Core Insights - Valneva SE reported positive antibody persistence data for its chikungunya vaccine IXCHIQ® four years post-vaccination, confirming strong and long-lasting antibody levels across all age groups [1][2][9] Vaccine Efficacy - Among 254 healthy adults in the trial, 95% maintained neutralizing antibody titers significantly above the seroresponse threshold four years after a single-dose vaccination [2][4] - Antibody persistence in older adults (65+) was comparable to younger adults (18-64 years) in terms of geometric mean titers and seroresponse rates [2][9] Safety Profile - The trial VLA1553-303, supported by CEPI and the EU's Horizon Europe program, reported no safety concerns or ongoing adverse events at the time of participant enrollment [3][4] - Long-term safety data was collected for up to two years, with no serious adverse events reported [3] Strategic Partnerships - Valneva expanded its partnership with CEPI in 2024 to enhance vaccine access in low- and middle-income countries (LMICs) [4][12] - An exclusive license agreement was established with the Serum Institute of India to facilitate vaccine supply in Asia [4][12] Public Health Context - Chikungunya virus has been identified in over 110 countries, with significant economic and medical burdens expected to increase due to climate change [5][10] - The World Health Organization has recognized chikungunya as a major public health issue, emphasizing the need for effective vaccination strategies [5][10] Company Overview - Valneva is a specialty vaccine company focused on developing and commercializing vaccines for infectious diseases, addressing unmet medical needs [6][8] - The company has a strong track record in advancing multiple vaccines from early research to approvals, including proprietary travel vaccines [7][8]