We had and idea of the whole world at risk of an infection and there being only one survivor from a various range of films such as.. I am legend, 28 days later, The crazies, Push and dawn of the dead . All these films have one thing in common which is the idea of 'the end of humanity' due to a disease or infection. Our idea was that a scientific biological experiment would mutate with only O + blood groups and cause people to turn into animals. The survivors who had different blood groups would have been eaten by the mad people and some running for there lives. Later on in the film we'd discover there were other survivors and they would try to conqure the disease.
By yaz