Cladogram showing the relationship of beta-lactamase producing <i>E</i>. <i>coli</i> isolates typed by MLST (n = 28).

<p>STs, phylogroups and sample numbers are shown. Isolates from meat of locally reared chickens (n = 5) are shown in purple. Isolates from meat of chickens imported from the US (n = 11) and Brazil (n = 12) are shown in red and green, respectively. A star (*) indicates ST types that have not been described before.