Figure 2.
Phylogenetic tree of Escherichia coli ST131 isolates, including its single locus variants included in the genomic relatedness analysis, EU/EEA and outside, 2005–2024 (n = 691)
ADs: allelic differences; cgMLST: core genome multilocus sequence typing; ESBL: extended-spectrum beta-lactamase; EU/EEA: European Union/European Economic Area.
The phylogenetic tree was constructed based on cgMLST using neighbour joining algorithm. Of note, a cgMLST-based phylogeny has limitations on resolving E. coli ST131 population structure and division into clades. Categories in each ring are arranged in decreasing order of frequency and represent findings from more than 10 isolates. The eight largest clusters with isolates within 10 ADs in the tree are coloured following the ring 1 legend.
