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Dendrograms based on RAPD typing showing genetic relatedness among CTX-M-producing E. coli isolates (A) and among CTX-M-producing K. pneumoniae isolates (B) from various centers. The vertical dotted line indicates the 0.90 similarity score adopted to assign isolates to the same lineage. The origins of isolates are also indicated (abbreviations are the same as in Fig. 1). Lineages for which conjugative transfer of the CTX-M determinant was demonstrated are underlined.
