Feline Immunodeficiency Virus (FIV)
This page is educational reference material for preparing questions. A licensed veterinarian examines the animal, makes the diagnosis, and sets the treatment.
Understanding FIV in cats. Covers transmission, testing, stages, treatment, living with an FIV-positive cat, and multi-cat household management.
Causes and Risk Factors
Multiple factors can contribute to the development of this condition.
- Genetic predisposition: Certain breeds are at higher risk due to inherited traits
- Age: Some conditions are more common in kittens or senior pets
- Environmental factors: Diet, toxin exposure, stress, and living conditions play a role
- Underlying health issues: Other conditions may increase susceptibility
- Immune system status: Compromised immune function can predispose to disease
Symptoms to Watch For
Early detection significantly improves treatment outcomes. Watch for these signs.
- Changes in appetite, water consumption, or weight
- Behavioral changes including lethargy, restlessness, or hiding
- Physical symptoms specific to the affected body system
- Changes in bathroom habits (frequency, appearance, straining)
- Visible discomfort, pain response to touch, or changes in posture
- Respiratory changes, coughing, or labored breathing
When to See the Vet Immediately
Verify dietary decisions with your vet, because your cat's medical history is where the nuances actually live.
Diagnosis
FIV is diagnosed with an antibody test, which is the opposite of the FeLV antigen test. AAFP guidance treats a positive result in a healthy adult as something to confirm, because vaccination and maternal antibody can confuse the picture in some cats. Kittens can carry maternal antibody and are retested after that antibody should be gone. PCR is used in selected cases.
Treatment Options
No drug clears FIV. Infected cats are kept indoors, away from fights, and secondary illness is treated as it shows up. Dental disease and infections are common reasons they see the veterinarian. The veterinarian chooses the drug and the dose. The FIV vaccine does not treat a cat who already tests positive.
Prevention and Management
- Regular veterinary checkups (as recommended by the AVMA for all companion animals) for early detection (annually, or semi-annually for seniors)
- Maintain a healthy weight through proper nutrition and exercise
- Keep vaccinations and preventive medications current
- Breed-specific health screenings recommended by your veterinarian
- Provide a low-stress, enriched environment
- Follow your vet's recommendations for diet and lifestyle modifications
Cost of Treatment
Treatment costs vary based on severity and duration.
| Treatment Type | Estimated Cost Range |
|---|---|
| Initial Diagnosis | $200 – $800 |
| Medication (monthly) | $30 – $200 |
| Ongoing Management (annual) | $500 – $3,000 |
Common Questions About Feline Immunodeficiency Virus (FIV)
Is this condition curable?
Feline immunodeficiency virus is not cleared by any current drug. AAFP retrovirus guidelines describe infected cats that live for years indoors, and others that decline from chronic stomatitis, weight loss, or secondary infection. A positive antibody test in a kitten can be maternal antibody, so a retest is part of the diagnosis. Survival is management of those secondary problems.
How can I afford treatment?
FIV spending is dental procedures for stomatitis and treatment of bite-wound infections. Keeping the cat indoors and alone, or only with compatible housemates, avoids the emergency abscess bill. Ask your clinic what a dental extraction estimate looks like, because that is the procedure these cats often need. There is no FDA-approved drug that makes the test turn negative.
Editorially reviewed by the Pet Care Helper AI editorial team
Verified by Paul Paradis (editorial lead, Boston, MA) against the clinical references below. We are not a veterinary practice; see our medical review process and editorial team for the full workflow.
Cross-checked against:
- ISFM Feline Medicine Guidelines — feline-specific guidance
- Cornell Feline Health Center — client-facing feline reference
- Journal of Feline Medicine and Surgery (JFMS) — peer-reviewed feline literature
- Merck Veterinary Manual — clinical reference
Spotted an error? Email corrections@petcarehelperai.com. Published corrections are logged in our corrections log.
Cornell Feline Health Center describes FIV as a lentivirus passed mainly by deep bite wounds, which is why intact outdoor males test positive more often than indoor neutered cats. An antibody ELISA can read positive in a kitten that only carries the mother's antibodies, and clinics often repeat the test after six months of age. Chronic stomatitis, with gums that stay red along the teeth, is a common reason these cats need a dental procedure. Indoor housing is the prevention step AAFP emphasizes for a cat that tests positive.