DNA extracted from the two Swedish STEC strains was analyzed using the Ion Torrent S5 XL platform (Thermo Fisher Scientific, Waltham, Massachusetts, USA) as previously described [11 (link)]. The sequencing reads were de novo assembled with Spades (v3.13.1) [12 (link)] in “careful mode” to correct mismatches. The Danish strain was sequenced using an Illumina Nextseq (Illumina, San Diego, CA, USA) as previously described [13 (link)]. The sequencing reads were de novo assembled with SKESA (version 2.3.0) with default settings [14 (link)].
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