viral encephalitis

例句：

1. 1. He was diagnosed with viral encephalitis and had to be hospitalized for treatment.
   他被诊断出患有病毒性脑炎，必须住院治疗。
2. 2. The patient's condition worsened after being diagnosed with viral encephalitis.
   患者被诊断出患有病毒性脑炎后病情恶化。
3. 3. Viral encephalitis is a serious disease that can lead to severe neurological symptoms.
   病毒性脑炎是一种严重的疾病，可能导致严重的神经症状。