Because it's passed by-- can be passed by an oral route it's a disease that's very effectively transmitted in school settings where children are together, or childcare settings.

因为脊髓灰质炎病毒可以,经口传染途径进行传播,因此它是一种,极易在学校传播的疾病,在这些地方孩子们都聚集在一起

耶鲁公开课 - 生物医学工程探索课程节选

They take it, the vaccine itself, the virus, reproduces in their gut and they can actually spread it to other children in the same way that they spread the disease where you've got children that are maybe at school or at childcare.

他们服用了疫苗,则疫苗菌本体,病毒本体便在他们的体内进行繁殖,实际它们以同样方法传播到其他孩子体内,当你去学校或者幼儿园,接你的孩子的时候,这些病毒正在传播

耶鲁公开课 - 生物医学工程探索课程节选