Serotype distribution of pneumococci isolated from 818 episodes of acute otitis media from children less than 5 years of age in Gipuzkoa, Northern Spain (1999–2010).

1PCV7: number of isolates of serotypes included in the PCV7: serotypes 4, 6B, 9V, 14, 18C, 19F and 23F.2PCV10: number of isolates of serotypes 1, 5, and 7F, included in the PCV10 but not in the PCV7.3PCV13: number of isolates of serotypes 3, 6A, and 19A, included in the PCV13 but not in the PCV10.4Non-PCV13 serotype (2, 7A, 13, 17F, 18F, 19B, 24, 25, 28, 29, 34, 36, 39,41,47) who total number was less than 4 were grouped as “Others”.