Ferret Epizootic Catarrhal Enteritis (ECE): Green Slime Disease Explained

Epizootic catarrhal enteritis, usually shortened to ECE, is a contagious intestinal disease caused by ferret enteric coronavirus. Many pet parents know it as green slime disease because affected ferrets may pass bright green, watery, or mucus-heavy stool. The virus damages the tiny absorptive structures in the intestines, so the gut has a harder time digesting food and absorbing nutrients.

ECE tends to spread quickly when a new ferret joins a household, rescue, shelter, or breeding group. A younger ferret may carry the virus with mild or even no obvious signs, while an older ferret in the home becomes much sicker. That age pattern is one reason outbreaks can seem to appear "out of nowhere."

Some ferrets recover within a week or two, but recovery is not always fast. Older or already fragile ferrets may lose weight, stay weak, or have lingering digestive upset for much longer. Even when the illness starts with diarrhea, the bigger concern is often dehydration, poor calorie intake, and the stress the infection places on the whole body.

ECE is caused by ferret enteric coronavirus, a virus that spreads very easily between ferrets. Transmission usually happens through direct contact with an infected ferret, but it can also happen through contaminated bedding, litter pans, food bowls, carriers, clothing, or hands. In many homes, the trigger is the arrival of a new ferret that appears healthy but is carrying the virus.

After exposure, signs often begin within 2 to 14 days. The virus injures the intestinal lining, especially the villi, which are responsible for absorbing nutrients. That damage leads to maldigestion and malabsorption, which is why affected ferrets often have diarrhea, weight loss, and poor body condition.

Not every exposed ferret gets equally sick. Younger ferrets may have mild disease, while older ferrets often show more severe illness and may take much longer to recover. Stress, poor appetite, and concurrent illness can make the clinical picture worse, so your vet may also look for other digestive problems at the same time.

Your vet usually diagnoses ECE based on a combination of history, symptoms, physical exam findings, and rule-outs for other causes of diarrhea. A classic story is an older ferret developing green, mucoid diarrhea a few days after a new ferret enters the home. Because several ferret illnesses can cause diarrhea, diagnosis is often practical and clinical rather than based on one perfect in-clinic test.

Your vet may recommend fecal testing, bloodwork, and sometimes imaging to look for dehydration, low blood sugar, foreign material, ulcers, inflammatory disease, or bacterial overgrowth. In more complicated or prolonged cases, intestinal biopsy has historically been used to support the diagnosis, especially when the goal is to rule out other serious bowel disease.

The most important part of the visit is not the label alone. It is figuring out how sick your ferret is right now and whether outpatient care is reasonable or hospitalization is safer. That decision depends on hydration, appetite, body weight, stool severity, age, and whether there is vomiting or melena.

The most practical prevention step is quarantine. If you bring home a new ferret, keep that ferret separate from your current ferrets for about 30 days, and schedule a health visit with your vet before introductions. Use separate bowls, litter supplies, bedding, and play areas when possible. Wash your hands and change clothing after handling the new ferret if anyone in the home is medically fragile or if you are caring for multiple ferrets.

Because ECE can spread through contaminated objects, good hygiene matters. Clean cages, carriers, litter pans, food dishes, and shared surfaces regularly. If one ferret develops diarrhea, isolate that ferret promptly and contact your vet for guidance. Quick separation can reduce the size of an outbreak.

There is no routine vaccine for ECE. Prevention depends on careful introductions, sanitation, and early response to symptoms. If you adopt, foster, or board ferrets, ask about recent illness history before contact. That small step can make a big difference for older ferrets, which are often the ones hit hardest.