All of these viruses can be infectious outside of the body for certain periods of time. However a good rule of thumb is that wet material is infectious and dried material is much less infectious.

所有这些病毒都可以在一定时间内在体外具有传染性， 简朴的判断方法是湿的物品感染性强，干的物品很少具有感染性。

youdao

All of these viruses can be infectious outside of the body for certain periods of time. However a good rule of thumb is that wet material is infectious and dried material is much less infectious.

所有这些病毒都可以在一定时间内在体外具有传染性， 简朴的判断方法是湿的物品感染性强，干的物品很少具有感染性。

youdao