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Viability, morphological characteristics and dimorphic ability of fungi preserved by different methods.

The viability, morphological characteristics and dimorphic ability of fungi were evaluated. Strain subcultures were maintained under mineral oil and in soil for different periods of time, ranging from 49 to eight years. Of the 16 Blastomyces dermatitidis strains, four maintained viability and were able to complete the dimorphic process to the M phase producing a large amount of conidia, but were unable to form Y cells at 36 degrees C. Of the 15 Histoplasma capsulatum var. capsulatum strains, only one was viable but it was impossible to check its identity because it lost sporulating and dimorphic ability. Of the 53 Sporothrix schenckii strains, 37 were viable, 28 able to sporulate and 12 of them completed the whole M <=> Y dimorphic process. All subcultures in soil became inviable. The results demonstrate that the preservation methods used here affected the morphology and sporulating and dimorphic ability of the strains. B. dermatitidis and S. schenckii were considered to be species that survive better than H. capsulatum var. capsulatum under mineral oil. Thus, it is necessary to establish routine monitoring and appropriate environmental and culture conditions, using less widely spaced transplants and choosing the exact time of intervention to induce growth and development restriction in each strain.