Even worse, it can take quite some time for the disease to kill the ferret, allowing it to spread to other ferrets. These same types of crusts can form on the chin, or even on the pads of the feet, which crack and flake. Some ferrets will vomit or get the runs, others will have a cough or have difficulty of breathing. Some run high temperatures or have severe muscle twitching. It gets worse.
Many ferrets start to have seizures, quite debilitating.
The ferret will look disorientated, have a severe seizure, then remain dazed for periods of time afterwards. Often the ferret will scream in agony during the seizures. Usually, during one of these seizures, the ferret will die. The entire process can take weeks for the ferret to actually die from the disease, and they all do. Worse, the period of incubation varies, and can be as long as several weeks, so your ferrets can be infected and spread the virus to your clothing and other ferrets without your knowledge.