CYTOMEGALOVIRUS INFECTION: Primary prophylaxis is logical in high-risk subjects (CD4 < 50) who are asymptomatic; per os ganciclovir is under evaluation. Systematic secondary prophylaxis relies on intravenous ganciclovir or foscarnet. HERPES SIMPLEX AND ZOSTER: Secondary prevention with acyclovir is not recommended due to the risk of resistance. Herpes zoster retinitis is an absolute indication for continuous oral treatment with acyclovir. CRYPTOCOCCUS: Oral fluconazol is required for secondary prophylaxis. CANDIDIASIS: Due to the risk of resistant strains, neither primary nor secondary prophylasis is recommended. HISTIOPLASMOSIS: Risk of recurrence justifies secondary prophylaxis with itraconazole or fluconazole. COCCIDIODOMYCOSIS: Secondary prophylaxis with amphotericin B or fluconazole is mandatory. ASPERGILLOSIS: Itraconazole is the best agent when prophylaxis is needed.
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