show Abstracthide AbstractIn this study, we investigated molecular epidemiological characteristic of IMP-1-producing E. cloacae complex from 3 hospitals in Tokyo, Japan between 2007 and 2011. Phylogenetic tree of core-genome SNPs analysis of IMP-1-producing E. hormaechei ST78 showed that these isolates spread not only as intrahospital outbreak but also as regional transmission in Tokyo.