FIV — feline immunodeficiency virus — is not a death sentence. Cats diagnosed with FIV can live for many years with proper management. Understanding how the virus progresses, what symptoms to watch for, and how to prevent transmission helps FIV-positive cats thrive.
Last reviewed: June 2026
What Is FIV and How Do Cats Get It?
Feline immunodeficiency virus (FIV) is a lentivirus in the same retroviral family as HIV, though it cannot infect humans. FIV infects and gradually depletes CD4+ T-lymphocytes — immune cells critical for fighting infections. As the immune system weakens over years to decades, FIV-positive cats become susceptible to opportunistic infections they would normally fight off easily.
The primary route of transmission is deep bite wounds — the kind that occur during territorial fights between cats. This means intact male outdoor cats are most at risk. Casual contact (shared food bowls, grooming, litter boxes) very rarely transmits FIV. As described in the AAFP Feline Retrovirus Guidelines, 2020, FIV prevalence in North America is approximately 2.5–5% of cats overall, rising to 15–30% in high-risk populations (feral, fighting outdoor males).
Kittens can acquire FIV from their mother during birth or nursing, though maternal antibodies make testing unreliable until 6 months of age.
What Are the Signs of FIV in Cats?
FIV progresses through stages, and many cats remain asymptomatic for years. Signs that indicate the immune system is becoming compromised include:
Recurring infections: Upper respiratory infections (sneezing, nasal discharge, conjunctivitis) that keep coming back, skin infections, bladder infections, or dental disease that seems disproportionately severe.
Chronic oral disease: Stomatitis and severe gingivitis are among the most common clinical presentations of FIV. The immune dysregulation drives intense inflammatory responses in the mouth. Affected cats may drool, have difficulty eating, and have significant halitosis.
Weight loss and poor body condition: Progressive muscle wasting and poor coat condition as the immune system fails to maintain normal metabolic function.
Lymphadenopathy: Enlarged lymph nodes, particularly in the early acute phase shortly after infection.
Neurological signs: In advanced cases, FIV can affect the central nervous system, causing behavior changes, dementia-like signs, or seizures.
Secondary opportunistic infections: Fungal infections, unusual parasites, or bacterial infections that a healthy cat would fight off.
Diagnosis and Testing
FIV is detected by an ELISA blood test that identifies antibodies to the virus. In-clinic rapid tests are widely available and provide results in minutes. Positive results in kittens under 6 months should be re-tested at 6 months due to maternal antibody interference.
A positive test means the cat is infected for life — FIV cannot be cleared. This is different from having "FIV disease": many infected cats remain in the asymptomatic carrier phase for years and live near-normal lifespans.
Management of FIV-Positive Cats
There is no curative treatment for FIV, but effective management significantly extends healthy lifespan:
Keep them indoors: Reducing exposure to pathogens that could take advantage of immune compromise is critical. Indoor-only FIV-positive cats live dramatically longer than outdoor ones.
Regular wellness exams: Every 6 months rather than annually to catch new infections early. Bloodwork twice yearly helps detect changes in immune status (monitoring lymphocyte counts and CBC).
Prompt treatment of secondary infections: FIV-positive cats need antibiotic or antifungal treatment immediately when infections arise — they cannot afford delay.
Dental care: More frequent dental cleanings (every 6–12 months for cats with stomatitis) significantly improve quality of life. Some cats with severe stomatitis benefit from full-mouth tooth extraction.
Nutrition: High-quality protein diet supports immune function. Per the WSAVA Global Nutrition Guidelines, 2011, nutritional adequacy is particularly important in cats with chronic disease.
Vaccination: FIV-positive cats still benefit from core vaccines but should receive only killed-virus or recombinant vaccines, as live-attenuated vaccines carry theoretical risk in immunocompromised individuals.
Keeping them away from FIV-negative cats: While casual contact transmission is low risk, to be fully safe FIV-positive and FIV-negative cats should ideally be housed separately or all cats in the household tested.
When to See a Vet
Call your vet today if:
- Your FIV-positive cat has a new respiratory infection, skin wound, or abnormal discharge
- Your cat is losing weight, has decreased appetite, or is developing mouth ulcers
- Lymph nodes feel enlarged around the jaw, armpits, or groin
- Diarrhea lasting more than 48 hours or recurrent vomiting
Go to the ER immediately if:
- Sudden neurological signs (seizures, falling over, sudden blindness)
- Severe respiratory distress
- High fever (ear hot to touch) combined with complete appetite loss and lethargy
- Suspected trauma or injury in an immunocompromised cat
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Frequently Asked Questions
Can an FIV-positive cat live a normal lifespan? Yes, many do. FIV-positive cats kept indoors, with regular veterinary monitoring and prompt treatment of secondary infections, commonly live 10–15+ years. The virus itself does not necessarily cause progressive disease in all cats — long-term asymptomatic carriers are common.
Is FIV contagious to dogs or humans? No. FIV is species-specific to cats and cannot infect dogs, humans, or other animals. Family members, including children, are not at risk.
My FIV-positive cat lives with FIV-negative cats — is that safe? The risk of casual transmission through shared bowls, grooming, and litter boxes is very low. The main risk is bite wounds. If the cats get along without fighting, the risk is minimal. Ask your vet to test all cats in the household and discuss their individual situations.
What does it cost to manage an FIV-positive cat? Bi-annual wellness exams cost $100–300 per visit including bloodwork. Dental cleanings run $300–800 for a basic cleaning or $800–2,500 if extractions are needed. Antibiotics for secondary infections run $30–100 per course. Annual costs for a well-managed FIV-positive cat typically run $500–1,500.
Is there a vaccine for FIV? A vaccine was previously available in the US but was withdrawn from the market. Currently, prevention relies on keeping cats indoors and preventing bite wounds. A new FIV vaccine is under development but not commercially available as of 2026.
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