“…Therefore, caution should be taken in extrapolating data from fetal cells to events which take place in adult microglial cells infected by immunodeficiency virus. Nevertheless, occasional reports on the interaction of lentiviruses with microglia from nonfetal tissue show that microglial cells, although principally supporting viral replication, usually do not do so ex vivo when isolated from neurologically asymptomatic infected hosts (6,7,11,17).…”