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The purpose of this investigation was to describe the first documented carbapenem-resistant Klebsiella pneumoniae (CRKP) outbreak in a tertiary care facility in Saudi Arabia. We initiated a prospective study to follow all cases of CRKP as well as the active surveillance of patients in areas where cases were identified. We also conducted a retrospective review of the microbiology database for any missed cases of CRKP. Pulsed field gel electrophoresis (PFGE) was conducted for the available CRKP isolates. During March 2010, a cluster of eight CRKPs was detected primarily in the adult intensive care unit (ICU). Patients with CRKPs were put under strict contact isolation, along with appropriate infection control measures. A retrospective review of K. pneumoniae isolates over the previous 6 months revealed two more CRKPs. The PFGE results during the outbreak period showed that the majority of strains …