A 43-year-old gentleman has been brought to the Emergency depa | Neurology collections 2020

A 43-year-old gentleman has been brought to the Emergency department by his partner.
He was diagnosed with HIV infection 10 years ago and his CD4 count has been maintained on triple therapy.
He has recently been dismissed from work for poor performance. He has lost interest in cooking and socialising
over the past 10 months. There has been a slurring in his speech. His partner feels he has been more
aggressive and withdrawn, however in the past few days he has started to have hallucinations.
What is the likely diagnosis?