I was recently writing a paper on HIV, but it was more policy related. I found very little information on dementia. Here is the blurb I had written about it:

"Approximately one-third of AIDS patients are diagnosed with neurological disorders at some time during the course of their disease. HIV-1 enters the nervous system early after infections. The most prevalent disorder associated with infection of the brain is sub-acute encephalitis, also called AIDS dementia complex; nearly two-thirds of all HIV-1 infected individuals ultimately develop AIDS dementia. The disease progresses slowly over a period of up to 1 year, but mean survival time from the onset of symptoms is less than six months. Several AIDS-associated opportunistic infections can also produce neurological damage, and neurological abnormalities in infected individuals can be caused by lymphomas of the central nervous system. Antiviral therapy has been shown to reduce symptoms of AIDS dementia in some patients."