Science Fair Project Encyclopedia
Effects of Infestation
An Infested Terran usually loses most of it's intelligence and sanity, as it's mind becomes consumed by the Zerg. Most becomes faster and tougher, and develops the ability to burrow, as well as typical Zerg traits (the ability to quickly heal wounds and burrow, psionic sensitivity, and so forth). In addition, most Infested Terrans can explode, sacrificing themselves in a splash of toxic fluid. The explosion is incredibly powerful, capable of destroying small structures on it's own.
Purpose of Infestation
The Zerg believed they needed the use of psionic powers to defeat the Protoss. The Terrans were the only species they discovered with psionics powerful enough to help them achieve victory. However, most Terrans aren't psychic, and even those that are are not necessarily genetically compatible (meaning they would lose their intelligence and psionic powers).
Most Infested Terrans have no psionic powers, and are simply used as suicide soldiers.
A "mutate" is an Infested Terran whose intelligence has been preserved through the use of Terran-devised nanites. Such mutates have been observed in StarCraft: Deceptions and StarCraft: Alternity.
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