On May 20, 2021, Merck announced V114, the company’s investigational 15-valent pneumococcal conjugate vaccine, met its primary immunogenicity and safety endpoints in two trials of the V114 Phase 3 pediatric clinical program. These data support the potential use of V114 in healthy infants who may have previously started a pneumococcal vaccination series with the currently available 13-valent pneumococcal conjugate vaccine (PCV13) (PNEU-DIRECTION), and in a catch-up setting for healthy children who were either pneumococcal vaccine-naïve or who previously received a full or partial regimen with lower valency pediatric pneumococcal conjugate vaccines (PCV) (PNEU-PLAN).

In the PNEU-DIRECTION (V114-027) interchangeability study in healthy infants 42-90 days of age, immune responses in those who received a four-dose series of PCV13, and those who received a mixed dose schedule of PCV13 followed by V114, were generally comparable for the 13 serotypes, or strains of pneumococcal disease, targeted by both vaccines. In the PNEU-PLAN (V114-024) catch-up study, immune responses were generally comparable to PCV13 for the 13 shared serotypes when V114 was used as a catch-up regimen in healthy children 7 months to 17 years of age who were either pneumococcal vaccine-naïve or who previously received a partial or full regimen of a licensed pediatric PCV. For serotypes 22F and 33F, two serotypes included in V114 but not PCV13, immunogenicity in PNEU-PLAN was higher in the V114 group than in the PCV13 group. In each study, V114 was generally well-tolerated, with a safety profile comparable to PCV13.

There are 100 different types of pneumococcal bacteria, which can affect children differently than adults. Children under the age of 2 are particularly vulnerable to pneumococcal infection and invasive pneumococcal disease incidence remains highest in the first year of life. Certain pneumococcal serotypes continue to put children at risk, including serotypes 22F and 33F which represent 16 percent of all cases of invasive pneumococcal disease in children under the age of 5.

Full results from PNEU-DIRECTION and PNEU-PLAN will be presented at a future scientific congress. The V114 Phase 3 clinical development program is comprised of 16 trials investigating the safety, tolerability and immunogenicity of V114 in a variety of populations who are at increased risk for pneumococcal disease including healthy older adults and children, as well as people who are immunocompromised or have certain chronic medical conditions. An overview of the late-stage development program is available here. Plans are on track for submission of a supplemental regulatory licensure application to the U.S. Food and Drug Administration (FDA) for use in children before the end of the year, pending action on the adult Biologics Licensure Application currently under FDA review. Merck is involved in litigation challenging the validity of several Pfizer Inc. patents that relate to pneumococcal vaccine technology in the United States and several foreign jurisdictions.

V114 is Merck’s investigational 15-valent pneumococcal conjugate vaccine in Phase 3 development for the prevention of pneumococcal disease in adults and children. V114 consists of pneumococcal polysaccharides from 15 serotypes conjugated to a CRM197 carrier protein and includes serotypes 22F and 33F, which are commonly associated with invasive pneumococcal disease worldwide and are not contained in the pneumococcal conjugate vaccine currently licensed for use in children and adults.