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Background Burkholderia cepacia complex (Burkholderia cenocepacia and Burkholderia multivorans) (BCC) are uncommon, yet serious often drug-resistant pathogens of immunocompromised patients, especially in lung transplants; pre-operative infection/colonization is seen as a contraindication to transplant. Optimal treatment for these difficult infections is not known. We examined impact of single vs. combination therapy on patient outcomes. Methods All cases of BCC positive pulmonary or blood cultures at The Ohio State University Wexner Medical Center between January 1, 2012 and June 30, 2018 were analyzed. No cystic fibrosis patients were included. All combinations thereof were evaluated. The primary outcomes were 30 all-cause mortality and 30-day infection-related mortality. Secondary outcomes included sterilization of cultures, isolation of a non-susceptible isolate within 30 days of therapy, hospital and intensive care unit (ICU) length of stay, and adverse drug effects (ADE) of therapy including: hyperkalemia, acute kidney injury (AKI), transaminitis, and QTc prolongation. Results There were 90 unique patients who grew BCC (22 patients with 92 positive blood cultures; 54 patients with 87 positive pulmonary cultures). Four patients had mixed pulmonary and blood cultures. Ten patients died prior to having treatment for their cultures and were not evaluated. Overall, there were 85 evaluable infection events. Overall 30-day all-cause mortality was 20/85 (23.5%); mortality in blood culture monotherapy 3/14 (21.4%); combination therapy 3/18 (16.7%) (P = 1.00). Mortality in pulmonary culture monotherapy was 6/32 (18.75%); combination 10/30 (33.3%) (P = 0.19). Among blood cultures monotherapy was associated with 8 ADE while combination therapy was 11 (P = 0.82). In pulmonary patients, monotherapy had 16 ADE while combination had 23 (P = 0.03). Conclusion Overall mortality trends improved with combination therapy in blood culture patients and with monotherapy patients in pulmonary cultures. These findings are influenced by the limited number of patients available, and the medical co-morbidities of these patients. In lung patients there were significantly fewer ADE associated with monotherapy as opposed to combination therapy. Disclosures All authors: No reported disclosures.

2265. Clinical Outcomes with Single vs. Combination Antibiotic Therapy in the Treatment of Burkholderia cepacia complex Bacteremia and Pneumonia