Fig. 1
From: Spread of avian pathogenic Escherichia coli ST117 O78:H4 in Nordic broiler production
Maximum-likelihood tree of 114 E. coli isolates based on 145,637 core SNPs. The analysis shows a clade of 62 APEC isolates collected from both broilers and parents (P) on Danish (DK), Finnish (FIN) and Norwegian (NO) chicken farms. All 62 isolates belonged to ST117. Isolate groups of the same serotype and ST are presented in identical colors. Isolates collected from diseased animals are marked with a black strip, whereas the white strip indicates isolates from healthy chickens. E. coli strain CFT073 served as reference and the scale indicates substitutions per site