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 requiring both:
Scaria was added to balance out manhunter packs, from being a huge wealth boost from the corpse butchering. Now most of the manhunter animals end up as useless rotten corpses.
Financially, It is almost never worth it to cure the scaria, with the exception of Thrumbos or any other high value animals. In that case, if the manhunter Thrumbo is downed, curing the scaria then slaughtering it guarantees a useful corpse for butchering.