Phenotype-driven strategies for screening Candida parapsilosis complex for molecular identification.

Area of Science:

• Medical Mycology
• Microbial Diagnostics

Background:

• The Candida parapsilosis complex comprises cryptic species that are difficult to differentiate using standard methods.
• Accurate identification is crucial for appropriate antifungal treatment and infection control.

Purpose of the Study:

• To evaluate the agreement between phenotypic methods and molecular identification for the Candida parapsilosis complex.
• To identify potential phenotypic markers for differentiating cryptic species within the complex.

Main Methods:

• Molecular identification was used as the gold standard for species identification.
• Phenotypic methods were assessed for their agreement with molecular identification in 59 isolates.
• Growth characteristics under specific conditions (15% NaCl, pH 7.0) were evaluated.

Main Results:

• Phenotypic methods demonstrated >80% agreement with molecular identification for the Candida parapsilosis complex.
• Growth at 15% NaCl or pH 7.0 significantly reduced colony-forming unit counts of Candida orthopsilosis.

Conclusions:

• Phenotypic methods offer a reliable alternative for identifying the Candida parapsilosis complex.
• The tested growth conditions show promise for developing phenotypic methods to differentiate cryptic species like Candida orthopsilosis.