Invasion

"When you get sick, it starts out with a single bacterium, one lone nasty intruder. Pretty soon, the intruder duplicates, becomes two. Then those two become four. And those four become eight. Then before your body knows it, it's under attack. It's an invasion. The question for a doctor is once the invaders have landed, once they have taken over your body, how the hell do you get rid of them? What do you do when the infection hits you, when it takes over? Do you do what you're supposed to and take your medicine? Or do you learn to live with the thing and hope someday it goes away? Or do you just give up entirely and let it kill you?"