Important Information

⚠️ Having feline coronavirus does NOT mean having FIP.
Only a small percentage (3–10%) of cats develop the mutation that causes FIP. The majority of cats with FCoV live normal, healthy lives.

If your cat has already been diagnosed with FIP, do not lose hope. Since 2019, treatments have been available with a cure rate of over 90%.

Find Out How FIP Is Treated Today →

The Essentials of Feline Coronavirus

  • What it is: A common virus in cats; most cats do not develop serious symptoms
  • Transmission: Via the faecal-oral route (shared litter trays, contaminated surfaces)
  • NOT FIP: Common coronavirus (FECV) is different; only internal mutations cause FIP
  • When to be concerned: Persistent fever, distended abdomen, weight loss, jaundice, lethargy
  • Hope: If FIP develops, effective treatments are available today

Table of Contents

1. What is Feline Coronavirus (FCoV)?

Definition and Characteristics

🦠 Feline Coronavirus (FCoV)

Feline coronavirus is a cat-specific virus that is not transmitted to humans or dogs. It is extremely common in feline populations, particularly in multi-cat households, shelters, and catteries.

Up to 80–90% of cats in multi-cat households have been exposed to the virus at some point in their lives.

Two Main Forms of the Virus

FECV – Feline Enteric Coronavirus

  • Benign and common form
  • Infects the gastrointestinal tract
  • Causes mild symptoms or none at all
  • May cause occasional diarrhoea
  • Most cats recover without any issues

FIPV – FIP-Associated Virus

  • Mutated and serious form
  • Result of FECV mutations
  • Occurs within the individual cat
  • Causes Feline Infectious Peritonitis
  • Affects only 3–10% of infected cats

✅ Reassuring Fact

The vast majority of cats with feline coronavirus (FECV) will never develop FIP. The common virus is generally harmless, and the cat's body can either eliminate it or coexist with it without any problems.

Global Prevalence

📊 Epidemiological Data

  • Single-cat households: 20–40% prevalence
  • Multi-cat households: 80–90% prevalence
  • Shelters and catteries: Up to 100% in some cases
  • Conversion to FIP: Only 3–10% of infected cats

2. How Does Feline Coronavirus Spread?

Main Route of Transmission: Faecal-Oral

🚽 Faecal-Oral Transmission

Feline coronavirus is transmitted primarily through contact with contaminated faeces. Infected cats shed the virus in their stools, and other cats become infected by:

  • Using the same litter tray
  • Walking on contaminated surfaces and then grooming themselves
  • Sharing food and water bowls near litter trays
  • Direct contact with carrier cats

Risk Factors for Transmission

⚠️ High-Risk Situations

  • Shared litter trays: Primary source of transmission
  • High cat density: More than 3–4 cats per household
  • Poor hygiene: Infrequent cleaning of litter trays
  • Confined spaces: Without isolation areas
  • Environmental stress: Frequent changes, fighting, noise
  • New arrivals: Without prior quarantine

What Does NOT Spread FIP

🔴 Crucial Clarification About FIP

FIP is NOT contagious between cats.

What spreads is the common coronavirus (FECV). FIP occurs when this virus mutates within the body of an individual cat. This mutation is an internal event, unique to each individual cat.

If a cat develops FIP, the other cats in the household will not "catch" FIP directly, although they may carry the common coronavirus and may have been exposed to the same risk factors that triggered the mutation.

3. Symptoms of Feline Coronavirus

Enteric Coronavirus (FECV) – Common Form

😺 FECV Symptoms (generally mild)

Most cats with enteric coronavirus are asymptomatic or present with very mild symptoms:

  • Mild and transient diarrhoea (1–3 days)
  • Softer stools than usual
  • Temporary loss of appetite
  • Mild lethargy
  • Spontaneous recovery in most cases

Many cats never show symptoms and remain active and healthy despite carrying the virus.

Asymptomatic Carriers

💚 Healthy Carriers

Many cats are chronic carriers of feline coronavirus without developing any illness. These cats:

  • Live completely normal lives
  • Do not require treatment
  • May naturally eliminate the virus over time
  • Need a stress-free environment to prevent mutations

When Symptoms Require Veterinary Attention

🚨 Warning Signs – Seek Veterinary Advice

Seek immediate veterinary attention if your cat shows:

  • Persistent diarrhoea (more than 3–5 days)
  • Diarrhoea with blood or mucus
  • Loss of appetite (for several days)
  • Progressive weight loss
  • Dehydration (dry gums, loss of skin elasticity)
  • Severe lethargy or depression
  • Persistent fever

4. When Can Feline Coronavirus Lead to FIP?

The Mutation Process

🧬 Internal Viral Mutation

FIP occurs when feline coronavirus (FECV) mutates within the cat's body and acquires the ability to infect and replicate within immune system cells (macrophages).

