Five cases of irreversible mental disorders (dementia) are reported in pati
ents with immunodeficiency as the consequence of HIV-infection. Such cases
comprise 4,3% of the patients infected by HIV at the stage of AIDS. Among t
he patients with dementia a cytomegaloviral damage to the brain was diagnos
ed in 83,3% of the cases. Mean life span of the patients was 2 months from
the moment of the rise of psychopathologic symptomatology. An early diagnos
is of the disorders of mental activity in individuals infected by HIV is ne
cessary for establishing etiology of the pathologic process and for prescri
bing a specific medicine early.