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Molecular typing of Candida isolates from patients hospitalized in an intensive care unit
1Laboratoire de Microbiologie, Hôpital Raymond Poincaré, 92380 Garches, France.
Objectives:
The aim of our study was the molecular typing of 40 clinical isolates of Candida spp. obtained from patients with burns or trauma hospitalized in the intensive care unit of a general hospital.
Methods:
Isolates were recovered from blood, deep trauma, urine, sputum or from environment within a short period of time (4 months). The yeasts were identified using commercial yeast identification kits as C. albicans (17 isolates), C. tropicalis (16 isolates) and C. parapsilosis (10 isolates). The epidemiological relation of the isolates was tested with the Random Amplified Polymorphic DNA assay using three or four arbitrary chosen primers.
Results:
All C. albicans isolates presented distinct RAPD profiles, C. tropicalis isolates presented both the same and distinct RAPD patterns and the C. parapsilosis isolates presented the same RAPD pattern. All the environmental isolates were identified as C. parapsilosis and they had the same RAPD pattern as C. parapsilosis clinical isolates. Candida parapsilosis delineation was confirmed with PFGE.
Conclusions:
The colonization/infection with C. albicans was endogenous, the C. tropicalis colonization/infection was both endogenous and exogenous, and the C. parapsilosis colonization/infection had an environmental origin.