FIG. 3.

(A) PFGE of the SmaI-digested genomic DNA of the Cordobes clone in comparison with the South American and pediatric MRSA clones. MRSA epidemic clones isolated in Cordoba, Argentina (A1 and B1) were analyzed by PFGE to compare their DNA patterns with those of the South American (S1 and S2) and the pediatric (P) MRSA clones already described (9). C1, DNA pattern for local MRSA isolates that is closely related to that for the pediatric clone (P); E1, sporadic MRSA local isolate included for comparative analysis. (B) PFGE of SmaI-digested genomic DNA of A1 and A8 MRSA subtypes isolated in hospital H5 from May to July 1999. Lanes 1 to 7, seven strains that produced an outbreak 2 months later in the same hospital; lane L, DNA molecular size markers (lambda DNA ladder; Promega).