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We previously identified foreign travel as a risk factor for acquiring infections due to CTX‐M (active on cefotaxime first isolated in Munich) producing Escherichia coli. The objective of this study was to assess the prevalence of extended‐spectrum β‐lactamase (ESBL)‐producing E coli among stool samples submitted from travelers as compared to non‐travelers (a non‐traveler had not been outside of Canada for at least 6 months before submitting a stool specimen).

Once a travel case was identified, the next stool from a non‐traveler (not been outside of Canada for at least 6 months) was included and cultured on the chromID‐ESBL selection media. Molecular characterization was done using polymerase chain reaction and sequencing for bla_CTX‐Ms, bla_TEMs, bla_SHVs, plasmid‐mediated quinolone‐resistant determinants, O25‐ST131, phylogenetic groups …