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This score predicts the probability of extended-spectrum β-lactamase (ESBL) - producing Enterobacteriaceae bloodstream isolates in patients with suspected or confirmed gram-negative bloodstream infections (BSI).
Outpatient procedure within past 30 days of BSI
Outpatient procedures include invasive and non-invasive gastrointestinal and genitourinary procedures.
No β-lactam or fluoroquinolone courses within past 90 days
Short term perioperative antibiotics do not qualify as a course of antibiotics.
Multiple courses of antibiotics have to be at least 3 days apart. Concurrent or sequential therapy is considered one course.
1 β-lactam or fluoroquinolone course within past 90 days
≥ 2 β-lactam or fluoroquinolone courses within past 90 days
Documented colonization with ESBLs within past 12 months