During 13 years, Sp carriage was assessed annually for patients (>7900) with AOM.
Before PCV7 period, PCV7 serotypes accounted for 45% and now they have disappeared.
ST 19A increased from 9 to 16% before PCV13 implementation and decreased to 1% after.
Predominant serotypes after PCV13 implementation were 15B/C, 11A, 15A, and 35B.
Penicillin non-susceptible Sp decreased from 67% to 33% over 13 years.