vehicle of infection

例句：

1. 1. The disease is spread by mosquitoes as a vehicle of infection.
   这种疾病通过蚊子作为传播媒介传播。
2. 2.The researcher found that the virus was transmitted through contaminated water as a vehicle of infection.
   研究人员发现，该病毒是通过受污染的水作为传播媒介传播的。
3. 3. The outbreak was traced back to a contaminated food product as a vehicle of infection.
   疫情被追溯到受污染的食品产品作为传播媒介。