2689. Stenotrphomonas maltophilia, The Hidden Threat Among Pediatric Cancer Patients

BACKGROUND: Stenotrophomonas maltophilia is an emerging nosocomial pathogen in immunocompromised patients. Although S. maltophilia exhibits limited pathogenicity in immunocompetent hosts, it has been shown to cause fatal infections in patients with malignancies. The objective of this study to analyze the clinical characteristics, susceptibility pattern, and treatment outcome of S. maltophilia among pediatric cancer patients. METHODS: Retrospective analysis including all pediatric cancer patients treated at children cancer hospital Egypt (CCHE) with S. maltophilia bloodstream infection from June 2013 till June 2018. RESULTS: 281 isolates among 135 pediatric cancer patients. Most are hematological malignancies 67(50%), solid tumors 55 (40%) and post-transplant 13(10%). Most common hematological malignancies were acute lymphoblastic leukemia 34 patients (25%) while brain tumor was the most common solid tumors 20 patients (15%). The spectrum of infections includes bacteremia in 61 patients (45%) catheter-related in 34 (25%), pneumonia in 22 (16%), skin and soft-tissue infection in 11(8%) meningitis in 5 (3%) and disseminated infections with multiorgan involvement in 4(3%) patients. 46 patients (34%) was admitted in intensive care unit (ICU), 67 inpatient (50%), 11 (8%) stem cell transplant unit and 11 patient (8%) from emergency and outpatient department. The isolates revealed 80% susceptibility to Trimethoprim-Sulfamethoxazole (TMP-SMX), 77% to ciprofloxacin, 50% to cefepime and ceftazidime, 63% to amikacin, 48% to piperacillin–tazobactam, 93% to colistin, 97% to tigecycline. Day 30 mortality (Crude mortality rate) 33 patients (25%) while S. maltophilia attributable mortality (died within 7 days of culture isolation) was 17 patients (13%). Patients with pneumonia, (TMP-SMX) resistance and ICU admission were associated with a significant risk of mortality. CONCLUSION: Stenotrphomonas bloodstream is a serious pathogen and hidden threat among pediatric cancer patients associated with high mortality rate. DISCLOSURES: All authors: No reported disclosures.