Sequence types (STs) were calculated according to the multilocus sequence typing (MLST) scheme of the Public databases for molecular typing and microbial genome diversity (PubMLST)3 using Ariba v2.6.2 (Hunt et al., 2017 (link)). A simple diversity index (SDI; Gastmeier et al., 2006 (link)) was applied to analyze population diversity. Core genome MLST (cgMLST), consisting of 1861 targets for S. aureus provided by SeqSphere+3.5.0 (Ridom, Münster, Germany), was performed with the 137 sequenced isolates. Additionally, ST398 isolates from this study were analyzed using cgMLST together with a collection of 239 S. aureus of this ST downloaded from the NCBI database using “chromosome” and “complete” as filtering criteria for assembly level and the absence of mec genes as the genotypic criterion.
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