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Congenitally athymic nude (nu/nu) and thymus-containing heterozygous (nu/X) mice were infected intraperitoneally with Cryptococcus neoformans over a wide range of challenge doses. Cryptococcal disease progressed more rapidly in nude mice than in their nu/X littermates. When nu/X mice were treated with amphotericin B, all survived an otherwise lethal dose of C. neoformans. At larger challenge doses, survival was prolonged in nu/nu mice treated with amphotericin B, but they later succumbed to cryptococcosis. At lower challenge doses, amphotericin B was curative in some nude mice. Therapy of nude mice with both amphotericin B and flucytosine further prolonged survival at high-dose challenge and increased the number of cures at low-dose challenge. These studies support an interaction of antifungal chemotherapy with thymus-dependent immune defense mechanisms. This interaction is most evident at high challenge doses, where antifungal chemotherapy cures nu/X mice but only modestly prolongs survival in nude mice.

Interaction of Chemotherapy and Immune Defenses in Experimental Murine Cryptococcosis