Fig. 2: Distribution and sequence types of multidrug-resistant E. coli isolates from Chinese pig farms.

a A map of China showing the percentages of multidrug-resistant E. coli isolates from pig farms in different provinces of China (“x” refers to percent multidrug-resistant isolates); different colors represent percentages; small circles in green, purple and blue show the distribution of carbapenem-resistant, colistin-resistant, and tigecycline-resistant E. coli isolates, respectively; numbers in small circles represent the numbers of carbapenem-resistant, colistin-resistant, and tigecycline-resistant E. coli isolates, respectively, in different provinces; ESBL-producing E. coli isolates are also indicated. b Analysis of the minimum spanning tree of the 515 sequenced E. coli isolates based on the sequence type. TGC tigecycline, ESBL extended-spectrum beta-lactamase, MLST multilocus sequence typing, ST sequence type.