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Specific oligonucleotide probes were developed to identify medically important fungi that display yeast-like morphology in vivo. Universal fungal primers ITS1 and ITS4, directed to the conserved regions of ribosomal DNA, were used to amplify DNA from Histoplasma capsulatum, Blastomyces dermatitidis, Coccidioides immitis, Paracoccidioides brasiliensis, Penicillium marneffei, Sporothrix schenckii, Cryptococcus neoformans, five Candida species, and Pneumocystis carinii. Specific oligonucleotide probes to identify these fungi, as well as a probe to detect all dimorphic, systemic pathogens, were developed. PCR amplicons were detected colorimetrically in an enzyme immunoassay format. The dimorphic probe hybridized with DNA from H. capsulatum, B. dermatitidis, C. immitis, P. brasiliensis, and P. marneffei but not with DNA from nondimorphic fungi. Specific probes for H. capsulatum, B. dermatitidis, C. immitis, P. brasiliensis, P. marneffei, S. schenckii, C. neoformans, and P. carinii hybridized with homologous but not heterologous DNA. Minor cross-reactivity was observed for the B. dermititidis probe used against C. immitis DNA and for the H. capsulatum probe used against Candida albicans DNA. However, the C. immitis probe did not cross-react with B. dermititidis DNA, nor did the dimorphic probe hybridize with C. albicans DNA. Therefore, these fungi could be differentiated by a process of elimination. In conclusion, probes developed to yeast-like pathogens were found to be highly specific and should prove to be useful in differentiating these organisms in the clinical setting.

Rapid Identification of Dimorphic and Yeast-Like Fungal Pathogens Using Specific DNA Probes