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- Title
In vitro susceptibility of isolates of Sporothrix schenckii to amphotericin B, itraconazole, and terbinafine: comparison of yeast and mycelial forms.
- Authors
Kohler, Lidiane Meire; Soares, Betânia Maria; de Assis Santos, Daniel; Da Silva Barros, Maria Elisabete; Hamdan, Júnia Soares
- Abstract
Forty-three clinical isolates of Sporothrix schenckii derived from humans and animals were evaluated in vitro for their susceptibility to amphotericin B, itraconazole, and terbinafine. MICs were determined by the method of micro dilution in liquid media, using protocols M27-A2 for the yeast form and M38-A for the mycelial form, both standardized by the Clinical Laboratory Standards Institute. In general, higher MICs were found for the mycelial form (intervals of up to two dilutions). In the case of amphotericin B, a significant difference in activity was observed, with higher values (p < 0.05) found for the mycelial form. MICs for itraconazole and terbinafine were similar for both yeast and mycelial forms but slightly higher for mycelia. Although data presented here indicate different levels of susceptibility when both growth forms were compared, indicating an intrinsic difference between them, it is still difficult to draw a consensus as to which form correlates better with clinical findings. More studies are necessary to determine the criteria for in vitro tests that will lead to efficient therapeutic choices.
- Subjects
MICROBIAL sensitivity tests; SPOROTRICHUM; AMPHOTERICIN B; TERBINAFINE; ANTIFUNGAL agents; IONOPHORES; POLYENE antibiotics; YEAST
- Publication
Canadian Journal of Microbiology, 2006, Vol 52, Issue 9, p843
- ISSN
0008-4166
- Publication type
Article
- DOI
10.1139/W06-040