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Minimum Spanning Tree based on MLST of Escherichia coli by U.S. state of isolation and carbapenemase gene identification. Arrows indicate isolates that harbor a carbapenemase gene. The green square shows the ST131 lineage. The purple circle delineates strains harboring blaCTX-M-15; the red circle shows the strains harboring mostly blaCTX-M-14 and blaCTX-M-27. Reference strain (REF): NZ_CP117235, Escherichia coli strain ATCC25922.
