Giant leech

The Giant Leech was a leech infected with the t-virus that took up residence within the waterways beneath the Raccoon General Hospital. Apparently different from the leeches James Marcus was working with, this leech was like its smaller kin, extremely sensitive to fire. If you move too far away from this creature, it will lose interest in you and go the other way. The Giant Leech also seemed to exert control over the Leech Zombie.