The authors submit information on a new categorization of microscopic fungi causing human mycoses, as well as criteria of their classification in bio-risk groups (BioSafety Level – BSL) proposed by the European Confederation of Medical Mycology. According to the risk of infection of laboratory workers during handling of cultures isolated from biological specimens almost 400 species of fungi were divided into three groups (BSL 1 and BSL 2 – fungi which can produce systemic infections in subjects with immunodeficiencies, or superficial infections in healthy subjects, BSL 3 – fungi which can produce severe systemic infections also in healthy subjects). At the same time they express reservations to the classification of some species into groups.

        Key words: human pathogenic fungi – classification – bio-risk groups.