FIV stands for “feline immunodeficiency virus.” This is a virus in the same group as HIV, but it is specific to the cat family and can’t cross over into people or other animals.
There are many misconceptions about FIV, the most extreme one being that every cat with FIV is sick and/or highly contagious and should be euthanized. This is not supported by facts.
What does a FIV-positive test mean?
Let’s start with what an initial positive FIV test means, because this can cause a lot of confusion. The most common test is a point-of-care rapid test, conceptually similar to the COVID rapid antigen test. Unlike the COVID antigen test, though, it detects antibodies, a footprint of the immune response to the virus, and not traces of the virus itself. This is important because, in a kitten under 6 months of age, a positive antibody test means that the kitten almost certainly obtained these antibodies by drinking milk from its (FIV-positive) mother. These kittens are nearly always truly FIV-negative because it’s almost unheard of for this particular virus to pass directly from the mom to the kitten. A test at 6 months of age or older can help confirm this.
If a cat has a positive antibody test after 6 months of age, in most cases they really do have FIV infection. FIV is usually spread through deep bite wounds, and is a disease found mostly in adult cats, especially sexually active males.
Will this cat give FIV to my other cat(s)?
The answer is no. FIV can’t spread easily. The virus dies very quickly outside the cat’s body, usually within minutes. Just living with another cat with FIV, in a normal home environment, does not result in spread. Even if cats don’t like each other, it’s extremely unlikely that their dislike will result in the kind of deep bite wounds that FIV requires to infect another cat. (This is, of course, assuming that the cats are spayed or neutered. If they are intact and breeding, that’s another matter altogether.)
What does this diagnosis mean for me and my cat? Does having FIV mean my cat is sick, or will definitely get sick at some point?
Cats with FIV do have the potential to develop immune deficiency, and this can lead to chronic or unusual infections. The good news is that many cats with FIV will never develop clinical immune deficiency. In my experience with shelter cats in Toronto, when cats with FIV do have clinical signs of infection, it’s typically a mild intermittent cold, or sometimes a mild infection after a “dirty” surgery like dental extractions. We have just not seen the same kind of disease progression that we sometimes see with feline leukemia virus (a totally different virus with some similar features). And when our FIV-positive cats do get sick with regular cat ailments, they respond well to standard treatments.
Do FIV-positive cats make good companions?
Well, they are all different, so there’s no one answer. That said, there certainly is a “type” that we in the sheltering world all know and love. The “typical” FIV-positive cat is a big tom, with big cheeks, a can-do attitude, and a collection of scars from his life outdoors. Those who are comfortable around people are likely to be cats who were socialized when young and were later lost or abandoned. They have big hearts and big personalities and make wonderful, loving family members.
Should cats with FIV be managed differently from other cats?
Not really. What we want for all cats is regular veterinary visits, to be up to date on vaccinations and deworming, and to receive a high-quality, balanced diet. Raw food diets are highly discouraged for FIV cats due to their higher pathogen load. Good primary health care is particularly important for cats that might have immune deficiency. We also recommend that these cats should not have access to the outdoors to limit their exposure to infectious diseases. However, the AAFP (American Association of Feline Practitioners) guidelines point out that, for cats that will be highly stressed with an indoor-only lifestyle, being allowed outdoors, including a working cat placement, can be considered. This does not pose a risk to other cats they may encounter – again assuming they are first spayed or neutered to prevent high-risk behaviours.
Adopters may worry that a FIV-positive cat will soon get sick. This is unlikely, as these cats typically have a normal lifespan. If they do develop signs of FIV immune suppression, it’s up to each family to decide how they want to proceed. There are a few medications that might help suppress the virus, but the benefits for cats have not been proven as they have been in people. We counsel adopters to focus on maintaining a good quality of life for their FIV-positive cats. All cats, even those with a FIV-positive diagnosis, deserve a second chance in a loving home.
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