LCLs derived from B95-8 virus have a larger fraction of lytically infected cells than LCLs derived from endogenous virus. LCLs derived from endogenous virus (A,B) and LCLs derived from B95-8 virus (C,D) from healthy EBV-seropositive subject 20 were fixed and permeabilized followed by incubation with reference EBV-seropositive serum (A,C) or reference EBV-seronegative serum (B,D) and FITC-conjugated antihuman IgG.