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
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 3 is not coming out. There is only Left 4 Dead and Left 4 Dead 2. Both fun games.
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.
Not Left 4 Dead 1 or 2, but Valve and Havok announced the Haggard in Left 4 Dead 3.
You can't get The Passing on Left 4 Dead 1. It is only a DLC for Left 4 Dead 2.
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.