A 6-year-old child, three days after catching a cold, was informed that they are suspected of having encephalitis? What is encephalitis?

Patient's question:

3 days

Doctor's answer:

Fever, headache, body pain, nausea, vomiting, fatigue. A few may have bleeding rashes and myocarditis. The fever duration is about 7 to 10 days. Consciousness disturbance, meningeal irritation. On the second day of illness, neck muscle and scapular muscle flaccid paralysis may appear, leading to drooping head and inability to raise arms, feeling helpless. Involvement of cranial nerves and lower limbs is rare.