This mutation is:

  • Individual and unique to each cat
  • Not transmissible to other cats
  • Unpredictable in its occurrence
  • Influenced by genetic and immunological factors (weakened immune system)

Factors That Favour Mutation to FIP

⚠️ Risk Factors for Developing FIP

  • Chronic stress: Change of home, fighting, moving house, surgery
  • Weakened immune system: Kittens under 2 years old or senior cats
  • Concurrent illnesses: FeLV (feline leukaemia), FIV (feline immunodeficiency)
  • Genetic predisposition: Breeds such as Abyssinian, Bengal, Birman, Ragdoll, British Shorthair
  • High viral load: Intense exposure in environments with many cats
  • Low immunity: Following vaccinations, surgery, or stress
  • Age: Kittens aged 4–12 months are most vulnerable

Real Probability of Developing FIP

📊 Reassuring Statistical Data

Of all cats infected with feline coronavirus:

  • 90–97% will never develop FIP
  • 3–10% develop the mutation that causes FIP
  • The majority either eliminate the virus or coexist with it without problems

Having feline coronavirus is NOT a death sentence for FIP.

Can the Mutation Be Prevented?

🛡️ Prevention Strategies

Although it cannot be prevented entirely, reducing stress and strengthening the immune system significantly lowers the risk:

  • Calm and stable environment
  • High-quality nutrition
  • Avoiding sudden changes
  • Regular veterinary check-ups
  • Appropriate management of concurrent illnesses
  • Reducing the number of cats in confined spaces

Is Your Cat Showing Possible Symptoms of FIP?

Learn about the specific signs of FIP and the treatment options available today.

View Complete FIP Guide →

5. Differences Between Feline Coronavirus and FIP

Full Comparison Table

Characteristic Feline Coronavirus (FECV) FIP (FIPV)
Prevalence Very common (80–90% in multi-cat households) Rare (3–10% of infected cats)
Transmission Yes, via the faecal-oral route Not contagious (internal mutation)
Symptoms Mild or none (occasional diarrhoea) Serious (fever, effusions, neurological signs)
Location of Virus Gastrointestinal tract Systemic (macrophages, organs)
Prognosis Excellent (spontaneous recovery) Serious without treatment; excellent with antivirals
Treatment Not required (supportive care if symptomatic) Antivirals (GS-441524/Remdesivir)
Duration Days to weeks (or chronic carrier) Progressive without treatment

Specific Signs of FIP vs Common Coronavirus

✅ Common Coronavirus (FECV)

  • Mild and transient diarrhoea
  • Cat active and playful
  • Normal or slightly reduced appetite
  • No fever or very mild fever
  • Recovery within a few days

⚠️ Possible FIP (veterinary assessment required)

  • Persistent fever that does not subside
  • Distended abdomen (ascites)
  • Possible breathing difficulties (pleural effusion)
  • Progressive weight loss
  • Jaundice (yellow mucous membranes)
  • Possible neurological or ocular signs

6. Diagnosis of Feline Coronavirus

Available Tests

🔬 Diagnostic Methods

Diagnosis of feline coronavirus can be made through:

  • Serology: Detects antibodies against FCoV in the blood
  • Faecal PCR: Detects viral genetic material in the stools
  • Clinical examination: Assessment of symptoms and risk factors

Interpreting Results

⚠️ Important: A Positive Test Does NOT Mean FIP

If your cat tests positive for feline coronavirus:

  • It only indicates exposure: The cat has come into contact with the virus
  • It does not confirm FIP: Most positive cats never develop FIP
  • No treatment required: If the cat is healthy and active
  • Follow-up recommended: Monitor clinical signs, not the test result

When Should Tests Be Done?

Most vets do not recommend testing asymptomatic cats for feline coronavirus, as a positive result does not change the cat's management.

