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Background Bacteremia is a significant cause of morbidity and mortality. Several studies have shown this burden to increase among patients with multidrug resistant (MDR) PSA, and in those treated with inappropriate empiric therapy. Ceftolozane/tazobactam (C/T) is a combination of a novel antipseudomonal cephalosporin and an established β-lactamase inhibitor approved for the treatment of complicated urinary tract infection, complicated intra-abdominal infection and hospital-acquired and ventilator-associated bacterial pneumonia. In the absence of specific bacteremia clinical trial data; the aim of this study is to describe all published evidence relating to C/T for the treatment of Gram negative bacteremia. Methods This SLR includes all published evidence from December 2015 to March 2020 searched via the OVID platform: EMBASE, MEDLINE, and MEDLINE In-Process. In addition, data published (2018-2019) from the European Society of Clinical Microbiology and Infectious Diseases and Infectious Disease Week Congresses were included. Eligible publications were on adult patients treated with C/T reporting any clinical outcome where data were reported specifically for the bacteremia population. Results The SLR identified 1,455 citations, of which 24 publications representing 23 unique studies met eligibility criteria. This included primary and secondary bacteremia. Ten studies included patients with primary bacteremia, only 7 of which reported results specific to primary bacteremia patients. Despite heterogeneity in study design, patient and treatment characteristics, and a lack of detailed reporting; the majority of studies focused on MDR/ extensively drug resistant (XDR) infections (range: 68.3%-100%). Clinical success/ cure ranged from 33%-100%, with 6/7 studies at &amp;gt;85%; 30-day mortality from 0%-67%, with 3/7 studies at 0% (Table 1). Table 1. Clinical Outcomes reported among Primary Bacteremia population(s) Conclusion Although the number of C/T treated patients was small, favorable clinical outcomes were observed, even among highly resistant PSA infections. Heterogeneity was ubiquitous, with diverse and complex patient profiles identified. Further studies where outcomes are stratified by bacteremia status and by timing of C/T treatment are needed. Disclosures Ryan J. Dillon, MSc, Merck &amp; Co., Inc., (Employee) Carisa De Anda, PharMD, Merck &amp; Co Inc, (Employee) Christopher Bruno, MD, Merck &amp; Co., Inc. (Employee) Laura A. Puzniak, PhD, Merck (Employee)

1596. Ceftolozane/tazobactam (Zerbaxa) for the Treatment of Pseudomonas aeruginosa (PSA) Bacteremia: A Systematic Literature Review (SLR)