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Minimum spanning tree of 578 M. pneumoniae isolates from four counties in Sweden from 1996 to 2017. Each circle denotes an MLVA type. The size of the circle is proportional to the number of isolates belonging to each MLVA type, and the color corresponds to the P1 type. The distance between MLVA types corresponds to the number of allelic changes, and each line represents one allelic change.
