This can be purchased at a chemist or pet store as well as from your vet. Once infected a ferret can pass it on by other ferrets coming into contact with its bodily fluids even after a period of days. There is a test for this disease but no cure. Owners are strongly advised to have their animals tested especially if they are working ferrets. Aleutian disease is being spread largely by the wild mink.
Most affiliated clubs arrange low cost group testing sessions.
Don't get too close to your ferret if you have a cold, you don't want to make it suffer unnecessarily. You are visitor no.