ABSTRACT
Background The incidence of invasive mycoses is increasing worldwide. PCR-RFLP was applied to the identification of 10 reference strains and 90 cultures of agents of invasive mycoses. In addition, the new approach was applied to detect fungal agents in 120 biological samples (blood, cerebrospinal fluid and bone marrow). PCR-RFLP results were compared with the ones obtained with conventional methods (culture, microscopy, and biochemical testing). Results The assays carried out with the reference strains (Candida albicans, Candida parapsilosis, Candida tropicalis, Candida krusei, Candida guilliermondii, Cryptococcus neoformans, Cryptococcus gattii and Histoplasma capsulatum), demonstrated that the RFLP profiles were correctly predicted by the in silico investigation and allowed unequivocal identification of all chosen reference strains. The PCR-RFLP also identified 90 cultures of agents of invasive mycoses correctly, 2.5 times faster than the conventional assays. Evaluating PCR-RFLP with biological samples it was observed that the PCR was found to be 100% accurate and the RFLP profiles allowed the identification of the etiological agents: C. neoformans (n = 3) and C. gattii (n = 1) in CSF samples, H. capsulatum (n = 1) in bone marrow and C. albicans (n = 2) in blood cultures. The detection and identification by PCR-RFLP were found to be between two to ten times faster than the conventional assays. Conclusion The results showed that PCR-RFLP is a valuable tool for the identification of invasive mycoses that can be implemented in hospital laboratories, allowing for a high number of clinical analyses per day.
Subject(s)
Fungi/isolation & purification , Mycoses/diagnosis , Polymorphism, Restriction Fragment Length , Brazil , Polymerase Chain Reaction , Invasive Fungal Infections/diagnosis , Fungi/genetics , Mycoses/pathologyABSTRACT
Chromoblastomycosis is a chronic subcutaneous mycotic infection caused by dematiaceous saprophytic moulds. The most frequently isolated agent is Fonsecae pedrosoi. This article reports a case of a man from the Amazon region in Northern Brazil who presented with a lesion of 12 months' duration, which gradually increased in size until covering the majority of his right leg. A successful treatment with itraconazole was performed.