Empiric antibiotic selection and infectious disease management scenarios tested on USMLE Step 2 CK.
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- What is the first-line empiric antibiotic for a healthy outpatient with community-acquired pneumonia and no comorbidities?
- Amoxicillin
- Empiric antibiotic regimen for outpatient CAP in a patient with comorbidities (heart, lung, liver, or renal disease, diabetes, or alcoholism)?
- Amoxicillin-clavulanate plus a macrolide (or a respiratory fluoroquinolone alone)
- Empiric antibiotic regimen for a patient hospitalized with CAP on a general medical floor (non-ICU)?
- A beta-lactam plus a macrolide
- Empiric antibiotic regimen for a patient with CAP admitted to the ICU?
- A beta-lactam plus either azithromycin or a respiratory fluoroquinolone
- Compared to community-acquired pneumonia, empiric therapy for hospital-acquired or ventilator-associated pneumonia must also cover ____.
- Pseudomonas aeruginosa
- First-line oral antibiotic for uncomplicated acute cystitis in a nonpregnant woman?
- Nitrofurantoin
- First-line empiric antibiotic for outpatient treatment of acute pyelonephritis?
- An oral fluoroquinolone (e.g., ciprofloxacin)
- First-line empiric antibiotic for a patient hospitalized with severe pyelonephritis?
- IV ceftriaxone
- In a previously healthy adult under age 50 with suspected bacterial meningitis, empiric therapy is ____.
- vancomycin plus ceftriaxone
- What antibiotic is added to the standard meningitis regimen in patients over age 50?
- Ampicillin, to cover Listeria monocytogenes
- Empiric antibiotic regimen for suspected bacterial meningitis in a neonate?
- Ampicillin plus cefotaxime
- When should dexamethasone be given relative to antibiotics in suspected bacterial meningitis?
- Just before or together with the first dose of antibiotics
- Empiric antibiotic regimen for suspected septic (bacterial) arthritis before culture results return?
- Vancomycin plus ceftriaxone
- Empiric antibiotic regimen for necrotizing fasciitis?
- Vancomycin plus piperacillin-tazobactam plus clindamycin
- Why is clindamycin included in the treatment regimen for necrotizing fasciitis and toxic shock syndrome?
- It suppresses bacterial exotoxin production