Aleutian Disease in Ferrets: Symptoms, Diagnosis, Treatment, and Prevention
Veterinary & Aquatic Services Department, Drs. Foster & Smith

What is Aleutian Disease?

Aleutian Disease Virus (ADV) is a parvovirus, but not the same strains as those that affect dogs, cats, or humans. One ferret-specific strain of ADV has been isolated and Aleutian Disease has also been reported in mink, skunks, and raccoons. Aleutian Disease Virus does not seem to affect any animals outside the Mustelidae family. Currently in the ferret population overall, the incidence of Aleutian Disease is low.

So named for first being isolated from the Aleutian strain of mink and initially reported in the 1940's, ADV was not reported in ferrets until the late 1960's. A hardy virus, it can survive in unfavorable conditions for months.

How is ADV transmitted?

ADV is highly contagious, although, infected animals may act as carriers without displaying outward symptoms of the disease. The virus can become airborne, although, it is more commonly spread via contact with the saliva, blood, feces, or urine of infected animals. It can also be spread via contact with contaminated surfaces or objects. If people get ADV on their hands or clothes, they can also transmit ADV from one ferret to another. How frequently an infected ferret sheds the virus is unknown at this time. Until further research proves otherwise, it is prudent to assume the virus can be shed at any time.

ADV is currently not considered to be a threat to the overall ferret population. Although isolated outbreaks have occurred in Texas, Michigan, Alabama, and the East Coast, the overall reports of the disease in clinical practice are very low.

What are the signs of Aleutian Disease?

Manifesting as a chronic wasting disease, infection with ADV can have limited effects or can be quite pervasive, involving nearly all organ systems. Any combination of the following may be seen: chronic weight loss; lethargy; cough; hindlimb paralysis or weakness; head tremors; enlarged kidney, liver and/or spleen; and blood abnormalities (dyscrasias). An infected ferret can also be totally asymptomatic for up to 2 years.

How is Aleutian Disease diagnosed?

Currently, diagnosis is based on clinical signs and symptoms, history, and serum antibody tests, such as an ELISA test. Antibodies to ADV are present in the blood 14 days after initial infection. Post mortem histological (looking at tissue under the microscope) findings are the most definitive method of diagnosis. Some ferrets may have positive antibody tests but show no signs of disease.

How is Aleutian Diseaes treated? Is there a cure?

Because so many organ systems may be involved, the treatment for Aleutian Disease is non-specific, supportive, and depends on how debilitated the ferret has become. This may include administering fluid therapy, tube or syringe feeding, and administering anti-inflammatory drugs. If the ferret is eating on its own, a good nutritional diet recommended for ferrets is very important. (This is, of course, important at all times but especially in the case of illness.) There is currently no "cure" for Aleutian Disease.

There is currently not a vaccine for Aleutian Disease, and in fact, an effective vaccine may be difficult to develop. When infected with ADV, the body produces huge quantities of antibodies, which is exactly what a vaccine would stimulate the body to do. Unfortunately, the antibodies which are produced do not kill the virus.

How can Aleutian Disease be prevented?

Prevention is best accomplished by controlling the spread of ADV. This is particularly important in a breeding facility or shelter where other ferrets may be housed. Any suspect ferret, or those having been identified as serum positive, should be isolated from other ferrets. All items that may have come into contact with the infected ferret should be scrupulously cleaned with a 10% bleach solution.

An infected ferret may be an asymptomatic, but should still be isolated from uninfected ferrets. If you have only one ferret and he has tested positive, there is no reason you should not keep the ferret, as long as your ferret has a healthy and happy quality of life. This is not a disease that can be transmitted to your other pets (unless they are in the Mustelidae family). It is also not a disease that can be transmitted to you.

 
References and Further Reading
Hillyer, EV; Quesenberry, KE. Ferrets, Rabbits and Rodents: Clinical Medicine and Surgery. W.B. Saunders Co., Philadelphia PA; 2004.
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