Dendrogram constructed by similarity and clustering analysis using the Dice coefficient and UPGMA of the digitalized PFGE profiles of 42
isolates included in the present study. A total of 17 erythromycin-resistant isolates and 25 erythromycin-susceptible isolates were included. A tolerance of 1% was applied. The vertical line indicates the 70% level of similarity. The upper-case letters indicate the clonal complexes. cMLSB: constitutive resistance to macrolide-lincosamide-streptogramin B; iMLSB: inducible resistance to macrolide-lincosamide-streptogramin B; M: resistance to erythromycin only. (-): indicates the absence of resistance-associated genes.