Do you ever wonder why you get sick and others remain healthy? Do you remember sitting in class trying to stay awake after taking DayQuil, feeling achy, head pounding and nose all stuffed up, while other students around you are wide awake and feeling great? While you are sitting there feeling miserable, you may have asked yourself these questions-just how and why are you the lucky one to get sick? This web quest will lead you on a journey through the bacterial and viral world of infectious diseases and help you to answer those nagging questions. You will also discover just how essential bacteria and viruses are for human life, and what happens when they run amok in the human body.