Valneva Reports Positive Final Phase 2 Antibody Persistence and Safety Results in Children for its Chikungunya Vaccine IXCHIQ®

Saint-Herblain (France), December 10, 2025 – Valneva SE (Nasdaq: VALN; Euronext Paris: VLA), a specialty vaccine company, today announced positive final antibody persistence and safety data for its Phase 2 clinical trial evaluating the safety and immunogenicity of two different dose levels of its single-shot chikungunya vaccine, IXCHIQ®, in 304 children, twelve months after vaccination. Partially funded by the Coalition for Epidemic Preparedness Innovations (CEPI), with support from the European Union, the trial results continue to support future Phase 3 development in children, which the Company plans to initiate after gathering additional real-world experience in the adolescent population.