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Infection caused by Candidozyma auris — Clinical Guidelines

Overview

Candidozyma auris (formerly known as Candida auris) is an emerging fungal pathogen that poses a significant global health threat due to its multidrug resistance, high transmissibility in healthcare settings, and association with substantial mortality rates 2. This yeast primarily affects immunocompromised individuals and those residing in or recently transferred from healthcare facilities, particularly intensive care units (ICUs) and long-term care facilities (LTCFs). Given its resilience and ability to persist on surfaces, C. auris can lead to outbreaks that are challenging to control with conventional infection control measures. Effective management and prevention strategies are crucial in day-to-day clinical practice to mitigate its spread and impact on patient outcomes 2 3 5.

Pathophysiology

The pathophysiology of Candidozyma auris infection involves several key mechanisms that contribute to its clinical manifestations and resistance profile. At the molecular level, C. auris exhibits genetic diversity and possesses mechanisms that confer resistance to multiple antifungal drugs, including echinocandins, which are typically first-line treatments for invasive candidiasis 4. This resistance often stems from mutations in genes encoding for drug targets and efflux pumps that expel antifungals from the fungal cell.

Cellularly, C. auris demonstrates robust adherence properties, allowing it to colonize and persist on both human skin and environmental surfaces, facilitating its transmission within healthcare settings 2. Its ability to form biofilms further enhances its resistance to antifungal agents and host immune defenses, complicating eradication efforts. These factors collectively contribute to the persistent nature of C. auris infections and the challenges in managing outbreaks effectively 2 4.

Epidemiology

Candidozyma auris has shown increasing incidence and prevalence globally, particularly in regions with high healthcare utilization and immunocompromised populations. While precise global figures vary, endemic areas have reported significant clusters, notably in South Asia, the Middle East, and parts of Europe and the Americas 4 5. The pathogen disproportionately affects elderly patients and those with underlying conditions such as hematological malignancies, prolonged ICU stays, and those requiring invasive medical devices like central lines and ventilators 2 3. Geographic hotspots often correlate with healthcare infrastructure challenges and inadequate infection control practices, highlighting the need for targeted surveillance and intervention strategies 4.

Clinical Presentation

Clinical presentations of Candidozyma auris infections can range from asymptomatic colonization to severe invasive disease, depending on the patient's immune status and the site of infection. Common manifestations include bloodstream infections, urinary tract infections, wound infections, and ear infections (otitis), particularly in neonates and elderly patients 2. Red-flag features include persistent fever unresponsive to antibiotics, signs of sepsis, and recurrent or unexplained infections in healthcare settings. Patients may also exhibit skin lesions or mucosal involvement, especially in those with prolonged ICU stays or those cohorted due to suspected colonization 2 3.

Diagnosis

Diagnosing Candidozyma auris requires a systematic approach combining clinical suspicion with specific diagnostic tests. Initial suspicion often arises from epidemiological risk factors such as recent hospitalization abroad, prolonged ICU stays, or exposure to endemic areas. The definitive diagnostic methods include:

Culture: Bilateral axilla and groin swabs are commonly used, though anterior nares and hands composite samples have shown improved consistency 7.

Molecular Testing: Polymerase Chain Reaction (PCR) offers rapid and sensitive detection, particularly useful for early identification and monitoring 3 5.

Specific Criteria and Tests:

Swab Collection: Bilateral axilla and groin swabs; alternatively, anterior nares and hands composite samples.

PCR Testing: Positive PCR result confirms colonization or infection.

Culture Confirmation: Positive culture from clinical samples, typically requiring 7-14 days for definitive identification.

Differential Diagnosis: Distinguish from other Candida species using MALDI-TOF MS or molecular methods; consider bacterial infections or other fungal pathogens based on clinical context 2 3.

Differential Diagnosis

Other Candida Species: Differentiated primarily through molecular methods like MALDI-TOF MS or PCR.

Bacterial Infections: Clinical presentation and Gram stain can help differentiate; blood cultures may be necessary.

Aspergillosis: Typically seen in immunocompromised patients with respiratory symptoms; confirmed via sputum cultures and histopathology 2.

Management

First-Line Treatment

Echinocandins: Micafungin (70 mg/day IV), Anidulafungin (200 mg IV every 24 hours), Caspofungin (70 mg loading dose followed by 50 mg/day IV).

Monitoring: Regular clinical assessment, serial blood cultures, and monitoring for adverse effects such as infusion-related reactions.

Specifics:

Dose and Duration: Adjust based on patient response and renal function.

Contraindications: Hypersensitivity to echinocandins, severe hepatic impairment.

Second-Line Treatment

Flucytosine: 50 mg/kg IV every 6 hours, often combined with echinocandins.

Amphotericin B: Deoxycholate (0.6-1.0 mg/kg/day IV) or lipid formulations (3-5 mg/kg/day IV).

Specifics:

Dose and Duration: Tailored to patient tolerance and renal function.

Monitoring: Renal function, electrolyte levels, and monitoring for infusion-related reactions.

Refractory Cases

Consultation: Infectious disease specialist for tailored therapy.

