Table 1 Serotypes included in licensed pneumococcal vaccines. PCV20 covers the largest number of serotypes and includes those serotypes already included in lower valency PCV’s. PPV23 covers all serotypes included in PCV20 except 6 A, but additionally includes serotypes 2, 9 N, 17 F, 20 not covered by any currently licensed PCV’s

From: A brief history of and future prospects for pneumococcal vaccination in Malaysia