Figure 2.

Schematic of the pneumococcal vaccines available in 2022, including serotype composition (light colored circles), protein carrier (dark colored central circles), and year of licensure (developed by the authors, adapted from products packages insert). Abbreviations: PPV23 – 23-valent pneumococcal polysaccharide vaccine; PCV10 – 10-valent pneumococcal conjugate vaccine; PCV13 – 13-valent pneumococcal conjugate vaccine; PCV15 – 15-valent pneumococcal conjugate vaccine; PCV20 – 20-valent pneumococcal conjugate vaccine; PCV10-SII – 10-valent pneumococcal conjugate vaccine produced by Serum Institute of India; NTHiD – non-typeable Haemophilus influenzae protein D; TT – tetanus toxoid; DT – diphtheria toxoid; CRM₁₉₇ – diphtheria toxoid variant CRM₁₉₇ (Corynebacterium diphtheria cross-reactive material 197).