- Compared to Phase 1, the higher doses used in this trial elicited higher antibody responses across all serotypes
- Encouraging immunogenicity profile confirmed, including older adults (50-65 years)
- VLA15 generally safe across all dose and age groups tested
- No related Serious Adverse Events (SAEs) associated with VLA15
Saint-Herblain (France), July 22, 2020 – Valneva SE (“Valneva”), a specialty vaccine company focused on prevention of diseases with major unmet needs, today announced positive initial results for its first Phase 2 study (VLA15-201) of Lyme disease vaccine candidate VLA15.
VLA15 was immunogenic across all dose groups tested. Compared to Phase 1, the higher doses used in this trial elicited higher antibody responses across all serotypes. Seroconversion rates (SCR) in the highest dose ranged from 81.5% (ST1) to 95.8% (ST2). In the age group comparable to the age group investigated in Phase 1 (18-49 years), SCRs ranged from 85.6% to 97%. The immunological response in older adults, one of the main target groups for a Lyme vaccine, is particularly encouraging.
Results did not indicate that prior exposure to Lyme (sero-positivity) has an impact on immunogenicity or safety.
As part of further Phase 2 data to be released in a few months, an analysis of the functionality of the antibodies generated with VLA15 will be conducted. In close collaboration with regulatory authorities, Valneva has developed a Serum Bactericidal Antibody assay (“SBA”) for that purpose.
VLA15 was generally safe across all dose and age groups tested. No related Serious Adverse Events (SAEs) were observed with VLA15 in this study in any treatment group. Reactogenicity decreased with subsequent vaccinations.
Overall, the tolerability profile including rates of fever appeared to be comparable to other lipidated recombinant vaccines or lipid-containing formulations.