Candida auris Screening in a Simple Setup: Introduction, When to Suspect it, Identification Methods,Confirmatory Identification, and Summary Table
Candida auris colony morphology
Introduction of Candida auris Screening in a Simple Setup
Table of Contents
Candida auris Screening in a Simple Setup is possible to presumptively identify Candida auris in a simple laboratory setup, though definitive identification typically requires advanced methods. In resource-limited or basic clinical microbiology labs, we can still suspect or screen for Candida auris using a combination of culture characteristics, resistance patterns, and simple tests.
Fig. Candida auris colony morphology-Source: CDC
When to Suspect C. auris?
Rapid-growing yeast in high-risk patients (ICU, cancer).
Emerging Multidrug-Resistant Yeast; Candida auris is a rapidly emerging fungal pathogen with resistance to multiple antifungals, including azoles, polyenes, and sometimes echinocandins.
Difficult to Identify in Routine Labs-It is often misidentified as C. haemulonii, C. famata, or C. lusitaniae by conventional systems (e.g., VITEK-2 without updated database).
Causes Invasive Infections: Common infections include candidemia, wound infections, and ventilator-associated pneumonia, especially in ICU and immunocompromised patients.
High Mortality Rates: Mortality from C. auris bloodstream infection ranges from 30% to 60%, particularly in critically ill or cancer patients.
Transmits Person-to-Person: Unlike other Candida species, C. auris spreads nosocomially (via healthcare contact, contaminated surfaces, or devices).
Grows at High Temperature and Salinity: It can grow at 42°C and in 10% NaCl, helping distinguish it from otherCandida species.
No Germ Tube Formation: C. auris is germ tube negative and does not produce pseudohyphae, which helps rule out C. albicans.
Forms Biofilms on Medical Devices: Adheres to catheters, ventilators, and hospital surfaces, making eradication and infection control challenging.
Resistant to Fluconazole: >90% of isolates are resistant to fluconazole; some strains are pan-resistant to all major antifungal classes.
Requires Contact Precautions and Outbreak Control: Identification mandates notification, isolation, surface disinfection, and public health alert due to outbreak potential.
