If you are interested in more information about epidemiology, the CDC has an excellent free textbook online. It can be downloaded from the CDC. Chapter 1 is a good introduction to epidemiology. You can skip Chapter 2, you should already know what a histogram is from Math classes. Chapter 3 it is the most important and it review how to calculate risk, morbidity and mortality. Each year the regional and state competitionhere have several questions on these topics . You do not need Chapter 4. Chapter 5 and 6 have more detail that you need but give you a good idea about surveillance and how to investigate an outbreak. The glossary at the end of the book it is very useful to learn the terminology we will be using.