 - Currently being treated for OI including Pneumocystis carinii pneumonia PCP; cryptococcal meningitis; disseminated histoplasmosis; disseminated Mycobacterium avium complex MAC; cytomegalovirus CMV retinitis; CMV encephalitis; toxoplasmic encephalitis; other atypical non-tuberculous, non-MAC mycobacterial infections; or other serious, invasive BIs. Participants who have tuberculosis TB alone are ineligible for this study. Participants with bacterial pneumonia or serious BI must have a CD4 count less than 200 cellsmm3 within 30 days prior to study entry. Participants with other serious OIs, including other AIDS-defining and -related OIs for which appropriate therapy other than ART exists are eligible, pending investigator approval. Participants current OI treatment must have been started within 14 days prior to study entry, but may have been discontinued prior to study entry. 