Epizootic Catarrhal Enteritis (ECE) — nicknamed "green slime disease" — is a highly contagious ferret coronavirus that causes profuse, bright green mucoid diarrhea and rapid weight loss. New ferrets introduced to a household almost always bring ECE to older ferrets, who develop the most severe disease. Most ferrets survive with aggressive supportive care, but death is possible in elderly or debilitated animals.
Last reviewed: June 2026
What Is Ferret ECE?
Epizootic Catarrhal Enteritis (ECE) is caused by a ferret-specific coronavirus (Ferret Systemic Coronavirus is a separate, distinct, and more serious disease — ECE is the intestinal form). ECE spreads via fecal-oral contact and infected secretions; it is one of the most contagious ferret diseases and spreads rapidly through multi-ferret households. The virus infects intestinal villi in the small intestine, causing severe malabsorption and profuse green mucoid diarrhea. As described in Quesenberry & Carpenter's Ferrets, Rabbits and Rodents, older ferrets and ferrets with concurrent illness (adrenal disease, insulinoma) are at highest risk of life-threatening disease, while young ferrets typically develop milder symptoms and recover faster. The AEMV Pet Care Guides, 2024 recommend strict quarantine of any new ferret for 2–4 weeks before introduction to resident ferrets, since ECE is a primary reason new-ferret introduction causes illness outbreaks.
Signs of ECE in Ferrets
The classic presentation is a newly introduced ferret that seems fine while a household's established older ferrets rapidly develop severe illness 1–3 days later.
Signs in affected ferrets:
- Profuse bright green or yellow-green mucoid diarrhea — the hallmark sign; may be birdseed-like or watery
- Severe weight loss — rapid loss of 10–20% body weight in days is possible
- Lethargy and reluctance to move
- Reduced or absent appetite — the anorexia exacerbates the rapid weight loss
- Vomiting in some ferrets
- Dehydration — sunken eyes, dry mouth, poor skin tent
- Teeth grinding (bruxism) — sign of nausea and abdominal discomfort
ECE can persist as chronic intermittent diarrhea for weeks to months after the acute phase in some ferrets, as described in Quesenberry & Carpenter. These chronic cases may cycle between periods of normal stool and green diarrhea for 6–12 months.
Diagnosis and Treatment
Diagnosis is typically clinical, based on the characteristic green diarrhea presentation in a ferret with known exposure history. PCR testing for coronavirus can confirm the diagnosis but is not always immediately available. Blood work assesses hydration, protein levels (hypoalbuminemia from malabsorption is common), and liver function.
Supportive care is the cornerstone of treatment: IV or subcutaneous fluids to correct dehydration, anti-nausea medication (maropitant, sucralfate for GI protection), nutritional support via assisted feeding (Hill's A/D or similar high-calorie recovery food), and probiotic supplementation to restore gut flora. Amoxicillin-clavulanate or other antibiotics may be used to prevent secondary bacterial infection in the severely compromised intestine. Immunocompromised ferrets may benefit from short-course prednisolone to reduce intestinal inflammation during the acute phase.
When to See a Vet
Call your vet today if:
- Any ferret in your household develops bright green or mucoid diarrhea
- A ferret has been visibly losing weight over 3–5 days
- Any ferret is lethargic after introduction of a new ferret
Go to the ER immediately if:
- Your ferret is completely unresponsive or cannot stand
- Diarrhea is profuse and continuous with rapid deterioration
- Dehydration signs are severe: sunken eyes, tacky gums, no urination
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Frequently Asked Questions
How did my ferret get ECE if they never leave the house?
ECE is most commonly introduced by a newly acquired ferret. The carrier ferret (often young and asymptomatic or mildly affected) sheds virus that infects older, more susceptible residents. The new ferret may appear completely healthy while triggering severe illness in established ferrets within 48–72 hours of introduction.
How much does treating ferret ECE cost?
A ferret vet visit costs $100–200. Blood work and fluid therapy run $200–400. Hospitalization for severely ill ferrets costs $300–600/day. Most ferrets require 2–5 days of intensive care during the acute phase; total treatment costs typically range from $500–1,500. Chronic ECE cases require ongoing management costs over several months.
Can ECE kill my ferret?
Young, otherwise healthy ferrets usually survive ECE with proper supportive care, though they may be very ill for 1–2 weeks. Elderly ferrets or those with concurrent diseases (adrenal disease, insulinoma) are at significantly higher mortality risk. ECE can be fatal in debilitated animals without prompt, aggressive treatment.
Can I catch ECE from my ferret?
No — ferret coronavirus causing ECE does not infect humans, dogs, or cats. The virus is ferret-specific. Good general hygiene (hand-washing between handling ferrets) is appropriate but the zoonosis risk is nil.
How long is a ferret with ECE contagious?
Ferrets actively shed virus during the acute phase of illness. Most stop shedding within 4–6 weeks of recovery, though some become chronic intermittent shedders. Quarantine new ferrets for a minimum of 2–4 weeks before introduction to prevent introducing ECE into a household with older ferrets.
Still Not Sure if Your Ferret Needs a Vet?
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