Treatment of Citrobacter koseri Urinary Tract Infection in Adult Males

Diagnostic Approach

• The European Urology guidelines recommend obtaining urine culture before initiating antibiotic therapy to confirm the causative organism and determine susceptibility patterns, and consider Citrobacter koseri UTI as a complicated UTI in males, as male gender is a complicating factor, and evaluate for underlying urological abnormalities that may complicate treatment 1, 2

First-Line Treatment Options

• The European Urology guidelines recommend ciprofloxacin 500-750 mg twice daily for 7 days as first-line therapy for Citrobacter koseri urinary tract infections in adult males, provided local resistance rates are below 10% 1
• The European Urology and Clinical Infectious Diseases guidelines recommend levofloxacin 750 mg once daily for 5 days as an alternative fluoroquinolone option for Citrobacter koseri urinary tract infections in adult males 1, 3

Alternative Treatment Options

• The European Urology guidelines recommend trimethoprim-sulfamethoxazole 160/800 mg twice daily for 14 days, cefpodoxime 200 mg twice daily for 10 days, and ceftibuten 400 mg once daily for 10 days as alternative treatment options for Citrobacter koseri urinary tract infections in adult males 1
• The European Urology and Journal of Microbiology, Immunology and Infection guidelines recommend aminoglycosides, such as gentamicin 5 mg/kg daily or amikacin 15 mg/kg daily, for multidrug-resistant Citrobacter koseri strains 1, 2

Treatment Duration

• The Clinical Infectious Diseases guidelines recommend a treatment duration of 7 days for patients with prompt symptom resolution, and 10-14 days for patients with delayed response 3, 4
• The European Urology guidelines recommend a treatment duration of 14 days when prostatitis cannot be excluded in male patients 1

Special Considerations

• The Clinical Infectious Diseases guidelines recommend replacing the catheter if it has been in place for ≥2 weeks for catheter-associated UTI caused by C. koseri, and obtaining a new urine culture from the freshly placed catheter 4, 5

Monitoring and Follow-up

• The European Urology guidelines recommend assessing clinical response within 72 hours of treatment initiation, and considering extending treatment duration to 10-14 days or alternative antibiotics based on susceptibility testing if symptoms persist beyond 72 hours 1, 2, 3, 4

Prevention

• The Clinical Infectious Diseases guidelines recommend removing urinary catheters as soon as clinically appropriate to reduce the risk of catheter-associated infections, and addressing any underlying urological abnormalities that may predispose to recurrent infections 1, 3, 4