[Parasitic adaptation phenomena of pathogenic fungi in human and veterinary medicine].

The pathogen species involved in medical and veterinary mycology can be divided into three categories according to their level of increasing adaptation to parasitism. Only the third category includes a few species (some dermatophytes) which can be regarded as genuine parasites. The opportunistic fungi belong to the first or the first two the third categories according to the given definition. The various possible factors of preadaptation or adaptation to parasitic life (physical factors, biochemical factors, avoidance of the immunological pressure and ecological factors) are discussed. Except for the species belonging to the first category the probably are efficient only if the host does not react normally.