Antimicrobial resistance profiles of diarrhoeagenic Escherichia coli isolated from travellers returning to the UK, 2015-2017

Journal of Medical Microbiology
Megan D BoxallClaire Jenkins

Abstract

Introduction. Diarrhoeagenic Escherichia coli (DEC) are difficult to distinguish from non-pathogenic commensal E. coli using traditional culture methods. The implementation of PCR targeting specific virulence genes characteristic of the five DEC pathotypes, has improved the detection of DEC in faecal specimens from patients with symptoms of gastrointestinal disease.Aim. Antimicrobial resistance (AMR) profiles of 660 strains of DEC isolated between 2015 and 2017 from UK travellers reporting symptoms of gastrointestinal disease were reviewed to look for evidence of emerging AMR associated with travellers' diarrhoea.Methodology. All isolates of DEC were sequenced, and sequence type, serotype, pathotype markers and AMR profiles were derived from the genome data.Results. A travel history was provided for 54.1 % (357/660) of cases, of which 77.0 % (275/357) reported travel outside the UK within 7 days of onset of symptoms, and 23.0 % (82/357) reported no travel in that time frame. Of the 660 strains of DEC in this study, 265 (40.2 %) samples were identified as EAEC, 48 (7.3 %) as EIEC, 61 (9.2 %) were ETEC and 286 (43.3 %) were EPEC. EPEC caused the highest percentage of infections in children (40.6 %) whilst the highest proportion o...Continue Reading

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