“…Of these serotypes, 15A, 23A, 35B, and 6C were the most common among penicillin-nonsusceptible isolates from population-based invasive pneumococcal surveillance in the United States during 2007. 16 The emergence of non-PCV7 serotypes led to the development and introduction of broader PCVs: a 10-valent vaccine (PCV10)-PCV7 with serotypes 1, 5, and 7F added 17,18 ; and a 13-valent vaccine (PCV13)-PCV10 with serotypes 3, 6A, and 19A added. 19 Recently, the 15-valent vaccine (PCV15) with serotypes 22F and 33F added to PCV13, has been tested in clinical trials.…”