What are FIV and FeLV in cats?

FIV (Feline Immunodeficiency Virus) is a retrovirus that attacks the cat's immune system — similar to HIV in humans, but not transmissible to humans at all. Cats with FIV cannot be fully cured, but many live 5–10 years or longer without serious symptoms when properly cared for. FeLV (Feline Leukemia Virus) is a different, more aggressive retrovirus — it attacks the bone marrow and immune cells, and can cause anaemia, lymphoma, and recurrent opportunistic infections. FeLV is far more easily transmitted between cats and has a worse long-term prognosis than FIV.

What are the symptoms of FeLV in cats to watch out for?

FeLV symptoms in cats are often non-specific and appear gradually. The most commonly reported include: progressive weight loss, pale gums (a sign of anaemia), intermittent fever, recurrent upper respiratory infections (sneezing, nasal discharge, watery eyes), severe stomatitis (red, bleeding gums), chronic diarrhoea, enlarged lymph nodes in the neck or armpits, dull and shedding coat, and slow-healing skin lesions. In advanced stages, tumours (lymphoma) or acute leukaemia can appear. Because these symptoms overlap with many other illnesses, an FIV/FeLV blood test is the only way to confirm diagnosis.

How are FIV and FeLV transmitted between cats?

FIV is transmitted mainly through deep bite wounds during fights — most commonly in unneutered outdoor male cats. Transmission through casual contact (sharing bowls, mutual grooming, sleeping together) is very low. FeLV is far more contagious: through saliva, nasal discharge, urine, and mutual grooming between cats living in the same household. Kittens can be infected by their mother in utero, through milk, or through grooming. That is why FeLV is far more dangerous than FIV in multi-cat households. Neither virus is transmissible to humans, dogs, or other animals.

How is an FIV/FeLV-positive cat treated?

No drug can eliminate FIV or FeLV virus — both are retroviruses that integrate into the host's DNA. Treatment focuses on long-term management: (1) treat opportunistic infections promptly (antibiotics, antifungals, or antivirals as indicated), (2) routine 6-monthly checkups with full blood work to monitor anaemia and organ function, (3) premium cooked nutrition (avoid raw food due to weakened immunity), (4) keep the cat indoor to prevent outside pathogen exposure, (5) minimise stress with a stable environment and adequate enrichment. For advanced FeLV with lymphoma, chemotherapy may be considered with your vet. Regular veterinary consultation is essential because each cat progresses differently.

Are there FeLV and FIV vaccines for prevention?

The FeLV vaccine is available in Indonesia and is recommended (non-core but important) for cats that go outdoors, live with other cats, or are newly adopted. FeLV vaccine effectiveness is around 70–80% — not absolute, but significant protection. An FeLV test is mandatory BEFORE the first vaccination. The FIV vaccine is not widely available in Indonesia, and its effectiveness remains debated. The best FIV prevention is still: neutering male cats to reduce fighting, and keeping cats indoors.

My cat tested FIV positive — does it need to be euthanised?

Not necessarily, and do not rush. Many FIV-positive cats live comfortably for 5–10 years or longer with good quality of life, provided: they do not fight other cats, receive routine 6-monthly checkups, have balanced nutrition, minimal stress, and any opportunistic infection is treated quickly. Euthanasia is only considered when quality of life has deteriorated severely, the cat has stopped eating and drinking, or is suffering uncontrollable pain — and even then, it is a decision made with your vet, never automatic from a positive test result.

FIV & FeLV in Cats: Symptoms, Transmission, Treatment (Vet)

Receiving a positive FIV or FeLV test result is a difficult moment for any cat owner. But before panicking or thinking about euthanasia: a positive diagnosis does not automatically mean your cat needs to leave your life. With the right understanding and proper care, many FIV/FeLV cats can live comfortably and happily for years.

This article explains what FIV and FeLV are, the symptoms to watch for, how the viruses spread, treatment and long-term management, and prevention through FeLV vaccination and neutering.

What Is FIV vs FeLV?

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FIV (Feline Immunodeficiency Virus) and FeLV (Feline Leukemia Virus) are both retroviruses that attack cats, but their behaviour and severity differ. FIV is similar to human HIV — it slowly suppresses the immune system, the latent phase can last years, and cats often appear healthy for a long time. FeLV is more aggressive — it attacks the bone marrow and blood cells, can cause severe anaemia and cancer (lymphoma), with a shorter average life expectancy.

Important to understand: neither virus is transmissible to humans. You can safely pet, hug, and care for an FIV/FeLV-positive cat. The risk is only to other cats in the household.

FIV vs FeLV Comparison Table

Factor	FIV	FeLV
Full name	Feline Immunodeficiency Virus	Feline Leukemia Virus
Main route of transmission	Deep bite wounds (fighting)	Saliva, nasal discharge, grooming, mother to kitten
Ease of transmission	Low (casual contact is safe)	High
Long-term prognosis	Relatively good (can reach 10+ years)	More serious (average 2–3 years)
Vaccine available in Indonesia?	Not widely available	Yes (recommended for at-risk cats)
Transmissible to humans?	No	No

FeLV Symptoms in Cats — What to Watch For

The early phase of both FIV and FeLV is often asymptomatic for months or even years. Symptoms appear when immunity weakens and the cat becomes vulnerable to opportunistic infections. Because the signs are non-specific, many owners only realise something is wrong after recurrent illness.

