"It's Christmas time in New York City. A strange virus has appeared in the city, turning seemingly normal people into insane, violent folks called: Infected.
Rookie Officer Stevens is one of the first victims of the Infected. But unlike others, Stevens is stangely immune and doesn't lose control. The mysterious Dr. Schaeffer discovers that Stevens' immune blood can be used to destroy the otherwise unkillable Infected. Schaeffer creates a special "viral gun" that fills shells with blood from Stevens' arm and blasts them straight into the Infected, causing them to die.
Stevens is the only person who can save New York - and Christmas - from the Infected!"
Infected is a game of shifting power, chain reactions, huge explosions and double-fisted gunplay, in which players are put into the streets of New York City hunting flesh-hungry Infected with dual guns.
The game offers exciting and fast-paced multiplayer in Deathmatch and Team Deathmatch modes, in which players are able to spread their own unique avatar like a virus to other players' PSPs. If you'll get infected by others, the avatars will run around fighting in your single-player game. This new and innovative gameplay feature enables new exciting way of play including clans that spread the same virus.