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The use of restriction endonuclease analysis and Southern hybridization with our new CkF1,2 DNA probe, cold labeled with peroxidase, for the typing of Candida krusei isolates has been investigated. Fifty-five clinical samples isolated from forty-five patients hospitalized in eight centers, one environmental strain, and two reference strains were evaluated. Patterns were analyzed by a computer-assisted method and compared by numerical analysis. Clearer and less ambiguous patterns were obtained by restriction with endonuclease HinfI. It generated 9 to 14 (average, 11) well-separated fragments in the range of 6.5 to 2.0 kb. Both their numbers and sizes varied greatly among the strains studied. The CkF1,2 probe hybridized with one to seven fragments of HinfI patterns. A total of 48 distinct types were distinguished among the 58 strains studied. HinfI and CkF1,2 patterns showed similarities of less than 83 and 75% for unrelated strains and more than 91 and 100% for related strains, respectively. The methods showed 100% typeability, 98% reproducibility, and a discriminatory power of 1. C. krusei isolates from each patient were distinct, whether from one hospital or from different hospitals. Multiple isolates from the same patient were identical, both over time and at different anatomic sites. An endogenous origin is suggested for the colonizing and infecting isolates among the 45 patients. The CkF1,2 probe enhanced discrimination of the strains and provided a definitive comparison for strain identity. Genetic linkages between isolates were assessed at the subspecies level, and 12 clusters were delineated. A typing scheme is proposed for epidemiological studies of C. krusei.

Typing of Candida krusei clinical isolates by restriction endonuclease analysis and hybridization with CkF1,2 DNA probe