Infested marine

The infested marine is an infested terran armed with a gauss rifle.

StarCraft: Ghost
In StarCraft: Ghost, infested marines are available as player units. They still regenerate health and can still explode, but their main weapons are claws and an "infested" gauss rifle which fires poisonous rounds of ammunition which deal damage over time.

The infested marine costs two points in the Invasion game mode. 

StarCraft II
Infested marines appear as a reward portrait in StarCraft II.

Development
Infested marines were produced from infested terran buildings in alpha versions of StarCraft II.