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Dendrograms of pneumococcal isolates of emerging meropenem-non-susceptible (A) serotype 15A, and (B) serotype 23A based on SmaI-digested PFGE patterns. Isolate code, the first 4 digits indicate isolation year, followed by region [C (central), N (northern), E (eastern), S (southern)] and 2 digits of hospital number, then 3 digits of isolate number. Other abbreviations: MEM, meropenem; S, susceptible; I: intermediate; R, resistant; ST, sequence type.
