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Representative SmaI PFGE patterns of the 53 erm-positive erythromycin-resistant S. pyogenes isolates according to biotype, T serotype, and emm type. The triangles are collapsed branches gathering isolates with 80% similarity of banding patterns. MWa, molecular weight marker (lambda ladder; Bio-Rad); T28/ntb, one isolate nontypeable for T antigen. T28/ntc, three isolates nontypeable for T antigen; UPGMA, unweighted pair group method with arithmetic mean.
