design: The genomic DNA extraction was performed by using the QIAsymphony DSP Virus/Pathogen Midi Kit (QIAGEN, Germany), according to the manufacturer's instructions. DNA was quantified by fluorescence, using the Qubit 4.0 fluorometer kit (Invitrogen, Carlsbad, CA, USA). All the strains were sequenced with Illumina MiSeq instrument (San Diego, California, U.S.) after a Nextera XT library preparation.