I'm not a biology student at all, but I'm trying to get a clearer picture on what is meant by "virus cannot survive after a certain period".
To my understanding, a virus cannot be killed it can only be inactivated (for example, by means of heat and lowered pH).
So I really don't understand how can virus get inactivated by just being on a certain surface for an extended period.
I've come across numerous articles which told me virus won't survive on a surface. They usually focus on comparing the survival time between different types of surfaces but never touch on how the virus gets inactivated.
Can someone help me understand the "how"?