ABSTRACT
Human immunodeficiency virus (HIV) is the causative agent of acquired immuno-
deficiency syndrome (AIDS) and is related to lentiviruses, a subfamily of retroviruses.
HIV infects T-lymphocytes (Dagleish et al., 1984), macrophages, dendritic cells and
microglia cells of the central nervous system (Price, 1988; He et al., 1997), rendering
patients severely immunodeficient and sensitive to opportunistic infections.