Considerations: Combination therapy, alternative antifungal agents based on resistance patterns identified through susceptibility testing.

Specifics:

Specialized Testing: Antifungal susceptibility testing to guide therapy.

Referral: Early referral to specialists for complex cases.

Complications

Mortality: High rates in critically ill patients, particularly those with bloodstream infections.

Secondary Infections: Increased risk of secondary bacterial infections due to immunosuppression from antifungal therapy.

Persistent Colonization: Difficulty in eradicating colonization, leading to recurrent infections.

Management Triggers:

Persistent Fever: Consider re-evaluation for secondary infections.

Clinical Deterioration: Immediate consultation with infectious disease specialists.

Outbreaks: Enhanced infection control measures and environmental decontamination.

Prognosis & Follow-Ups

The prognosis for Candidozyma auris infections varies widely based on the patient's immune status and the severity of the infection. Prognostic indicators include rapid diagnosis, appropriate antifungal therapy initiation, and effective infection control measures. Recommended follow-up intervals include:

Clinical Monitoring: Weekly assessments for the first month, then biweekly.

Laboratory Testing: Serial PCR or culture to monitor clearance of colonization.

Environmental Surveillance: Periodic screening of high-risk areas and surfaces in healthcare settings.

Special Populations

Pediatrics: Higher susceptibility due to immature immune systems; close monitoring and early intervention crucial.

Elderly: Increased risk of severe infections and complications; tailored infection control measures necessary.

Immunocompromised Patients: Higher likelihood of invasive disease; aggressive diagnostic and therapeutic approaches required.

Geographic Risk Groups: Enhanced surveillance in endemic regions; targeted screening protocols for recent travelers or residents 2 3 5.

Key Recommendations

Implement Enhanced Screening Protocols: Use electronic admission screening tools to identify high-risk patients for C. auris colonization (Evidence: Strong 5).

Adopt Scenario-Based Infection Control: Tailor control measures to specific clinical settings (ICU, LTCF, surgical wards, outpatient) (Evidence: Moderate 2).

Utilize Composite Sampling Methods: Employ anterior nares and hands for more consistent colonization screening (Evidence: Moderate 7).

Initiate Early Antifungal Therapy: Start echinocandins as first-line treatment for suspected or confirmed invasive C. auris infections (Evidence: Strong 2).

Strengthen Environmental Hygiene: Implement rigorous cleaning and disinfection protocols, especially in high-risk areas (Evidence: Moderate 2).

Promote Interdisciplinary Collaboration: Ensure continuous quality improvement through collaboration between clinicians, infection preventionists, and public health officials (Evidence: Expert opinion 6).

Monitor and Report Outbreaks: Actively monitor for and report C. auris cases to facilitate timely public health responses (Evidence: Moderate 4).

Educate Healthcare Workers: Regular training on C. auris recognition, prevention, and management practices (Evidence: Expert opinion 2).

Screen Transferred Patients: Perform targeted screening for patients transferred from endemic areas to non-endemic wards (Evidence: Moderate 3).

Adapt Screening Phases: Implement a phased approach to screening and isolation based on risk criteria (Evidence: Moderate 6).

References

1 Han Q, Chen X, Huang H, Li Y. Qualitative discrimination of common phenolic disinfectants by sensor array based on nanozymes for facile environmental sensing. Analytica chimica acta 2026. link 2 Ji J, Xu W, Chen Y. Tackling a global threat: a clinical scenario-based framework for preventing and managing Candidozyma auris infections. Frontiers in cellular and infection microbiology 2026. link 3 Mezzogori L, Bavastro M, Magnasco L, Centorrino F, Schiavoni R, Portunato F et al.. Testing to Detect Candida auris Colonisation After Intrahospital Transfer From an Endemic Area, a Prospective Observational Study. Mycoses 2026. link 4 Tomé LMR, Camargo DRA, Bastos RW, Dos Santos SCF, Guimarães NR, Pedroso SHSP et al.. Emergence of Candida (Candidozyma) auris in Minas Gerais, Brazil: Genomic Surveillance to Guide Rapid Public Health Responses. Mycoses 2026. link 5 Jimenez A, Rosa R, Jean N, Flanagan A, Manzanillo K, Rosello G et al.. Development and implementation of an electronic admission-screening tool for Candidozyma auris (formerly Candida auris) at a large healthcare system in Miami, FL, USA. The Journal of hospital infection 2026. link 6 Wentland West A, Macsay E, Snure KJ, Northern WI. A phased approach to implementation of a Candida auris screening program in a large, acute care hospital system. American journal of infection control 2026. link 7 López LF, Arenas S, Jimenez A, Ferreira TBD, Parekh DJ, Bracho Rincon O et al.. Improved Consistency of Candida auris Colonization Screening With an Anterior Nares and Hands Composite Sample. Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2026. link

Infection caused by Candidozyma auris

Overview

Pathophysiology

Epidemiology

Clinical Presentation

Diagnosis

Differential Diagnosis

Management

First-Line Treatment

Second-Line Treatment

Refractory Cases

Complications

Prognosis & Follow-Ups

Special Populations

Key Recommendations

References

Original source