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Background There are limited data describing carbapenem-resistant Enterobacteriaceae (CRE) from the Arabian Gulf region. Our aims were to describe the clinical, microbiological and molecular characteristics of CRE infections and to characterize the gene displaying resistance to carbapenem. Methods Retrospective and prospective review of clinical, microbiological and molecular characteristics of CRE isolated between April 2015 and November 2017 at 7 tertiary hospitals in Qatar. Susceptibility testing was performed and interpreted according to Clinical Laboratory Standards Institute methodology and breakpoints. Carbapenemase genes were identified using PCR. Whole-genome sequencing followed by bioinformatics analysis was performed on a subset of samples for accurate detection of resistant genes. SPSS V.21.0 was used for all statistical analyses. Results A total of 144 nonrepeating CRE strains were recovered from 137 individuals over the study period, of which 35 (24.3%) represented colonization. Klebsiella spp. (98, 68.1%) and E. coli (38, 26.4%) were the most predominant. The most prevalent carbapenemases were NDM (69, 47.9%), OXA-48 (36, 25.0%), and KPC (15, 10.4%). Sixteen (11.1%) strains possessed multiple carbapenemase genes but none were detected in 37 (25.7%) strains. Genomic analysis also detected the presence of NDM-7, NDM-5, NDM1, VIM4, and OXA48-like carbapenemase genes among 34 clinical samples. The majority of the strains were susceptible to tigecycline (124, 86.1%), fosfomycin (122, 84.7%) and amikacin (102, 70.8%). There were 109 CRE infections involving the urinary tract (40, 36.7%), bloodstream (31, 28.4%), and respiratory tract (17, 15.6%). Fifty-seven (52.3%) were males and the median age was 57 years (range 3–97). Baseline comorbidities included diabetes (57, 52.3%), chronic kidney disease (27, 24.8%), and cancer (27, 24.8%) (Table 1). Within the 30 days preceding CRE infection, 38 (34.9%) had received carbapenem therapy, 65 (59.6%) had undergone invasive procedures and 33 (30.3%) had had surgery. All-cause 30-day mortality was 29.4%. The only variable independently associated with mortality was baseline SAPS Score (Table 2). Conclusion NDM and OXA-48 are the predominant carbapenemases in Qatar. CRE infections are associated with high overall mortality. Disclosures All authors: No reported disclosures.

630. Clinical and Molecular Characteristics of Carbapenem-Resistant Enterobacteriaceae in Qatar: A Retrospective and Prospective Observational Study