Longitudinal analysis of EBV types in AIDS-NHL patients. Contribution of EBV type 1 (▪), EBV type 2 (▩), and dual infection (□) in the total percentage of EBV-positive AIDS-NHL patients in early and late PBMC samples in the course of HIV-1 infection. EBV type discrimination was performed by type-specific PCR analysis on PBMC as described in Materials and Methods.