Chromoblastomycosis murine model and in vitro test to evaluate the sensitivity of Fonseca pedrosoi to ketoconazole, itraconazole and saperconazole

ABSTRACT

An experimental model of murine chromoblastomycosis and in vitro tests with Fonsecaea pedrosoi were used to test the sensitivity of this fungus to three different antimycotics. The experimental model was standardized in BALB/c mice inoculated intraperitoneally with a 10 6 CFU/ml suspension of a F.pedrosoi isolate. Clinical infection was evident after 5 days of inoculation. Three groups of 27 mice each were used in the experiment. One group was treated with ketoconazole (KTZ), another with itraconazole (ITZ) and the other with saperconazole (SPZ). Antimycotic therapy was continued for 21 days. The control group consisted of 40 mice which were inoculated, but not treated. Infection was documented by macroscopic and microscopic examination of affected tissue in addition to culture of tissue macerates. Minimal inhibitory concentrations (MIC) and minimal fungicidal concentrations (MFC) for the F.pedrosoi strain used were done. The in vitro results showed that SPZ was the most active with MIC 0.01 µg/ml and MFC 0.1 µg/ml, followed by ITZ, SPZ was also the most effective in vivo since 63 per cent of the trated animals (p=0.01) showed a curative effect after the observation period. We concluded that SPZ ha the best in vitro and in vivo activity against F. pedrosoi.