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Background Delafloxacin (DLX) is a fluoroquinolone, approved in the United States for treatment of ABSSSI. DLX has no preclinical signals for QT prolongation and has no QT prolongation in a validated challenge study. Risk of QT prolongation is a consideration in antibiotic selection for elderly hospitalized CABP patients. A Phase 3 CABP trial with DLX was analyzed with a focus on age and gender. Methods Data on age and gender were reviewed from a multicenter, randomized, double-blind trial of adults with CABP. Patients were randomized 1:1 to DLX or moxifloxacin (MOX) treatment for 5–10 days. Patients received a minimum of 3 days of IV treatment, then were switched to oral at MD discretion. A key clinical endpoint was the investigator-assessment at Test of Cure (TOC) 5–10 days after the end of treatment. Clinical success was defined as complete or near resolution of signs and symptoms and no further antibiotics needed Results In the overall study, 859 patients were randomized with a mean age of 60 years (55.5% &lt;65, 44.5% ≥65, 21.2% ≥75; range 18–93); 58.7% were male; 25.4% and 1.4% were PORT class IV and V; 28.6% multi-lobar pneumonia. Table shows the comparison of DLX and MOX clinical response at TOC in the Intent to Treat (ITT) population. Overall, DLX was well tolerated, with similar related adverse events (AE) between treatment groups regardless of age (&lt; 65: 16.7% DLX, 13.3% MOX; ≥ 65: 13.4% DLX, 11.7% MOX) or gender (male: 16.0% DLX, 11.1% MOX; female 14.0% DLX, 14.9% MOX). The most common treatment-related AEs for DLX were diarrhea and transaminase elevations which were mild-to-moderate and did not routinely lead to discontinuation. There were no reports of potential QT prolongation on DLX. Conclusion Based on age and gender, DLX had comparable outcomes to MOX in clinical success at TOC. DLX was also well tolerated regardless of age or gender. DLX may offer a promising alternative in the treatment of CABP including elderly patients. Disclosures All authors: No reported disclosures.

2234. Outcomes by Age and Gender from a Global Phase 3 Study of Delafloxacin (DLX) in Community-Acquired Bacterial Pneumonia (CABP)