Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Zika Virus: early-phase trial registry
A small indexed set (4 trials) with no open enrollment listed right now.
Corpus placement: #4,115 of 28,707 conditions by registered trial count.
4 US clinical trials · none currently recruiting · #4,115 of 28,707 conditions by registered trial count
Zika Virus: 4 US clinical trials tracked, none currently recruiting.
Zika Virus is the subject of 4 registered US clinical trials on ClinicalTrials.gov, none currently recruiting. 0 are in Phase 3-4 (later-stage) and 3 in Phase 1-2 (earlier-stage). The most active sponsor is Valneva Austria, running 1 of these trials.
Enrollment posture brief
Registry condition zika-virus
OPEN 0 | RECR 0% | LATE 0 | EARLY 3 | RANK #4115 | SPON 1
Volume-matched condition peers
Nearest open-share peer: Accelerated Phase Chronic Myelogenous Leukemia (0% recruiting · 12 trials)
Zika Virus has no open enrollment in this registry pull (4 archived studies). Peers show how other volume-matched labels compare on open share. How peer matching works →
Key findings
What ClinicalTrials.gov does not surface for Zika Virus 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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Zika Virus is recruiting below its size-band peers.
0 of 4 indexed trials (0%) 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.
Indexed trials (enrollment closed)
4 total, page 1 of 1
A Study of Zika Vaccine mRNA-1893 in Adult Participants Living in Endemic and Non-Endemic Flavivirus Areas
ModernaTX
NCT04917861
Prospective Cohort Study of HIV and Zika in Infants and Pregnancy
Westat
NCT03263195
Randomized, Placebo-controlled, Observer-blinded Phase 1 Safety and Immunogenicity Study of Inactivated Zika Virus Vaccine Candidate in Healthy Adults
Valneva Austria
NCT03425149
Evaluation of Two Zika Viruses for Use in Controlled Human Infection Models (CHIM)
National Institute of Allergy and Infectious Diseases (NIAID)
NCT05123222
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 2 |
| Phase 2 | 1 |
Top Sponsors
Named interventions
Most-linked intervention names on Zika Virus records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Zika Virus 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 Zika Virus page
4 registered trials, 0 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- No Zika Virus trials are currently recruiting in this registry; that can change as new trials post, or check the broader research index. Browse research indexes
- Valneva Austria sponsors the most Zika Virus trials on record, review their full trial history before evaluating a specific study. See Valneva Austria'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 Zika Virus condition card totals 4 registered trials; most-linked intervention Placebo; top US site state Texas. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.