Dr. Fabian's presentation discussed recent studies on HIV and cognitive disorders. He explained that HIV is a retrovirus that causes AIDS by infecting immune cells and potentially causing cancer. It can be transmitted through bodily fluids. His research looked at how HIV infects brain cells and the gastrointestinal tract. He also discussed sphingolipids that enrich the central nervous system and their role in signal transduction. To study this, the presentation compared HIV infection in three types of monkeys injected with the virus to the effects in humans.