class 1-low level outbreak, usually in a third world country or first world rural area. the number of zombies in this class of outbreak ranges between one and twenty.
class2-urban or densely populated rural areas are included in this level of outbreak. total zombies will range between tweenty and one hundred.
class3-a true crisis. class 3 outbreaks, more than any other, demonstrate the clear threat posed by the living dead. zombies will number in the thousands, encompassing an area of several hundred miles.
class4-zombies take over.