A nosocomial outbreak due to novel CTX-M-2-producing strains of Citrobacter koseri in a hematological ward

Tsuyoshi Muta*, Nobuko Tsuruta, Yumiko Seki, Rika Ota, Satowa Suzuki, Naohiro Shibata, Koji Kato, Tetsuya Eto, Hisashi Gondo and Yoshichika Arakawa Department of Hematology, Department of Respiratory Disease and Department of Clinical Microbiology, Hamanomachi Hospital, Fukuoka 810-8539, and Department of Bacterial Pathogenesis and Infection Control, National Institute of Infectious Diseases, Tokyo 208-0011, Japan