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Background With the emergence of carbapenem-resistant strains of Enterobacteriaceae, non-carbapenem antibiotics are suggested as the alternative treatment of extended-spectrum β-lactamase (ESBL) producing Enterobacteriaceae infection. In this study, efficacy of non-carbapenem antibiotics on acute pyelonephritis (APN) with ESBL-producing Enterobacteriaceae was compared with that of carbapenems. Methods The medical records of patients who had diagnosed to have acute pyelonephritis with ESBL-producing Enterobacteriaceae on their urine culture, from January 2011 to December 2018, were reviewed retrospectively. Patients were classified as carbapenem and non-carbapenem group according to the definitive antibiotics they had treated with. Results Total number of patients was 141, including 112 (79.4%) who had received carbapenem, and 29 (20.6%) received non-carbapenem as definitive therapy against to APN with ESBL-producing Enterobacteriaceae. The duration of hospitalization was shorter for non-carbapenem group (median 9.93 days) than for carbapenem group (median 14.39 days) (P &lt; 0.001). The duration of negative conversion of culture was shorter for carbapenem group (median 40.73 hours) than for non-carbapenem group (median 56.79 hours). There was no significant difference in time to febrile period and duration of definitive therapy between two groups. Conclusion Non-carbapenem therapy against APN with ESBL-producing Enterobacteriaceae has no significant difference in clinical outcome compared with carbapenem therapy. Disclosures All authors: No reported disclosures.

1452. Is Carbapenem-Sparing Therapy as Effective as Carbapenems Against Extended-Spectrum β-Lactamase Producing Enterobacteriaceae in UTI?