Do you treat Candida (fungus) in the urine with a colony-forming unit (CFU) count less than 10 to the fifth in a patient with asymptomatic candiduria (fungal infection of the urine)?

Treatment of Candiduria with CFU <10⁵

Do not treat asymptomatic candiduria with colony counts less than 10⁵ CFU/mL in most patients, as this almost always represents benign colonization rather than infection and treatment does not improve mortality or clinical outcomes. 1

When Treatment is NOT Indicated

The IDSA guidelines are clear that asymptomatic candiduria does not require antifungal therapy in the vast majority of patients, regardless of colony count 1:

• Candiduria progresses to candidemia in less than 5% of cases 1
• Treatment does not reduce mortality rates in asymptomatic patients 1
• Candiduria serves as a marker of illness severity rather than a cause of morbidity itself 1
• Colony counts should not be used to differentiate colonization from infection in asymptomatic patients 1

First-Line Non-Pharmacologic Management

Before considering any antifungal therapy 1, 2:

• Remove indwelling urinary catheters if present - this alone clears candiduria in approximately 50% of cases without any antifungal therapy 1, 2
• Discontinue unnecessary broad-spectrum antibiotics 3
• Address any underlying urinary tract abnormalities or obstruction 1

High-Risk Exceptions Requiring Treatment Despite Being Asymptomatic

Treatment is mandatory in these specific populations, even with low colony counts and no symptoms 1, 4:

• Neutropenic patients with persistent unexplained fever and candiduria 1
• Very low birth weight neonates - at high risk for invasive candidiasis involving the urinary tract 1
• Patients undergoing urologic procedures or instrumentation - at high risk for candidemia 1, 4
• Patients with urinary tract obstruction 1

Treatment Regimen for High-Risk Asymptomatic Patients

When treatment is indicated in the above populations 1, 4:

• Fluconazole 200-400 mg (3-6 mg/kg) daily for several days before and after urologic procedures 1
• Fluconazole 200 mg (3 mg/kg) daily for 2 weeks for other high-risk scenarios 1, 5

When Symptoms Are Present

Any patient with urinary symptoms (dysuria, frequency, urgency, flank pain, fever) requires treatment regardless of colony count 1:

• Symptomatic cystitis: Fluconazole 200 mg (3 mg/kg) daily for 2 weeks 1, 4, 5
• Symptomatic pyelonephritis: Fluconazole 200-400 mg (3-6 mg/kg) daily for 2 weeks 1, 4

Alternative Agents for Fluconazole-Resistant Species

For fluconazole-resistant C. glabrata 1:

• Amphotericin B deoxycholate 0.3-0.6 mg/kg IV daily for 1-7 days 1
• Oral flucytosine 25 mg/kg four times daily for 7-10 days (alone or combined with amphotericin B) 1

Critical Pitfalls to Avoid

• Do not treat asymptomatic candiduria reflexively - most cases represent benign colonization 1
• Do not assume diabetes mellitus or advanced age alone mandates treatment - these are risk factors for candiduria but not indications for treatment in asymptomatic patients 1, 4
• Do not use echinocandins or other azoles (besides fluconazole) for urinary tract Candida infections - these agents achieve minimal urinary concentrations and are ineffective 4, 2
• Do not use lipid formulations of amphotericin B - they do not achieve adequate urine concentrations 4
• Do not overlook the possibility of disseminated candidiasis in high-risk patients with candiduria 1