Terry had to fight off sleep to keep studying. Tomorrow was the big test, and he still didn’t feel ready. He had another problem, though; his body had to fight off an infection. He was slowly getting sick, but he didn’t know it yet. It is difficult to fight against an attacker that you do not even know is there. Terry should have gone to sleep early to fight against this infection, but he did not feel sick yet. He just wanted to fight on in his studies so he could do well on the test. He did not know it, but he was ready for the test already. And even worse, just a few hours after the test, the infection would start a fever in his body. But he was young and strong and he could fight it too, after the test.