Spitter

Summary
The Spitter is a female infected that can be identified with a pro-longed neck and the ability to spit stomach acid out of her mouth. She is one of the weakest special infected types, and once upon death will emit a puddle of acid that damages survivors very easily. She normally supports the groups of common infected.

Background Information
As the name suggests, these zombies spit highly dangerous acid that will melt flesh and bone. The mutation is that she has developed the ability to project an extremely corrosive ball of acid from her mouth in a mortar-like fashion. This projectile will collide with a ceiling or wall and drop down to the nearest solid walkable surface, and upon contact will spread into a large puddle of acid that increases in damage over time. It's possible, from the way the acid is spat, that the Spitter encases it in a thin sort of membrane or bolus (likely in her body or throat/mouth) which is either dissolved by the acid or breaks on impact.

Advantages

 * The Spitter can deal lots of damage with her spit that upon contact, can overwhelm a survivor's health.
 * They have the same damage as a common infected that can kill a player in two seconds if not careful.
 * She will emit a dangerous puddle of acid upon death.

Disadvantages

 * Other than her spit attack and similarities as a common infected, she is considered one of the weakest zombie types of the series.
 * She is very rare despite not being powerful.
 * Easily can be killed since the spit has a long cool down compared to the Tank rock throw.
 * Slightly slower than a survivor by one tick.

Trivia

 * Second female infected to encounter, after the Witch.
 * Appears in the first and third game only.
 * Unlike other zombies, the Spitter keeps her appearance and abilities from the first game, so a tab for the third game isn't necessary anyways.