Further symptoms include seizures or convulsions, tremors, hallucinations, stroke, and memory problems. Adult patients with encephalitis present with acute onset of fever, headache, confusion, and sometimes seizures. Younger children or infants may present irritability, poor appetite and fever. Neurological examinations usually reveal a drowsy or confused patient. Stiff neck, due to the irritation of the meninges covering the brain, indicates that the patient has either meningitis or meningo encephalitis. The signs and symptoms of tick born encephalitis are: The virus can infect the brain (encephalitis), the meninges (meningitis) or both (meningoencephalitis). In general, mortality is 1% to 2%, with deaths occurring 5 to 7 days after the onset of neurologic signs. In dogs, the disease also manifests as a neurological disorder with signs varying from tremors to seizures and death.