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A Randomized, Double-Blinded Phase 3 Study to Demonstrate Lot-to-Lot Consistency of Three Lots of a Live-Attenuated Chikungunya Virus Vaccine Candidate (VLA1553) in Healthy Adults Aged 18 to 45 Years

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Trial Profile

A Randomized, Double-Blinded Phase 3 Study to Demonstrate Lot-to-Lot Consistency of Three Lots of a Live-Attenuated Chikungunya Virus Vaccine Candidate (VLA1553) in Healthy Adults Aged 18 to 45 Years

Status: Completed
Phase of Trial: Phase III

Latest Information Update: 09 Feb 2026

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At a glance

  • Drugs VLA 1553 (Primary)
  • Indications Chikungunya virus infections
  • Focus Pharmacodynamics; Registrational
  • Sponsors Valneva

Most Recent Events

  • 19 Jan 2026 According to a Valneva media release, the company has decided to voluntarily withdraw its Biologics License Application (BLA) for VLA1553. This decision follows the U.S. FDA's suspension of the license in August 2025.
  • 09 Nov 2023 According to a Valneva media release, the U.S. Food and Drug Administration approved Ixchiq, chikungunya vaccine for individuals 18 years of age and older who are at increased risk of exposure to chikungunya virus.
  • 29 Aug 2023 According to a Valneva media release, the company intends to make additional regulatory submissions in 2023. A Biologic License Application (BLA) is currently under priority review1 by the U.S. Food and Drug Administration (FDA).

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