Abstract
The efficiency of two fungal conservation methods was compared: Suspension in sterile distilled water and subcultures on potato dextrose agar (PDA) slants at 4 °C. One hundred and eleven strains corresponding to 84 different-species of microorganisms studied in medical mycology were evaluated. The efficiency of each method was estimated by the survival percentage and the preservation of the morphological features of each strain within a seven-year period. From the 111 strains, 79 (71.2%) were preserved viable in water, compared to 86 (77.5%) strains preserved by subculture on PDA slants. Concerning morphological features 75 of the 79 water viable strains (94.9%) conserved their morphology. In contrast, only 60 of the 86 strains (69.8%) conserved their typical morphology by the PDA subculture method. The water conservation method offers important benefits over serial subculture such as: Minimal pleomorphism, simple, rapid and requiring few materials. Thus, the water conservation method is recommended for laboratories where specialized conservation equipment is not available.
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