"Special ability?" William asked.
Hans nodded. "As more and more virus multiplied inside our body, there'll be changes that occurred. There are several types of virus and the explanation is a bit long, so I'll shortened it to the general idea. In short, the reaction will not last forever and only to a certain number.
For some of us, we can see the changes even before the reaction is over. But for some others, you need to wait until the reaction is done before you can see what actually happened inside your body. When the reaction is over, the test result will show that there's no reaction of the virus in your body anymore but you have some kind of special ability."
