Minimum spanning tree of ESBL producing <i>E</i>. <i>coli</i> multi locus sequence types (STs) detected in recreational water at different sites.

<p>Blue, green, red and yellow colours represent isolates detected at Bondivann (freshwater), Kalvøya, Holmenskjæret and Furstranda, respectively. Each node represents one ST. The thickness and length of the lines vary according to the similarity of STs in the connected nodes.</p>