Leech Zombie

The Leech Zombie is an irregular mutant that appears in Resident Evil Outbreak. It appears to be a human corpse that has been infested with infected leeches. The enormous swarm of mutant leeches overwhelm the body, feeding off whatever blood is left and anchoring themselves to the host's joints and nervous system, essentially turning the human cadaver into a vehicle.

History
The Leech Zombie appeared in the vicinity of Raccoon General Hospital during the Raccoon City Destruction Incident. It most likely needed to maintain proximity to the Giant Leech dwelling in the sewers beneath the hospital which functioned as a "queen" for the leeches' hive consciousness. This creature, like regular zombies, moved in a rigid fashion and wasn't especially fast, but seemed to possess a greater degree of intelligence and was capable of moving through confined spaces such as ventilation ducts.

A small band of survivors encountered the Leech Zombie at the hospital and fled from it, though a doctor who worked at the hospital fell prey to it. The leeches vacated their host and infested the doctor's body, making him their new host. The Leech Zombie followed the survivors around the hospital, using the air ducts to get from room to room. The survivors were able to lure the creature into a trap by baiting it with a blood pack, drawing it into a fixed-temperature laboratory and setting the temperature to high. The high temperature killed the entire leech swarm, leaving only a desiccated human corpse behind.