Yeasts of Medical Importance

Abstract
With the possible exception of Cryptococcus neoformans, the yeasts referred to in this paper are usually seen as saprophytes in man. Under certain conditions any one of them may become pathogenic and give rise to serious infections. Inasmuch as the factors that play a role in upsetting the balance between the host and these organisms are unknown, it behooves the physician and the microbiologist to use wisely what tools are available as an aid in interpreting the significance of these organisms when seen in pathologic materials. These tools include: (1) an awareness of the potentialities of these yeasts as pathogens; (2) biochemical methods for identification; (3) microscopic study of their morphology in clinical material; (4) repeated isolation of an organism from a lesion; and (5) a workable taxonomic system for proper classification.

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