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Minimal spanning tree of ESBL- and/or pAmpC-producing E. coli. Each circle indicates one sequence type (ST), divided into one sector for each isolate. The phylogenetic group is displayed within the sector, and each circle is bordered by the ST number. The numbers on the connecting line between STs within the MSTree indicate the number of different alleles. Solid and dotted lines represent allele differences of ≤3 and 4, respectively; allele differences >4 are not displayed.
