Scaria is a disease that causes afflicted animals to be permanently manhunter. If not treated, it kills affected animals in five days.
Upon death, animals with scaria have a chance of instantly rotting, preventing any butchering products from being obtained. This chance is dependent on difficulty.
In addition, as long as an animal is afflicted with scaria, they will remain manhunter, even after recovery from being downed.
It appears only on manhunter animals in quests or manhunter packs, and will not infect your tamed animals normally.
On a downed animal, it can be treated with an operation using 3 regular medicine or better, by a doctor with a medical skill of 8 or higher.
Added in 1.1.2647. Prior to 1.2, there was a bug where curing scaria would not remove manhunting.