Uninfected cell included in syncytia. Free gp120 binds to cells. Antibody titer of p24 - High titer means the IS is working good, the latent period is present. When the p24 Ab titer goes down, the prognosis is not good. At this time the p24 antigen goes up.
Macrophages carry the virus to the brain.
Western Blot - Polyacrylamide gel electrophoresis of virus proteins.