- (a) patients with a prior episode of cytologically confirmed PCP; (b) patients with a prior episode of any other AIDS defining opportunistic infection and < 200 T4 cells; (c) patients with advanced AIDS related complex (ARC) as defined by the clinical diagnosis of mucocutaneous candidiasis and/or unexplained weight loss (= or > 15 lbs or > 10 percent of total body weight within the previous 3 months) and < 200 T4 cells and one or more of the following symptoms: