The answer is viruses change their form when the immune system knows how to kill it and thats how they trick the immune system and viruses are much smaller than bacterias
I think the answer is drugs but i'm not so sure
Foods to avoid on a low residue diet are whole-grain bread, cereal, pasta &, etc. You should also avoid raw vegetables and dried fruit.
Okay, i'm going to need more information because you haven't really asked a question
