Draft genome sequences of three European laboratory derivatives from enterohemorrhagic Escherichia coli O157:H7 strain EDL933, including two plasmids

Escherichia coli O157:H7 EDL933, isolated in 1982 in the United States, was the first enterohemorrhagic E. coli (EHEC) strain sequenced. Unfortunately, European labs can no longer receive the original strain. We checked three European EDL933 derivatives and found major genetic deviations (deletions, inversions) in two strains. All EDL933 strains contain the cryptic EHECplasmid, not reported before.