I wanted to point out that it is too obvious to the player when you are infected from a zombie scratch or bite. When you are not infected from a scratch, you notice right away because: 1. You are not gradually losing health 2. Your character does not become anxious My suggestion is that a scratch or bite should be less immediately obvious and should be more of a mysterious outcome until one is sure that they are not infected. Whenever one gets scratched or bitten, they should become anxious regardless if they are infected or not.