage). The most active sponsor is Sanofi Pasteur, a Sanofi Company, running 2 of these trials.
Enrollment posture brief
Registry condition yellow-fever
OPEN 1 | RECR 25% | LATE 0 | EARLY 4 | RANK #4115 | SPON 2
Volume-matched condition peers
Nearest open-share peer: Abdominal Cancer (25% recruiting · 8 trials)
Yellow Fever lists 1 open slots (25% of 4 indexed trials). Peers are matched on registered volume, not therapeutic-area browse lists. How peer matching works →
Key findings
What ClinicalTrials.gov does not surface for Yellow Fever on its own pages , computed from the registry mirror as of 2026-08-08. Each line carries its own denominator so it can be quoted as it stands.
-
Yellow Fever is recruiting below its size-band peers.
1 of 4 indexed trials (25%) are open to enrollment, against a 46.5% average across 27,806 conditions with fewer than 20 trials. The peer set uses the same ClinicalTrials.gov-derived counts as this page.
Open and recent trials
4 total, page 1 of 1
Immunogenicity of Yellow Fever Vaccine 17D in Adults With Prior 17D Vaccination
Oregon Health and Science University
NCT05859490
Study on an Investigational Yellow Fever Vaccine Compared With YF-VAX in Adults in the USA
Sanofi Pasteur, a Sanofi Company
NCT04942210
Immune Response to Different Schedules of a Tetravalent Dengue Vaccine Given With or Without Yellow Fever Vaccine
Sanofi Pasteur, a Sanofi Company
NCT01488890
The Effect of Inflammation and Damage to Lymph Node Structures on Durable Protective Immunity Following Yellow Fever Vaccination
University of Minnesota
NCT04269265
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 2 |
| Phase 2 | 2 |
Top Sponsors
Named interventions
Most-linked intervention names on Yellow Fever records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Yellow Fever trials. A trial with sites in several states counts in each.
Source: ClinicalTrials.gov, National Library of Medicine. Data is informational only.
Related
What to do with this Yellow Fever page
4 registered trials, 1 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- 1 Yellow Fever trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
- Sanofi Pasteur, a Sanofi Company sponsors the most Yellow Fever trials on record, review their full trial history before evaluating a specific study. See Sanofi Pasteur, a Sanofi Company's trials
- Bring the specific trial ID (NCT number) to your own doctor before enrolling, this page is a directory, not medical guidance. Read the trial-finding guide
Trial and recruiting counts reflect ClinicalTrials.gov registry status as of the data vintage above; individual trial eligibility and enrollment status can change.
Every figure on PlainTrial is rendered directly from the ClinicalTrials.gov registry, no number is typed in by an editor. This Yellow Fever condition card totals 4 registered trials; most-linked intervention Yellow Fever; top US site state Utah. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.