Pennsylvania suffers an outbreak of "Green Flu"; a highly contagious virus causing extreme aggression, mutation to the body cells, and loss of higher brain functions. Two weeks after the infection four immune survivors— Bill, a Vietnam veteran; Zoey, a college student; Louis, an IT analyst, and Francis, an outlaw biker— make their way through the city of Fairfield, only to discover that the virus is creating more dangerous mutations. After narrowly avoiding these new infected, along with hordes of others, the survivors are alerted to the presence of an evacuation point at the nearby Mercy Hospital roof by a passing helicopter. Fighting their way through the city's streets, subway and sewers, they are rescued from the hospital's roof by the pilot, only to discover he is infected.... 

That is the story of the four who survived the infection, but what about the story of the special infected, before they were infected? What were their lives like and how did they get infected? The infection spreads slowly in the special infected, so how what was it like for them?
This is their story....
[img=http://fc04.deviantart.net/fs71/f/2011/330/f/b/left_4_dead___very_special_infected_2_by_ghostfire-d4hel3t.jpg]
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So anyone interested?