Devil's infected with the disease develop large tumours on their face
Very low genetic diversity makes them all very similar. due to this the entire population is equally vulnerable to the disease making them endangered.
They bite, claw and scream at each other while fighting over food
As they bite each other on the face the disease is passed on to another
Due to this low genetic diversity this disease is very common among children since they aren't resistant to the disease meaning they cant give birth to resistant babies.