Her mutations enables her to spit out a ball of mutated bile acid[1] 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 the acid has been down; this can be on average of up to 45-82 (based on difficulty) health with a single spit.

Overall, the Spitter's acid does the most total damage of any playable Infected, but is also the least reliable, as it only lasts for a short time.