nah. maybe if i were really high that would seem like a good theory, but I'm not so here's my take on it:
if you have a 24 hr flu, your body gets rid of it in 24 hrs but you feel like shit the whole time. If you have a 3 day flu you feel like shit the whole time but its slightly more bearable. When you have a long term sickness like pneumonia you are constantly sick but you learn to tolerate it to get through your day until you either a) get better or b) die.
so i think you can learn to tolerate a condition better the longer it is in your system because you know what to expect, but to suggest that the bug stays in you an dyou only get sick when it gets stronger is a ridicuous theory.