The Spitter

"That long necked bitch hit me!"

The Spitter is a Special Infected that made her debut in Left 4 Dead 2.

The Spitter's mutations enable her to spit out a ball of mutated stomach acid which, upon hitting the ground, spreads out into a large pool. Any Survivors standing within the pool of acid take increasing amounts of damage based on how long they stand in it; this can be up to about 3 quarters of their heath with just one puddle. Overall the Spitter's acid does the most damage of any infected, but is also the least reliable as it only lasts for a short time, and once it pools out it is stationary and relatively easy to escape.

When killed, the Spitter leaves a smaller pool of acid around her corpse. She can sometimes be a bit difficult to hear, making somewhat faint squealing noises as opposed to the more distinct noises other Special Infected make, but the hacking noises she makes when she actually spits are easy to hear.

Trivia

 * According to recent gameplay footage, as well as the second Left 4 Dead 2 trailer, the newest Spitter model is permanent. She was made larger, sports a thin, green bra and pink thong under her pants, and leaves a green slime trail from her mouth as she walks. Her legs no longer seem lengthened, but her neck is still extended. Her face is mostly deteriorated away, save for her teeth and most interior mouth tissue. When killed, she will rupture, causing the acidic goo to spill and pool where she was killed, along with her body.
 * The Spitter is currently the first female Special Infected to be playable, followed by the female Boomer
 * The Spitter's goo does not seem to harm other Infected, as they are most likely immune to its acidity. This could be very useful for Smokers, Hunters, or even Boomers, as there is nothing much more problematic for a Survivor than to be blinded, standing in acid, being attacked by a horde, and pounced by a Hunter or strangled by a Smoker at the same time. However, she does not seem to have complete immunity, as there are large, irritated burns where her acid seems to have dripped on. Her mouth and face are also extremely twisted and appear to have melted, most likely due to spitting so much acid.
 * The Spitter appears to have an extreme version of the disease known as acid reflux. This is another reference to Special Infected possibly gaining their powers through bodily properties they had before they turned.
 * It should be noted that in Mercy Hospital, one of X-rays shows an elongated neck. It is possible that this X-ray is a person that has been infected with the same strain of the virus as the Spitter.
 * In the achievement icon for Great Expectorations, the Spitter seems to look more like a hunched Witch than her current in-game model. When players unlock this achievement, the window says "Great Expectorations, while the Steam window will say "Spit happens."
 * The achievement Acid Reflex is also an achievement of the game Half-Life 2: Episode 2.
 * When playing as a Spitter, you will slow down for about 2 seconds after shooting goo.
 * The Spitter's attack music cue is called Enzymicide, possibly derived from Enzyme and homicide. This perhaps suggests that not only the gastric acid expelled from the Spitter hurts the Survivors but also the digestive enzymes such as proteases which are corrosive to the protein of human skin.
 * On the Spitter's left hand, one can see 4 wedding rings. This could imply the Spitter was in several relationships previous to the spread of the Infection.