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Background Antimicrobial stewardship interventions to decrease testing and treatment of asymptomatic bacteriuria (ASB) have primarily focused on inpatient clinicians, however emergency medicine (EM) clinicians also test and treat ASB. We identified testing attributable to EM clinicians and patient-level factors associated with EM treatment of ASB. Methods Between November 2017 and March 2019, data were abstracted from medical records of adult non-ICU medical patients at 43 Michigan hospitals admitted through the Emergency Department (ED) with a positive urine culture (Ucx) collected on day 1 or 2 of hospitalization. Exclusions included pregnancy, urologic surgery or abnormality, immune-compromise, severe sepsis, or concomitant infection. ASB was defined as a positive Ucx without signs or symptoms of a urinary tract infection (UTI). The treatment group included patients receiving ≥1 antibiotic dose ordered by an EM clinician. Patient factors associated with ASB treatment by EM clinicians vs. no treatment were evaluated using logistic generalized estimating equation models. Results Of 1,778 patients with ASB, 74.7% (N = 1328) had a Ucx ordered by an EM clinician (Figure 1), and 74.4% (N = 1323) were treated with antibiotics (Figure 2). Of those treated for ASB, 64.3% (851/1328) had the first dose ordered by an EM clinician (Figure 2). Patient variables associated with EM treatment included nonambulatory status, incontinence, presence of a urinary catheter, acutely altered mental status (AMS), leukocytosis, and positive urinalysis (Table 1). When EM initiated treatment, most patients (80%) remained on antibiotics for ≥3 days (Figure 3), with a median treatment duration of 6 days [IQR 4–9]. Conclusion Among patients with ASB admitted through the ED with a Ucx collected on day 1 or 2 of hospitalization, most were treated with antibiotics. The majority of testing and initial treatment for ASB was by EM clinicians. The strongest predictors of EM treatment of ASB were positive urinalysis and AMS. Once started by EM, patients often received a full course for UTI. Given the burden of ASB testing and treatment, expanding stewardship into the ED is critical and should start with addressing interpretation of urinalyses in patients without specific urinary symptoms. Disclosures All authors: No reported disclosures.

1083. Risk Factors Associated with Treatment of Asymptomatic Bacteriuria in the Emergency Department: A Multi-Hospital Cohort Study