🩺 Indications for Testing

  • Before introducing a cat into a cattery
  • Assessment of feline colonies
  • Investigation of diarrhoea outbreaks
  • NOT routinely in healthy cats

7. Treatment and Management

Common Feline Coronavirus (FECV)

✅ No Specific Treatment Required

Most cats with enteric coronavirus (FECV) do not require medication:

  • Spontaneous recovery: The immune system eliminates or controls the virus
  • Supportive care: Adequate hydration and nutrition if diarrhoea is present
  • Probiotics: May help stabilise the intestinal flora
  • Digestible diet: High-quality, easily digestible food

If the Cat Develops FIP

💊 Antiviral Treatment Available

If the coronavirus mutates and causes FIP, effective treatments are available:

  • GS-441524: Specific antiviral with cure rates of >90%
  • Remdesivir: Injectable alternative (converts to GS-441524)
  • Duration: 84-day protocols (standard) or 42 days (under investigation, with very limited studies and only in cats with wet FIP)
  • Veterinary supervision: Essential for dose adjustment and monitoring

More Information on FIP Treatment →

Post-Infection Follow-Up

📋 Long-Term Follow-Up

Following a feline coronavirus infection:

  • Maintain a stress-free environment
  • Regular veterinary check-ups (every 6–12 months)
  • Monitor for any signs of illness (fever, lethargy, weight loss)

8. Myths and Facts About Feline Coronavirus

❌ MYTH: If My Cat Has Feline Coronavirus, It Will Die of FIP

Only 3–10% of cats with FCoV develop FIP. The vast majority live normal, healthy lives.

✅ FACT: Having FCoV Is Very Common and Generally Harmless

Up to 90% of cats in multi-cat households have or have had FCoV without any problems.

❌ MYTH: Feline Coronavirus Can Be Passed to Humans

FCoV is cat-specific and poses no zoonotic risk.

✅ FACT: It Is Completely Safe for Humans

There are no documented cases of FCoV transmission to humans or other animals.

❌ MYTH: I Should Isolate or Put Down a Cat with FCoV

This is an extreme and unnecessary response to a common, mostly benign virus.

✅ FACT: Cats with FCoV Can Live Normally Alongside Others

With good hygiene and stress management, FCoV-positive cats can live full lives alongside other cats.

❌ MYTH: Vaccination Fully Prevents FIP

The vaccine has limited efficacy and does not guarantee protection against FIP.

✅ FACT: The Real Prevention Is Hygiene and Stress Reduction

Environmental management is far more effective than vaccination.

❌ MYTH: FIP Is Contagious Between Cats

This misconception causes unnecessary panic in multi-cat households.

✅ FACT: FIP Is NOT Contagious

FIP is the result of an internal mutation of the virus. What spreads is the common FCoV, not FIP.

9. Frequently Asked Questions

Can My Cat Give Me Feline Coronavirus?
No. Feline coronavirus (FCoV) is cat-specific and does not infect humans, dogs, or other animals. It is completely safe to live with a cat that has FCoV.
Should I Test My Cat for Feline Coronavirus?
In most cases, no. Tests only indicate exposure to the virus and cannot predict whether FIP will develop. It is better to focus on prevention (hygiene, stress reduction) and monitor clinical symptoms.
How Long Does the Virus Survive in the Environment?
Feline coronavirus is relatively fragile outside the cat. On dry surfaces it dies within a few hours. Regular cleaning with standard household detergents is sufficient to eliminate it.
Can I Have More Cats If One Has FCoV?
Yes.
Is There a Cure for Feline Coronavirus?
Common FCoV does not require a cure; most cats eliminate it naturally or coexist with it without problems. If it mutates to FIP, effective antivirals are available (GS-441524/Remdesivir) with cure rates of >90%.
Does Diarrhoea Mean My Cat Has FIP?
No. Mild and transient diarrhoea is common with enteric FCoV (benign). FIP presents with more serious symptoms: persistent fever, distended abdomen, breathing difficulties, progressive weight loss.

10. Resources and Veterinary Support

Reliable Medical Sources

When to Consult a Vet

📞 Seek Immediate Veterinary Attention If You Notice:

  • Persistent fever (more than 2 days)
  • Distended or swollen abdomen
  • Breathing difficulties
  • Progressive weight loss
  • Severe lethargy or behavioural changes
  • Jaundice (yellow mucous membranes)
  • Neurological signs (seizures, disorientation)
  • Changes in the eyes (iris colour, cloudiness)

Steps to Take Today

🎯 Immediate Action Plan

  1. Assess your situation: How many litter trays do you have? How often do you clean them?
  2. Improve hygiene: Follow the rule of 1 litter tray per cat plus 1 extra
  3. Reduce stress: Create safe retreat areas and maintain stable routines
  4. Monitor your cats: Watch for changes in appetite, energy levels, and stools
  5. Schedule a vet check-up: Annual examination or whenever symptoms arise
  6. Educate yourself: Read about FIP to recognise early signs

⚠️ Essential Medical Disclaimer

This guide is informational and educational. It does not replace professional veterinary consultation, diagnosis, or treatment.

REMEMBER: Having feline coronavirus is NOT a death sentence. The vast majority of cats live long, healthy lives with FCoV. Prevention is based on hygiene, stress reduction, and regular veterinary care.