residual infection

例句：

1. 1. The patient's condition is still under investigation for a residual infection.
   患者的病情仍在调查中，以确定是否存在残余感染。
2. 2. Residual infections can cause long-term health problems.
   残余感染可能导致长期健康问题。
3. 3. The treatment plan includes a combination of antibiotics and antiviral drugs to eliminate residual infections.
   治疗计划包括抗生素和抗病毒药物的组合，以消除残余感染。