Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Influenza Vaccination: later-stage trial registry
1 of 4 indexed Influenza Vaccination trials are currently recruiting, with more weight in Phase 3-4.
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
Influenza Vaccination: 4 US clinical trials tracked, 1 recruiting.
Influenza Vaccination is the subject of 4 registered US clinical trials on ClinicalTrials.gov, 1 of them currently open to new participants. 1 are in Phase 3-4 (later-stage) and 0 in Phase 1-2 (earlier-stage). The most active sponsor is University of Pennsylvania, running 2 of these trials.
Enrollment posture brief
Registry condition influenza-vaccination
OPEN 1 | RECR 25% | LATE 1 | EARLY 0 | RANK #4115 | SPON 2
Volume-matched condition peers
Nearest open-share peer: Abdominal Cancer (25% recruiting · 8 trials)
Influenza Vaccination 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 Influenza Vaccination 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.
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Influenza Vaccination 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
Study of Immune Responses to Influenza Vaccination
University of Pennsylvania
NCT03346772
Strengthening Intentions
University of Pennsylvania
NCT07222774
Incentives for Influenza Vaccination
University of Southern California
NCT06300242
Efficacy of Communication Modalities for Promoting Flu Shots
Geisinger Clinic
NCT05509270
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 4 | 1 |
Top Sponsors
Named interventions
Most-linked intervention names on Influenza Vaccination records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Influenza Vaccination 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 Influenza Vaccination page
4 registered trials, 1 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- 1 Influenza Vaccination trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
- University of Pennsylvania sponsors the most Influenza Vaccination trials on record, review their full trial history before evaluating a specific study. See University of Pennsylvania'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 Influenza Vaccination condition card totals 4 registered trials; most-linked intervention Patient portal; top US site state Pennsylvania. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.