Initially, the infected patients experience symptoms such as: severe headaches, delirium, lethargy, meningism, bradykinesia, and incoordination.
en.wikipedia.org Symptoms may soon expand to slight or partial paralysis, anxiety, insomnia, confusion, agitation, abnormal behavior, paranoia, terror, and hallucinations, progressing to delirium.
en.wikipedia.org It may also appear with delirium, but it is not required, as noted.
en.wikipedia.org Delirium as a syndrome is one which occurs more frequently in people in their later years.
en.wikipedia.org On the other hand, encephalopathy or delirium may develop relatively slowly and resemble dementia.
en.wikipedia.org