Small sam is in the same situation that everyone that was under 16 (not infected by the disease) He needs to survive in a environment with deceased people try to eat the people under 16. if a adult or infected bites an infected person and the bitten person get away they do not become infected. humanity had no idea about the disease until it started to show symptoms. 16 years ago when the disease did not show symptoms, people born after that were immune to the disease that everyone else had, but it did not show symptoms. About 13 or 14 years later the disease mutated, showing symptoms. The disease started to make people that are not immune grow boils everywhere,get a very bad fever, and gets a headache that tells them to eat uninfected. Small sam in not infected and needs to find a way out with the others. this takes place in present time.