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[Identification of Candida albicans by specific primers of polymerase chain reaction and DNA probes].

Candida albicans is a pathogenic yeast. Two sets of universal primers were used for specific identification of Candida albicans with PCR-amplified ribosomal DNA internal transcribed spacers (ITS). Among the species of Candida, the amplified ITSI and ITSII of DNA fragments were similar in size. The PCR product was purified and labeled with digoxigenin and used as DNA probe in the detection with target DNA of Candida albicans by hybridization. Two sets of specific primers (CA1 and CA2 to amplify ITSI, CA3 and CA4 to amplify ITSII) were designed by alignment of ribosomal ITS sequence of pathogenic Candida albicans with other species to detect C. albicans by PCR. The sensitivity of PCR using the specific primers to detect pure culture of C. albicans was 0.1 ng (about 10(3)-10(4) cells). If the yeast cells were mixed with two other strains, there was a 10-fold decrease in sensitivity (1 ng or 10(4)-10(5) cells) under the same PCR conditions.