PMID- 37389808 OWN - NLM STAT- MEDLINE DCOM- 20230703 LR - 20231116 IS - 2164-554X (Electronic) IS - 2164-5515 (Print) IS - 2164-5515 (Linking) VI - 19 IP - 2 DP - 2023 Aug 1 TI - Safety, tolerability, and immunogenicity of a 21-valent pneumococcal conjugate vaccine, V116, in Japanese healthy adults: A Phase I study. PG - 2228162 LID - 10.1080/21645515.2023.2228162 [doi] LID - 2228162 AB - V116 is an investigational 21-valent pneumococcal conjugate vaccine (PCV) to address the burden of residual adult pneumococcal disease after the introduction of pediatric PCVs into national immunization programs (NIPs) and includes serotypes highly prevalent in adult invasive pneumococcal disease (IPD). This Phase I study assessed the safety, tolerability, and immunogenicity of V116 in Japanese adults. Participants >/=20 years of age were randomized to receive a single dose of V116 or 23-valent pneumococcal polysaccharide vaccine (PPSV23) at day 1. Outcomes were solicited injection-site and systemic adverse events (AEs) from day 1 to day 5, vaccine-related serious AEs from day 1 through day 30, and serotype-specific opsonophagocytic antibody (OPA) titers and immunoglobulin G (IgG) concentrations at day 30. Overall, 102 participants were randomized 1:1 to each group. Comparable proportions vaccinated with V116 and PPSV23 experienced >/=1 solicited injection-site AE and >/=1 solicited systemic AE. The most common injection-site AEs were injection-site pain (V116: 54.9%; PPSV23: 66.7%) and swelling (V116 and PPSV23: 13.7%), and the most common systemic AEs were myalgia (V116: 17.6%; PPSV23: 19.6%) and fatigue (V116: 13.7%; PPSV23: 9.8%). Solicited AEs were mostly mild and of