Escherichia coli prophage sequences are not present in a carbapenemase plasmid from Klebsiella. Reply to Authors' response to Letter to the Editor: If extraordinary data are not first corroborated, we risk being led astray: Occam's razor does not support the existence of plasmid-prophage chimeras. Comment on 'Effects of cryptic prophage regions in a plasmid carrying a carbapenemase gene on survival against antibiotic stress'.