Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Vaccine Reaction: early-phase trial registry
1 of 5 indexed Vaccine Reaction trials are currently recruiting, with more weight in Phase 1-2.
Corpus placement: #3,391 of 28,707 conditions by registered trial count.
5 US clinical trials · 1 currently recruiting · #3,391 of 28,707 conditions by registered trial count
Vaccine Reaction: 5 US clinical trials tracked, 1 recruiting.
Vaccine Reaction is the subject of 5 registered US clinical trials on ClinicalTrials.gov, 1 of them currently open to new participants. 1 are in Phase 3-4 (later-stage) and 2 in Phase 1-2 (earlier-stage). The most active sponsor is PharmaJet, running 1 of these trials.
Enrollment posture brief
Registry condition vaccine-reaction
OPEN 1 | RECR 20% | LATE 1 | EARLY 2 | RANK #3391 | SPON 1
Volume-matched condition peers
Nearest open-share peer: Accelerated Phase Chronic Myelogenous Leukemia, BCR-ABL1 Positive (20% recruiting · 10 trials)
Vaccine Reaction lists 1 open slots (20% of 5 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 Reaction 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 Reaction is recruiting below its size-band peers.
1 of 5 indexed trials (20%) 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.
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One sponsor concentrates Vaccine Reaction research.
PharmaJet accounts for 1 of 5 trials (20%). 5 distinct sponsors appear on at least one study for this condition label.
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Typical Vaccine Reaction enrolment sits around 101 participants.
Median target enrolment is 101 among the 5 trials that report a genuine target (sentinel values excluded). 2 of those (40%) plan for fewer than 100 participants.
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Vaccine Reaction splits between interventional and observational designs.
3 interventional and 2 observational studies make up this index (60% interventional). Study type is sponsor-reported on ClinicalTrials.gov.
Open and recent trials
5 total, page 1 of 1
Intradermal Influenza Vaccination
Yale University
NCT06067555
Understanding Poor Vaccine Responses to Hepatitis B Vaccination
NYU Langone Health
NCT04674462
Safety, Reactogenicity and Immunogenicity of a Venezuelan Equine Encephalitis DNA Vaccine Candidate Administered by Jet Injection
PharmaJet
NCT06002503
Post COVID-19 Vaccination Analysis in Healthcare Worker Recipients
Huntington Memorial Hospital
NCT04922944
Kinetics of the Immune Response to Inactivated Influenza Vaccine in Healthy Adults
Vanderbilt University Medical Center
NCT03743688
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 2 |
| Phase 4 | 1 |
Top Sponsors
Named interventions
Most-linked intervention names on Vaccine Reaction records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Vaccine Reaction 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 Reaction page
5 registered trials, 1 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- 1 Vaccine Reaction trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
- PharmaJet sponsors the most Vaccine Reaction trials on record, review their full trial history before evaluating a specific study. See PharmaJet'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 Reaction condition card totals 5 registered trials; most-linked intervention Influenza Vaccine Recipients; top US site state Tennessee. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.