Original design: Patients included are those already enrolled in ACTG 081. Patients are enrolled from all centers at either week 8, 12, 16, 20, 24, 28, or 32 of participation in the parent study. They are randomized to receive either oral fluconazole or clotrimazole troches. Prophylaxis continues until a serious fungal infection develops, the end of the parent study is reached (which is expected to be December 1991), the patient withdraws from either the nested or parent study, or the patient dies. Clinical examination is performed at 2 weeks and then monthly (or more if clinically indicated) for the duration of antifungal prophylaxis; the schedule of evaluation is the same as for the parent study. There is a 1-month postprophylaxis follow-up after discontinuation of prophylaxis for any reason.