Merck Announces Positive Data for V116, an Investigational, 21-Valent Pneumococcal Conjugate Vaccine Specifically Designed for Adults

Merck (NYSE: MRK), known as MSD outside of the United States and Canada, today announced results from STRIDE-10, a Phase 3 trial evaluating V116, the company’s investigational, adult-specific 21-valent pneumococcal conjugate vaccine, at the 34^th European Society of Clinical Microbiology and Infectious Diseases (ESCMID Global) in Barcelona, Spain. The trial evaluated the immunogenicity, tolerability and safety of V116 compared to PPSV23 (pneumococcal vaccine, polyvalent [23-valent]) in adults 50 years of age and older who had not previously received a pneumococcal vaccine.

Key results from the study include:

• V116 elicited immune responses that were noninferior compared to PPSV23 for the 12 serotypes (or strains) common to both vaccines, as measured by serotype-specific opsonophagocytic activity (OPA) geometric mean titers (GMTs) at Day 30.
• Immune responses elicited by V116 were superior for the nine serotypes included in V116 but not PPSV23, as measured by OPA GMT ratios at Day 30, and superior for eight of nine serotypes unique to V116 compared to PPSV23, as measured by the proportions of participants with ≥4-fold rise in immune responses.
• V116 had a safety profile comparable to PPSV23.

These data build upon Phase 3 trial results that were presented at this year’s Meeting of the International Society of Pneumonia and Pneumococcal Diseases and the 2023 World Vaccine Congress West Coast.

“Invasive pneumococcal disease and pneumococcal pneumonia represent significant public health challenges, particularly among older adult populations and those with risk conditions,” said Dr. Walter Orenstein, professor emeritus of medicine, epidemiology, global health and pediatrics at Emory University and member of Merck’s Scientific Advisory Committee. “These positive results show that V116 has the potential to help prevent invasive pneumococcal disease among adult populations.”

“Even with the availability of current pneumococcal conjugate vaccines for adults, gaps in serotype coverage for invasive pneumococcal disease persist,” said Dr. Eliav Barr, senior vice president, head of global clinical development and chief medical officer, Merck Research Laboratories. “These data add to the evidence supporting the potential for V116 to become an important new preventative option for adults, with results showing V116 elicited immune responses to the serotypes responsible for the majority of adult invasive pneumococcal disease.”