Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Vaccine Response: later-stage trial registry
3 of 3 indexed Vaccine Response trials are currently recruiting, with more weight in Phase 3-4.
Corpus placement: #5,209 of 28,707 conditions by registered trial count.
3 US clinical trials · 3 currently recruiting · #5,209 of 28,707 conditions by registered trial count
Vaccine Response: 3 US clinical trials tracked, 3 recruiting.
Vaccine Response is the subject of 3 registered US clinical trials on ClinicalTrials.gov, 3 of them currently open to new participants. 2 are in Phase 3-4 (later-stage) and 1 in Phase 1-2 (earlier-stage). The most active sponsor is The Jackson Laboratory, running 1 of these trials.
Enrollment posture brief
Registry condition vaccine-response
OPEN 3 | RECR 100% | LATE 2 | EARLY 1 | RANK #5209 | SPON 1
Volume-matched condition peers
Nearest open-share peer: Aortic Arch Aneurysm (100% recruiting · 5 trials)
Vaccine Response lists 3 open slots (100% of 3 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 Vaccine Response 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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Vaccine Response is recruiting above its size-band peers.
3 of 3 indexed trials (100%) 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
3 total, page 1 of 1
Thymalfasin (Thymosin Alpha 1; Ta1) as an Enhancer of Vaccine Response Among Older Adults Receiving Booster Doses of COVID-19 Vaccine
The Methodist Hospital Research Institute
NCT06821100
A Deep Longitudinal Analysis of Next Generation Influenza Vaccines in Older Adults
The Jackson Laboratory
NCT05518500
Durability of Vaccine Responses
Emory University
NCT05801978
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 1 |
| Phase 4 | 2 |
Top Sponsors
Named interventions
Most-linked intervention names on Vaccine Response records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Vaccine Response 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 Vaccine Response page
3 registered trials, 3 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- 3 Vaccine Response trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
- The Jackson Laboratory sponsors the most Vaccine Response trials on record, review their full trial history before evaluating a specific study. See The Jackson Laboratory'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 Vaccine Response condition card totals 3 registered trials; most-linked intervention Quadrivalent seasonal influenza vaccine; top US site state Texas. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.