(A) PFGE patterns of SmaI digests of MRSA isolates from the two hospitals. Lane 6, NCTC 8325; lane 10, HUSA 304 (Hungarian clone); lane 2, HSJ 216 (Brazilian clone); lanes 4, 5, and 9, SJ isolates; lanes 3, 7, and 8, M isolates; lane 1, lambda molecular weight marker. (B) Dendrogram based on the similarities derived from the UPGMA and Dice coefficients, using Quantity One software. The scale at the top represents similarity.