Various techniques may be used to identify organisms accurately. For example, diversity in the ubiquitous ribosomal RNA genes can be identified easily and adequately in medically relevant fungal species (de Hoog et al. 1997), even in instances where the precise etiological pathogens have not yet been described in great detail. Using rDNA-based molecular taxonomy, most species can be included in a general scheme on the basis of which important physiological parameters, such as biosafety levels, can be predicted (Bowman 1993; de Hoog 1996; de Hoog et al. 1998). However, in order to perform epidemiological studies into the dissemination of a fungal isolate, additional technologies and types of investigation are required. Especially in the current era of steadily increasing numbers of nosocomially infected patients, technologies allowing the precise identification of strains are essential.