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Background Elizabethkingia spp. is a non-fermenting, non-motile, oxidase-positive gram-negative aerobic bacilli that is ubiquitous in the environment, found in freshwater, saltwater and soil. Nowadays, they are emerging as nosocomial pathogens. In this study, we analyzed Elizabethkingia spp infected cases clinically and microbiologically. Methods This study was performed to evaluate the risk factors for mortality and to study the impact of microbiologic response on clinical outcomes in patient with Elizabethkingia spp Data on 210 patient of Elizabethkingia pneumonia and bacteremia that have occurred between November 1, 2005, and May 31, 2016, in a teaching hospital (2000 beds) in Seoul, Korea, were analyzed. Furthermore, antimicrobial susceptibility testing of Elizabethkingia from sputum and blood cultures was performed by E test for rifampin, moxifloxacin and vancomycin. Results Among 210 patients, there were 157(74.8%) survivor and 53(25.2%) non-survivor. Among these patients, 129 patients (61.4%) were male and the median age was 66.5 years. There were no significant differences in the Charlson comorbidity index between survivor and non-survivor groups (P = 0.413). In the multivariate logistic regression, microbiologic failure (odds ratio [OR], 7.862; 95% confidence interval [CI], 3.448–17.931; pElizabethkingia infection (OR, 1.032; 95% CI, 1.013–1.051; P = 0.001), previous use of immunosuppressants (OR, 3.309; 95% CI, 1.334–8.210; P = 0.010), and Percutaneous cardiopulmonary support system use at the time of Elizabethkingia infection (OR, 7.439; 95% CI,1.180–46.900; P = 0.033) were significantly associated with 28day mortality. Patients with moxifloxacin-resistant and vancomycin-resistant showed higher mortality rate but no statistically significant difference. Conclusion The early identification of these clinical factors in patients with Elizabethkingia infection is important to improve prognosis Disclosures All authors: No reported disclosures.

489. Risk Factors for Mortality in Patients with Elizabethkingia and Clinical Impact of Antimicrobial Susceptibility Patterns