nephritis due to serum sickness

例句：

1. 1. He developed nephritis after being exposed to the virus.
   他暴露于病毒后发展为肾炎。
2. 2. The patient's condition worsened, and he was diagnosed with nephritis.
   患者的病情恶化，被诊断为肾炎。
3. 3. Nephritis is a serious disease that requires immediate medical attention.
   肾炎是一种严重的疾病，需要立即医疗关注。