HD :: The supersoldier: chapter 4, page 16

A success for researchers. A simple injection and the subject had its strength and resistance increased. Time saved compared to metahumans. Small inconvenience, the rage shown by the victims. The fact that their blood transmits a virus transforming infected subjects. Hence the name Z virus. Theoretically the subjects were still alive and therefore neutralizable, but their organs ceased to function, which did not stop them. That and their taste for human flesh and blood. A necromorph took ten to twenty years to rot before dying. Their intelligence ranged from normal to atavitic. 8 years ago there was an accident, nerve gas canisters transmitting the Z virus were spread over the city of Empire and transported by the clouds. If elsewhere the neutralization of the necromorphs took place well on condition of not being bitten by a healthy carrier rat. Fifteen thousand Empire citizens were infected. A great wall was built around it and Empire was buried by the media when Techtron bought most of the media and founded the CSU media chain.