In this study we have sequenced genomes across the genus Serratia, including from strains isolated and published in the 1970s-90s, alongside more contemporary clinical isolates. This data is part of a pre-publication release. For information on the proper use of pre-publication data shared by the Wellcome Trust Sanger Institute (including details of any publication moratoria), please see http://www.sanger.ac.uk/datasharing/