Necroa Virus DLC. It causes muscle growth in the sub-mandibular duct. This allows some zombies to use acid spit as a projectile, and as a result, those select few zombies have a combat advantage. This increases their severity. Evolving this alongside the symptom Enhanced Sensory Integration unlocks the Spitter achievement and symptom combo.
- It is based on the spitting cobra, like how spitting cobras spit their venom, zombie spit acid. Naja is the genus of cobras.
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