The virus on left 4 dead is called the Green Flu
Left 4 Dead begins in Pennsylvania, following an outbreak of so-called "Green Flu" (not actually a flu, but a form of rabies), a highly contagious virus causing extreme aggression and loss of higher brain functions. It was spread through biting.
No there isn't
No, Left 4 Dead 3 is not coming out. There is only Left 4 Dead and Left 4 Dead 2. Both fun games.
People were getting sick with this so called "Green Flu"(In the game). That's when zombies came to Left 4 Dead.
No, left 4 dead will only work for left 4 dead mods.
left for dead
They (Valve and Havok) haven't announced a left 4 Dead 4, but they have announced a Left 4 Dead 3 coming out in 2011.
You can't get The Passing on Left 4 Dead 1. It is only a DLC for Left 4 Dead 2.
Not Left 4 Dead 1 or 2, but Valve and Havok announced the Haggard in Left 4 Dead 3.
Left 4 Dead is quite a good game if you like shooting zombies in an online mmo style. But, if you already have left 4 dead, you should get left 4 dead 2.
If you love zombie games then you'll love Left 4 dead, they also came out with Left 4 Dead 2.
Steam's Left 4 Dead and Left 4 Dead 2 engines have eliminated bunny hopping.