design: Genomic DNA libraries are prepared using the Nextera XT Library Prep Kit (Illumina, San Diego, USA) according to the manufacturers protocol, with the following modifications: the input DNA is increased 2-fold, and the PCR elongation time is increased to 45 seconds. DNA quantification and library preparation are carried out on a Hamilton Microlab STAR automated liquid handling system (Hamilton Bonaduz AG, Switzerland). Libraries are sequenced on an Illumina NovaSeq 6000 (Illumina, San Diego, USA) using a 250 bp paired-end protocol.Reads are adapter trimmed using Trimmomatic version 0.30 with a sliding window quality cutoff of Q15. De novo assembly is performed on samples using SPAdes version 3.7, and contigs are annotated using Prokka 1.11.