This Demonstration illustrates a very simple multiple epidemic model. At every iteration a random cell is chosen. The cell acquires the value (disease) of one of its four orthogonal neighbors unless it has previously assumed that value at a different time. Then, with a fixed probability, a random cell is chosen and it acquires a new value (disease) not yet found in the array. The model assumes that hosts can only be infected by one disease at a time, that being infected by another disease cures the original one, and that re-infection with the same disease multiple times is impossible.