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Difficulty: EasyInfectious Diseases

A 76-year-old woman is evaluated in the clinic for a routine wellness visit. She resides in an assisted living facility and has no acute complaints. Her medical history is notable for hypertension, osteoarthritis, and well-controlled type 2 diabetes mellitus. Vital signs are within normal limits. She specifically denies dysuria, urinary frequency, urgency, or suprapubic pain. A screening urinalysis obtained by the facility staff prior to the visit reveals trace leukocyte esterase, positive nitrites, and 15-20 white blood cells/hpf. A subsequent urine culture grows >105>10^5 CFU/mL of *Escherichia coli*. Which of the following is the most appropriate next step in management?

  1. Reassurance and clinical observationAnswer
  2. B
    Prescription for oral ciprofloxacin
  3. C
    Prescription for oral nitrofurantoin
  4. D
    Prescription for oral fosfomycin
  5. E
    Repeat urine culture in one week

Answer

Reassurance and clinical observation
The correct answer is reassurance and clinical observation. This patient has asymptomatic bacteriuria, defined as the presence of ≥105\geq 10^5 CFU/mL of bacteria in the urine of a patient who lacks symptoms of a urinary tract infection. In non-pregnant adults—including elderly individuals, residents of long-term care facilities, and patients with diabetes mellitus—asymptomatic bacteriuria is highly prevalent and should not be treated with antibiotics. Treatment does not decrease the incidence of future symptomatic infections or improve survival; instead, it unnecessarily exposes the patient to adverse drug effects and promotes antimicrobial resistance.

Step-by-Step Solution

1
Evaluate the clinical presentation alongside the laboratory findings.
The patient is an elderly female with a positive urinalysis and urine culture, but absolutely no symptoms of a urinary tract infection.
Establishing the presence or absence of symptoms is critical for distinguishing between an active infection and colonization.
2
Identify the clinical diagnosis.
The findings define asymptomatic bacteriuria.
Asymptomatic bacteriuria is defined as ≥105\geq 10^5 CFU/mL of bacteria in the urine of an individual without signs or symptoms of a genitourinary tract infection.
3
Determine the appropriate management protocol.
Observation without antimicrobial therapy is selected.
Guidelines explicitly recommend against screening for or treating asymptomatic bacteriuria in non-pregnant adults, including the elderly and diabetic patients, to prevent antibiotic resistance and avoid adverse drug events.

Key Concept

Management of asymptomatic bacteriuria in non-pregnant older adults
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Topics

Infectious Diseases

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