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Saperconazole (R66905) is a broad-spectrum antifungal triazole and has potent activity against Aspergillus with an MIC90 of 0.19 mg/L.

The antifungal activity of Saperconazole is complete at 1 μg/mL for all but one strain of A. niger. Eighty percent of all strains show complete absence of growth at 0.1 μg/mL (85% for A. fumigatus), and this result persists during 14 days of the test[2].

All control pigeons infect with A. fumigatus die within 2 to 5 days. They have necrotic foci in the lungs, air sacs, liver, spleen, and kidneys. These organs are highly positive by histology and oncultures. Saperconazole administered at 2.5 mg/kg is not active, but when it is given at 5 or 10 mg/kg, 92 or 100%, respectively, survive and organ cultures are negative. No drug-related side effects are observed in the pigeons[2].

[1]. Otcenásek M, et al. Susceptibility of clinical isolates of fungi to saperconazole. Mycopathologia. 1992 Jun;118(3):179-83. [2]. VVan Cutsem J, et al. Oral and parenteral therapy with saperconazole (R 66905) of invasive aspergillosis in normal and immunocompromised animals. Antimicrob Agents Chemother. 1989 Dec;33(12):2063-8.

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