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Population snapshot of clusters of E. coli based on the E. coli MLST database (http://mlst.warwick.ac.uk/mlst/dbs/Ecoli) with related and unrelated STs. STs identified in this study are indicated as follows: red squares, silE-positive isolates; light blue squares, human silE-negative isolates; green squares, avian isolates; and yellow boxes, clonal complexes (CC).
