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Background: The prevalence of extended-spectrum β-lactamase producing Enterobacteriaceae (ESBL-E) is increasing worldwide. ESBL-E are known to colonize different body sites and cause bloodstream infections (BSI), pneumonia, intra-abdominal infections and urinary tract infections. Even though ESBL-E-related morbidity and mortality in high-risk patients – patients receiving immunosuppressants or chemotherapy, as well as those treated in an ICU – is considerable, the management of ESBL-E in these populations has not been systematically reviewed. Methods: For the purpose of this review, ICU patients, patients in hematology and oncology wards and transplant recipients were considered high-risk. An English-language Medline search was conducted to identify literature on epidemiology, risk factors, clinical impact and measures of infection control regarding ESBL-E in high-risk patients published …