Whole genome sequence analysis of ESBL-producing Escherichia coli recovered from New Zealand freshwater sites

Author:

Burgess Sara A.1ORCID,Moinet Marie2,Brightwell Gale32,Cookson Adrian L.21

Affiliation:

1. mEpiLab, School of Veterinary Science, Massey University, Palmerston North 4410, New Zealand

2. AgResearch Ltd, Hopkirk Research Institute, Massey University, Palmerston North 4410, New Zealand

3. New Zealand Food Safety Science and Research Centre, Massey University, Palmerston North, New Zealand

Abstract

Extended-spectrum beta lactamase (ESBL)-producing Escherichia coli are often isolated from humans with urinary tract infections and may display a multidrug-resistant phenotype. These pathogens represent a target for a One Health surveillance approach to investigate transmission between humans, animals and the environment. This study examines the multidrug-resistant phenotype and whole genome sequence data of four ESBL-producing E . coli isolated from freshwater in New Zealand. All four isolates were obtained from a catchment with a mixed urban and pastoral farming land-use. Three isolates were sequence type (ST) 131 (CTX-M-27-positive) and the other ST69 (CTX-M-15-positive); a phylogenetic comparison with other locally isolated strains demonstrated a close relationship with New Zealand clinical isolates. Genes associated with resistance to antifolates, tetracyclines, aminoglycosides and macrolides were identified in all four isolates, together with fluoroquinolone resistance in two isolates. The ST69 isolate harboured the bla CTX-M-15 gene on a IncHI2A plasmid, and two of the three ST131 isolates harboured the bla CTX-M-27 genes on IncF plasmids. The last ST131 isolate harboured bla CTX-M-27 on the chromosome in a unique site between gspC and gspD. These data highlight a probable human origin of the isolates with subsequent transmission from urban centres through wastewater to the wider environment.

Funder

AgResearch

Publisher

Microbiology Society

Subject

General Medicine

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