A rapid method for Candida DNA preparation from sputum, and its clinical application

Area of Science:

• Clinical Microbiology
• Molecular Diagnostics

Background:

• Candida identification in sputum is clinically significant.
• A rapid Candida DNA preparation method with Sputasol pretreatment was evaluated.

Purpose of the Study:

• To assess the feasibility of a rapid Candida DNA preparation method combined with Sputasol pretreatment for detecting Candida in sputum specimens.
• To evaluate the diagnostic performance of duplex polymerase chain reaction (PCR) for Candida detection in sputum.

Main Methods:

• 181 sputum specimens from patients with respiratory diseases were analyzed.
• Sputum samples underwent Sputasol pretreatment and rapid DNA preparation.
• Duplex PCR was used for Candida detection, with results compared to fungal culture.

Main Results:

• 65 out of 181 specimens tested positive for Candida by PCR, versus 32 by fungal culture.
• PCR showed complete consistency with fungal culture for positive samples.
• Moderate agreement (Kappa=0.554) was observed between PCR and fungal culture; higher sensitivity of PCR was noted.

Conclusions:

• The rapid Candida DNA preparation and duplex PCR method is sensitive for Candida detection in sputum.
• Clinical judgment is essential when interpreting PCR results.
• Further studies are required to confirm the clinical utility of this rapid detection method.