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Two 18S rRNA-targeted oligonucleotide probes specific for Candida albicans and Candida parapsilosis were used to detect and identify by fluorescent in situ hybridization these medically important Candida species in deep organs of mice after experimental systemic infection. The C. albicans-specific probe detected fungal cells in kidney, spleen, and brain sections of a mouse infected with C. albicans but not in a mouse infected with the closely related species C. parapsilosis. Conversely, the C. parapsilosis-specific probe detected fungal cells in the deep organs of a mouse infected with C. parapsilosis but not in the deep organs of a C. albicans-infected mouse. In addition, the C. albicans-specific probe was used to detect this species in human blood spiked with yeast cells by a lysis-filtration assay and subsequent fluorescent in situ hybridization. By this assay, as few as three yeast cells per 0.5 ml of blood were consistently detected. Our results demonstrate that fluorescent in situ hybridization with species-specific rRNA-targeted oligonucleotide probes provides a novel, culture-independent method for the sensitive detection and identification of Candida species in clinically relevant material.

Detection and identification of Candida species in experimentally infected tissue and human blood by rRNA-specific fluorescent in situ hybridization