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Candida species have recently emerged as important nosocomial pathogens. Because of the lack of a reliable system for detecting differences within the same species, little is known about the epidemiology of infection with Candida species. We describe a typing system for Torulopsis glabrata and the non-C. albicans Candida species that uses contour-clamped homogeneous electric field electrophoresis (CHEF), a version of pulsed-field gradient gel electrophoresis, and compared it with restriction enzyme analysis (REA) of genomic DNA. One hundred seventeen clinical isolates from 40 patients were evaluated. CHEF and REA were performed on each of the isolates, and the results of the two procedures were compared. The REA procedure revealed 8 different types of Candida lusitaniae, 20 of Torulopsis glabrata, 5 of Candida tropicalis, 3 of Candida parapsilosis, and 7 of Candida kefyr, whereas the CHEF method revealed 14 different types of C. lusitaniae, 16 of T. glabrata, 10 of C. tropicalis, 10 of C. parapsilosis, and 7 of C. kefyr. The CHEF technique yielded unique patterns of electrophoretic karyotypes that could be used to distinguish intraspecies variations. When compared with REA, CHEF demonstrated greater sensitivity in recognizing subtle strain-to-strain variations in most isolates and will be a useful epidemiologic tool for studying non-C. albicans Candida species and T. glabrata.

journal of clinical microbiology

Comparison of restriction enzyme analysis versus pulsed-field gradient gel electrophoresis as a typing system for Torulopsis glabrata and Candida species other than C. albicans