Recurrent isolation of an uncommon yeast, Candida pararugosa, from a sarcoma patient

Area of Science:

• Medical Mycology
• Clinical Microbiology
• Molecular Diagnostics

Background:

• Yeast infections can pose risks, especially in immunocompromised patients.
• Accurate identification of yeast species is crucial for effective treatment.
• Candida maris is a rarely identified yeast species.

Observation:

• A yeast initially identified as Candida maris was isolated from a sarcoma patient's saliva.
• The patient's mother and clinic staff predominantly harbored Candida albicans.
• Phylogenetic analysis revealed the patient's yeast was not closely related to Candida maris.

Findings:

• The patient's yeast isolate was phylogenetically identified as Candida pararugosa through ribosomal DNA sequencing.
• DNA reassociation studies confirmed the patient's isolates were conspecific with Candida pararugosa.
• The exact source of the yeast infection could not be determined.

Implications:

• This case highlights the importance of precise yeast identification beyond initial assessments.
• Unexpected environmental microorganisms can cause infections or colonization in immunocompromised individuals.
• Healthcare facilities must remain vigilant about potential environmental contamination and unusual pathogens.