Your immune system can't always reach pathogens hiding inside your cells, so it destroys the infected cells instead. The video explains how viruses, mycotoxins, and parasites stay hidden and what your body does about it.
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Most of the time, the immune system is called to the site for a reason. It's just trying to figure out what's going on. I always use this analogy. You have a mold spore, a mycotoxin, a virus, in some cases parasites, and you have a healthy cell. They don't hide like this. They hide like this virus here. It's going to attach to the cell, it's going to inject its DNA and it's going to go in here, so they encapsulate it. So now what? If the immune system wants to get to this, it's going to go after this nucleocapsid protein. It's going to manufacturing an antibody to this cell, not in an effort to kill cell, but in an effort to get to the invader. If the police were chasing a perpetrator and he came in this room and locked the door, they would kick that door in, not because they're trying to bust down the door, but because they're trying to get to the perpetrator. The immune system is the same way. It will very often chase invaders into healthy cells. Once it goes into the healthy cell, how does it get through the door of the healthy cell?