double infect

例句：

1. 1.The patient was double infected with the virus and developed severe symptoms.
   这名患者同时被两种病毒感染，并出现了严重的症状。
2. 2. The outbreak of the disease double infected many people in the area.
   这种疾病的爆发使该地区许多人受到了双重感染。
3. 3.To prevent double infection, it is important to wash your hands frequently.
   为了防止双重感染，经常洗手是很重要的。