在这个医学时代人们教育我们疾病是具有感染性和传染性的。
We have been educated in a medical age to think that most diseases are infectious or contagious.
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。
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.
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