Alejandra Gurtman, MD, discussed the phase 2 data at IDWeek 2026 which showed the investigational 25-valent pneumococcal conjugate vaccine 25vPnC produced serotype 3 antibody levels about 15-fold higher than Prevnar 20 after the booster dose, targeting a serotype still behind 10.6% of invasive pneumococcal disease in US children younger than five years.