1st of all it's left 4!!!!! Dead and you have to play versus mode in the first. in l4d2, it is versus and scavenge.
You can't become a zombie, but you can play on versus and become a special infected.
in the first left 4 dead the infected where the spitter, smoker, hunter, tank, witch, hord
you get bitten
there is no fast zombie in left 4 dead...there is however a fast special infected. The hunter is without a dout the fastest special infected in left 4 dead.
No, you can only play as infected in multiplayer.
No
TANK
In Left 4 Dead, the goal of the zombies is to infect the survivors.
There is a very high risk that the dead fetal tissue will become infected.
cancer
The Special Infected were the Boomer, Smoker, Hunter, Tank, and the Witch. The Common Infected are everyone but the Four Survivors.
You can't, the survivors you play as are immune to the disease the infected carry. So it is impossible.