Escherichia coli ST131 is a globally dispersed extraintestinal pathogenic E. coli lineage contributing significantly to hospital and community acquired urinary tract and bloodstream infections. Here we describe a detailed phylogenetic analysis of the whole genome sequences of 284 Australian ST131 E. coli isolates from diverse sources, including clinical, food and companion animals, wildlife and the environment. Our phylogeny and the results of single nucleotide polymorphism (SNP) analysis show the typical ST131 clade distribution with clades A, B and C clearly displayed, but no niche associations were observed. Indeed, interspecies relatedness was a feature of this study. Thirty-five isolates (29 of human and six of wild bird origin) from clade A (32 fimH41, 2 fimH89, 1 fimH141) were observed to differ by an average of 76 SNPs. Forty-five isolates from clade C1 from four sources formed a cluster with an average of 46 SNPs. Within this cluster, human sourced isolates differed by approximately 37 SNPs from isolates sourced from canines, approximately 50 SNPs from isolates from wild birds, and approximately 52 SNPs from isolates from wastewater. Many ST131 carried resistance genes to multiple antibiotic classes and while 41 (14 %) contained the complete class one integron-integrase intI1, 128 (45 %) isolates harboured a truncated intI1 (462-1014 bp), highlighting the ongoing evolution of this element. The module intI1-dfrA17-aadA5-qacEΔ1-sul1-ORF-chrA-padR-IS1600-mphR-mrx-mphA, conferring resistance to trimethoprim, aminoglycosides, quaternary ammonium compounds, sulphonamides, chromate and macrolides, was the most common structure. Most (73 %) Australian ST131 isolates carry at least one extended spectrum β-lactamase gene, typically blaCTX-M-15 and blaCTX-M-27. Notably, dual parC-1aAB and gyrA-1AB fluoroquinolone resistant mutations, a unique feature of clade C ST131 isolates, were identified in some clade A isolates. The results of this study indicate that the the ST131 population in Australia carries diverse antimicrobial resistance genes and plasmid replicons and indicate cross-species movement of ST131 strains across diverse reservoirs.

Biomedical Center Charles University Czech Republic

CEITEC VETUNI University of Veterinary Sciences Brno Brno Czech Republic

Central West Pathology Laboratory Charles Sturt University Orange NSW 2800 Australia

Department of Biology and Wildlife Disease Faculty of Veterinary Hygiene and Ecology University of Veterinary Sciences Brno Czech Republic

Department of Clinical Microbiology and Immunology Institute of Laboratory Medicine The University Hospital Brno Brno Czech Republic

Department of Veterinary Biosciences Faculty of Veterinary and Agricultural Sciences University of Melbourne Victoria Australia

Future Industries Institute University of South Australia Adelaide South Australia Australia

iThree Institute University of Technology Sydney Ultimo NSW Australia

Quadram Institute Norwich UK

San Pathology Sydney Adventist Hospital Wahroonga NSW 2076 Australia

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