"His infected chubby body can support a huge amount of damage before he dies."
An Infected Chubby is a fairly difficult infected. This infected has 500 hp which is about 11 times the amount of health as an average runner. It runs at the same speed as an infected Colonist. They can spawn from Doom Villages and from later waves. They usually spawn on the outer edges of the map and are a force to be reckoned with if you are not prepared.