Signs that warrant an immediate vet visit:

Recurrent upper respiratory infections (sneezing, nasal discharge)
Swollen, red, bleeding gums (stomatitis)
Unexplained weight loss
Intermittent fever

Enlarged lymph nodes (neck, armpits)
Dull, thinning coat
Skin infections, slow-healing wounds
Anaemia (pale gums) — more common with FeLV

Because these symptoms also occur in many other illnesses (e.g. cat flu, parasites, or kidney disease), a blood FIV/FeLV test is the only way to confirm diagnosis. Rapid tests need only a few drops of blood and produce results in 10–15 minutes.

How FIV/FeLV Spread Between Cats

Understanding the transmission routes helps you avoid both panic and complacency about the risk to other cats in the household.

FIV — Deep bites during fighting. Most common in unneutered outdoor male cats. The FIV virus is in saliva and enters through deep bite wounds. Casual contact (sharing bowls, sleeping together) carries very low risk.
FeLV — Casual contact between housemates. The FeLV virus is in saliva, nasal discharge, urine, and faeces. Transmission happens through mutual grooming, shared water bowls, or simply sleeping in close contact. Kittens can be infected by their mother in utero or through milk.
Not transmissible to humans, dogs, or other animals. FIV and FeLV are species-specific — they only infect cats.
Not airborne over distance. Both viruses are fragile outside the cat's body and quickly killed by ordinary household disinfectants.

For this reason, every new cat entering your home must be tested for FIV/FeLV before being mixed with existing cats — especially if you adopt from a shelter, the street, or an adult cat with unclear history.

Treatment & Care for FIV/FeLV Cats

No drug can eliminate FIV or FeLV virus — both are retroviruses that integrate into the host's DNA. But "no cure" does not mean "no hope". Proper management can significantly extend life expectancy and maintain a good quality of life.

5 Pillars of Managing an FIV/FeLV-Positive Cat

1. Routine Checkup Every 6 Months

Early detection of opportunistic infection is key. A complete blood count (CBC + chemistry) every 6 months helps monitor anaemia, kidney and liver function, and early signs of lymphoma. When to see a vet immediately if new symptoms appear — do not wait.

2. Premium Cooked Nutrition

High-quality food with adequate protein. Avoid raw food (BARF) for FIV/FeLV cats — the risk of pathogenic bacteria (Salmonella, E. coli) is much higher because of weakened immunity. Choose premium wet or dry food from veterinary-formulated brands.

3. Indoor-Only & Minimise Stress

Stress accelerates immune decline. A stable environment, consistent routine, and adequate enrichment (toys, cat tree, sunny spot) maintain mood and immunity. Indoor-only also protects from outdoor pathogens and prevents transmission to neighbourhood cats.

4. Treat Secondary Infections Quickly

Stomatitis, respiratory infection, skin infection, or diarrhoea in FIV/FeLV cats should not be left to "heal on its own" — their immunity is not strong enough. Visit the vet as soon as symptoms appear. Antibiotics, antifungals, or antivirals are given as indicated.

5. Routine Vaccination Remains Important

FIV/FeLV cats still need FVRCP and rabies vaccines to protect against other diseases — but use inactivated (killed) vaccines, not live vaccines. Discuss with your vet first. See also at-home cat vaccination guide.

"Many of the FIV-positive cats I treat live to 12–15 years old with good quality of life. The keys are consistent checkups, cooked nutrition, and never waiting if symptoms appear — immunocompromised cats do not have the reserves to "wait until tomorrow"."

— drh. Muhammad Arif, Birawa Vet

Prevention: FeLV Vaccine & Neutering

Prevention is far cheaper and more effective than treatment. Three steps proven to significantly lower FIV/FeLV risk:

FeLV vaccine for at-risk cats — outdoor cats, multi-cat households, or newly adopted cats. Effectiveness 70–80%. An FeLV-negative test is required before the first vaccine. See cat vaccination service in Jakarta.
Neuter male cats — drastically reduces fighting and therefore FIV risk. Neutering also lowers the risk of escaping, urine marking, and testicular tumours. See cat neutering service and best age to neuter a cat.
Indoor-only lifestyle — indoor cats have far lower FIV/FeLV risk, live on average 3–5 years longer, and do not spread virus to the feral cat population.
FIV/FeLV testing for all new cats before introducing them to existing cats. Quarantine 2–4 weeks in a separate room.

Medical disclaimer: This article is educational and does not replace direct veterinary consultation. FIV/FeLV are serious diseases requiring individual diagnosis and treatment plans based on your cat's specific condition. For positive test results or suspicious symptoms, consult a trusted vet promptly.

Think Your Cat May Need an FIV/FeLV Test?

Birawa Vet can perform FIV/FeLV testing and management consultations at your home across South Jakarta, BSD, and surrounding areas. Your cat avoids the stress of clinic travel — the blood sample is taken at home, rapid test results in 15 minutes, and findings are discussed directly with the vet on the spot. For newly diagnosed cats, we also help plan 6-monthly checkups and nutrition recommendations.

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