PRV-101 maintained safe, dose-dependent neutralizing antibody responses against coxsackie B viruses at approximately two years post-immunization in 21 treated participants versus 5 on placebo.
Observational (n=26)
Does the PRV-101 vaccine against coxsackieviruses B induce durable immune responses and remain safe at two years post-immunization in adults?
The PRV-101 vaccine against coxsackieviruses B demonstrates durable immunogenicity and safety at two years post-immunization, supporting its continued development for preventing acute infections and potentially linked chronic diseases like cardiomyopathies.
Abstract Background Coxsackie B viruses cause acute infections and have been linked to chronic diseases like cardiomyopathies, type 1 diabetes, and celiac disease. Despite their clinical significance, no vaccines exist for coxsackie B virus types. PRV-101, a new candidate vaccine covering five coxsackie B virus types, showed good immunogenicity and tolerability in a phase 1 trial (PROVENT) in adults. Methods We conducted an extended follow-up of the PROVENT trial to assess the long-term immune response and safety of PRV-101. A total of 26 participants from the original cohort (n=32) were enrolled for additional testing approximately two years post-immunization (11 high-dose, 10 low-dose, and 5 placebo). Coxsackie B virus -specific antibody responses were measured and compared to earlier time points. Results PRV-101 was safe with no late adverse effects or emergence of autoantibodies linked to type 1 diabetes or celiac disease. Neutralizing virus antibodies remained elevated, with a clear dose-dependent response. In the high-dose group, antibodies against all coxsackie B virus types reached presumably protective levels, except for coxsackie B virus 2, where two participants turned seronegative. ELISA tests confirmed elevated antibody levels against coxsackie B virus proteins. Discussion These results suggest that PRV-101 induces durable antibody responses lasting for at least two years. The findings support the continued development of PRV-101 for preventing both acute coxsackie B virus infections and chronic diseases like type 1 diabetes and celiac disease.
Laiho et al. (Mon,) conducted a observational in Coxsackie B virus infection prevention (n=26). PRV-101 vs. placebo was evaluated on Long-term immune response and safety. PRV-101 maintained safe, dose-dependent neutralizing antibody responses against coxsackie B viruses at approximately two years post-immunization in 21 treated participants versus 5 on placebo.