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Abstract Background Evidence surrounding outcomes with the North American pulsed-field gel electrophoresis type 1 (NAP1) Clostridium difficile (CDI) strain remains conflicting. We compared risk factors, severity of illness, and mortality of patients infected with NAP1 strain compared with patients with non-NAP1 strains in our multihospital health system. Methods This is a retrospective case–control analysis of patients admitted to one of five hospitals (one academic and four community hospitals) and diagnosed with CDI from April 2014 through July 2017. CDI definition included three or more stools per day with positive stool sample polymerase chain reaction (PCR) testing for C. difficile. Results A total of 490 patients met inclusion, of which 155 had the NAP1 strain and 335 patients were infected with non-NAP1 strains. More patients with NAP1 were older, female, had CHF, and presented from a healthcare facility as opposed to from the community (all P < 0.05). No difference in 90-day antibiotic class use was found. NAP1 patients had increased ICU admission (12.3 vs. 6.0%, P = 0.016), a shorter length of stay (10.8 vs. 13.4 days, P = 0.037), abnormal CT findings (P < 0.023), and trend toward more ID consults (P = 0.067). Per IDSA classification, 61.9% in the NAP1 CDI group had severe CDI as opposed to 49.6% in the non-NAP1 study group. (P ≤ 0.038). There was no observed difference in inpatient mortality (7.7 vs. 5.7%, P = 0.381). Conclusion CDI caused by NAP1 strain did result in increased severity but did not result in increased mortality compared with CDI caused by non-NAP1 strains. Evidence continues to mount that while the NAP1 strain may affect severity, its effect on mortality remains in question. Disclosures All authors: No reported disclosures.

1120. Clostridium difficile Infection Risk Factors, Severity, and Outcomes in Patients Infected with NAP1/027 Strain in a Non-Epidemic Setting