- Any active opportunistic or other infection requiring chronic therapy at the time of study entry. Patients with PCP may be randomized to study medication following a minimum 7-day course of therapy resulting in stabilization of their disease. Patients with stabilized disease must have a fever < 39 C for at least 48 hours, pO2 (on room air ) = or > 60 mm, and an Arterial/alveolar gradient = or < 30 mm.