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Current therapy for leishmaniasis is unsatisfactory. Efficacious and safe oral therapy would be ideal. We examined the efficacy of SCH 56592, an investigational triazole antifungal agent, against cutaneous infection withLeishmania amazonensis and visceral infection withLeishmania donovani in BALB/c mice. Mice were infected in the ear pinna and tail withL. amazonensis promastigotes and were treated with oral SCH 56592 or intraperitoneal amphotericin B for 21 days. At doses of 60 and 30 mg/kg/day, SCH 56592 was highly efficacious in treating cutaneous disease, and at a dose of 60 mg/kg/day, it was superior to amphotericin B at a dose of 1 mg/kg/day. The means of tail lesion sizes were 0.32 ± 0.12, 0.11 ± 0.06, 0.17 ± 0.07, and 0.19 ± 0.08 mm for controls, SCH 56592 at 60 and 30 mg/kg/day, and amphotericin B recipients, respectively (P = 0.0003, 0.005, and 0.01, respectively). Parasite burden in draining lymph nodes confirmed these efficacy findings. In visceral leishmaniasis due toL. donovani infection, mice treated with SCH 56592 showed a 0.5- to 1-log-unit reduction in parasite burdens in the liver and the spleen compared to untreated mice. Amphotericin B at 1 mg/kg/day was superior to SCH 56592 in the treatment of visceral infection, with a 2-log-unit reduction in parasite burdens in both the liver and spleen. These studies indicate very good activity of SCH 56592 against cutaneous leishmaniasis due toL. amazonensis infection and, to a lesser degree, against visceral leishmaniasis due toL. donovani infection in susceptible BALB/c mice.

antimicrobial agents and chemotherapy

Efficacy of the Triazole SCH 56592 against <i>Leishmania amazonensis</i> and <i>Leishmania donovani</i> in Experimental Murine Cutaneous and Visceral Leishmaniases

Efficacy of the Triazole SCH 56592 against Leishmania amazonensis and Leishmania donovani in Experimental Murine Cutaneous and Visceral Leishmaniases