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Carbapenem and colistin antibiotics are often the last-resort treatment for severe infections caused by multidrug-resistant bacteria (1–3). Fortunately, most carbapenemase producers are susceptible to colistin, and many colistin-resistant strains have been reported to be sensitive to carbapenems (2–5). The present study is the first report of a Klebsiella pneumoniae strain LM22-1 harboring blaNDM-1, blaVIM-1, and mcr-9, which was recovered from food in Japan.

Strain LM22-1 was isolated in February 2016 from unfrozen chicken obtained from a local grocer in Higashihiroshima City, Hiroshima, Japan. The chicken sample was confirmed to originate from Japan. The isolate showed resistance to a wide range of antibiotics, including carbapenems, by broth microdilution assay (Table 1)(6). Carbapenemase-producing K. pneumoniae strains are uncommon in Japan but have been documented in Hiroshima hospitals (7 …