Whole-genome sequencing analysis of a rare Salmonella diarizonae clinical strain carrying multiple plasmids and novel gene cassettes

•Genome sequencing of a S. diarizonae clinical strain S499.•S. diarizonae S499 carried two MDR plasmids.•Triplication of a novel gene cassette containing blaCTX-M-55 and blaTEM-1 in one locus.•IS26-mediated repeat insertion of the novel gene cassette in two plasmids.