WhiteKnight

WhiteKnight is the code name given to Dr. Pierre DuMont, a French scientist who invented a dangerous virus capable of turning humans into zombie-like creatures.

In-Game
WhiteKnight invented this potentially devastating disease some time prior to 1969. He attempted to sell it to U.S Military Generals by convincing them that the virus could make the enemy massacre each other, thus winning the war, but was turned down because they did not believe it was capable of all that he said (or else they feared the virus would cause an uncontrollable epidemic). Angered, WhiteKnight was flown to Cambodia while carrying the virus specimens, where an unknown accident of some kind (most likely a plane crash) left him stranded in the jungle, with the infection spreading to anyone who came into contact with it. The first victims of Whiteknight later eliminated Cal's Special Ops teammates and lead him into DuMont's hideout. DuMont captured him and injected him with the virus, making Cal a primary virus carrier.

The effects of the disease are capable of turning human beings into agressive and mindless infected. They will attack everyone they find in a fit of rage and tear them apart with their bare hands. They kill mindlessly and are incapable of coherent thought or speech. They are able to spread the infection to others by cutting or biting them. Notable victims of this include Sgt. Jack Griffin, who turned into an infected after being bitten by one in the level Trip. They pose minimal danger when faced individually. Their strength lies in sheer numbers and tenacity.

At the end of the game, if Nate chooses to take Dr. DuMont with him, it is revealed that he was able to deliver an antidote to the WhiteKnight disease, thus eradicating its presence on earth. The incident was most likely covered up by the U.S and Vietnamese governments, and Dr. DuMont taken to a secret location for sanctuary. If Nate allows Cal to kill WhiteKnight and takes his infected brother with him, the disease is spread across the continent, probably resulting in a world wide catastrophe.