🏛️ Verified NIH Record • Updated 2026-07-08

Antibody Persistence And Long Term Safety Of A Chikungunya Virus Vaccine (VLA1553) (NCT04838444)

An Open-Label, Single Arm Trial To Evaluate Antibody Persistence And Long Term Safety Of A Live-Attenuated Chikungunya Virus Vaccine (VLA1553) In Adults Aged 18 Years and Above

🔵 Active, Not Recruiting Phase3 💊 Investigational Drug / Biologic Sponsor: Valneva Austria GmbH

🩺 Plain-English Summary (8th-Grade Level)

In this open-label Phase 3b, single arm trial, persistence of antibodies and long term safety will be evaluated in up to 375 participants rolled over from trial VLA1553-301 (NCT number: NCT04546724).

Who can join: Review the eligibility criteria below.

Location: Accelerated Enrollment Solutions (AES) — Phoenix, Arizona

Age range: 18 Years

🧪 Interventions in This Study

📋 "Do I Qualify?" — 1-Minute Self Screener

Instant Checklist

Full eligibility criteria are available on the official NIH protocol. View the criteria ↗

📍 All Participating Trial Locations (10 Sites)

  • Accelerated Enrollment Solutions (AES) — Phoenix, Arizona
  • Velocity Clinical Research — Hallandale, Florida
  • Accelerated Enrollment Solutions (AES) — Chicago, Illinois
  • Alliance for Multispecialty Research (AMR) — Lexington, Kentucky
  • Velocity Clinical Research — Grand Island, Nebraska
  • Velocity Clinical Research — Omaha, Nebraska
  • Alliance for Multispecialty Research (AMR) — Knoxville, Tennessee
  • Velocity Clinical Research — Austin, Texas
  • Velocity Clinical Research — West Jordan, Utah
  • Allliance for Multispecialty Research (AMR) — Norfolk, Virginia

💰 Cost, Insurance & Patient Rights

  • 100% Free Items: The investigational treatment and protocol-required procedures are supplied at zero cost by the sponsor.
  • Routine Patient Care: Under federal law (ACA § 2709) and many state statutes, routine care costs are covered during participation.
  • Voluntary Participation: You may withdraw at any time without affecting your standard medical care.

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💡 How to Participate

  1. Check the checklist above to see if you may qualify.
  2. Review the official NIH record below to find the coordinating site.
  3. Ask about the visit schedule, what is covered at no cost, and any travel support.
  4. Confirm with your own doctor before making a decision.
🏛️ View Official NIH Record ↗