A Comparison of HIV-Infected Patients With and Without Opportunistic (AIDS-Related) Infection

Inclusion Criteria Patients may be eligible if they: * Are HIV positive (except Group 3b). * Are at least 13 years old (consent of parent or guardian required if under 18). * Patients may be eligible for Group 1a if they: * Have acute PCP. * Have never received potent anti-HIV drugs or have not received potent anti-HIV drugs for at least 8 weeks prior to getting PCP. * Have a CD4 cell count below 200 cells/mm3. * Patients may be eligible for Group 1b if they: * Have CMV disease. * Meet 1 of the following requirements: (1) have never received potent anti-HIV drug containing a protease inhibitor (PI) or a nonnucleoside reverse transcriptase inhibitor (NNRTI), (2) have not received potent anti-HIV drugs for at least 8 weeks before getting CMV disease, or (3) have been on stable anti-HIV therapy for at least 3 months with no new anti-HIV drugs started before CMV disease returned. * Have a CD4 cell count below 50 cells/mm3 if patient received anti-HIV drugs at any time in the past. * Have an eye exam (patients with CMV retinitis). * Patients may be eligible for Group 2a if they: * Have a history of PCP. * Are currently receiving potent anti-HIV drugs. * Have been enrolled in ACTG 888. * Have been off drugs to prevent PCP for at least 48 weeks prior to study entry. * Have not developed PCP while on potent anti-HIV drugs. * Have a CD4 cell count above 200 cells/mm3. * Patients may be eligible for Group 2b if they: * Have a history of CMV retinitis. * Are currently receiving potent…