Feline Panleukopenia Virus (FPV), frequently referred to as feline distemper or feline infectious enteritis, is a severe, highly contagious viral disease. It is caused by the feline parvovirus, which is closely related to the virus that causes parvovirus in dogs.

The virus aggressively attacks the rapidly dividing cells in a cat's body. This primarily affects the cells in the intestinal tract, bone marrow, and developing foetuses. By destroying white blood cells (leukocytes), the virus severely compromises the cat's immune system, leaving them highly vulnerable to secondary infections.

Because it is so dangerous, understanding when to test for serious conditions is vital. FPV is one of the core diseases that cats are routinely vaccinated against, but unvaccinated kittens and adult cats remain at extreme risk.

The symptoms of FPV can appear suddenly and escalate rapidly. Early signs often include profound lethargy, a significant loss of appetite, and a high fever. Owners frequently notice their cat sitting hunched over their water bowl without actually drinking.

As the virus attacks the intestinal tract, severe vomiting and profuse, often bloody diarrhoea develop. This leads to extreme, life-threatening dehydration. The cat's abdomen may also be very painful to the touch.

If you notice any of these severe digestive symptoms, you should test immediately. You can read more about testing for digestive issues on our blog, though FPV requires much more urgent action than typical stomach upsets.

This rapid antigen test is highly accurate when used correctly during the active shedding phase of the virus. It uses the same diagnostic technology that many veterinary clinics rely on for quick, in-house results.

The test is specifically designed to detect the FPV antigens present in a cat's faeces or vomit. A positive result (two lines) is a very strong indicator that the virus is present and active in your cat's system.

However, false negatives can occasionally occur if the test is performed too early or too late in the infection cycle when viral shedding is low. Following our tips for accurate home testing will help ensure you get the most reliable result possible.

FPV is incredibly contagious and resilient; it can survive in the environment for over a year and is resistant to many common household disinfectants. Cats primarily acquire the infection through contact with the faeces, urine, or vomit of an infected cat.

However, direct contact isn't necessary. The virus can be easily carried on the shoes, clothing, and hands of people who have handled infected animals. It can also spread via contaminated food bowls, bedding, litter trays, and even fleas.

This environmental resilience is why outbreaks are so common in multi-cat environments like shelters or feral colonies, and why rigorous hygiene and vaccination are so critical for prevention.

A positive result for FPV is a medical emergency. You must contact your veterinary clinic immediately and inform them that your cat has tested positive for feline panleukopenia so they can prepare an isolation area.

There is no specific medication that kills the virus; treatment focuses entirely on aggressive supportive care. This usually involves intravenous fluids to combat severe dehydration, anti-nausea medications, and broad-spectrum antibiotics to prevent secondary bacterial infections while the cat's immune system is compromised.

If a cat receives prompt, intensive veterinary care and survives the first 48 hours of the illness, their chances of making a full recovery increase significantly. Once recovered, they will have lifelong immunity to the virus.

The FPV vaccine is considered a 'core' vaccine for cats and is highly effective. If your cat is fully up-to-date with their vaccinations, their risk of contracting cat distemper is extremely low.

However, no vaccine offers 100% protection. In rare cases, a vaccinated cat might contract a mild version of the illness if exposed to a very high viral load, or if their immune system was compromised when the vaccine was administered.

The highest risk group remains young kittens (before they have completed their primary vaccination course) and unvaccinated adult cats. If your vaccinated cat is showing severe symptoms, it is still worth testing, but other causes should also be urgently investigated by your vet.

The FPV vaccine is considered a 'core' vaccine for cats and is highly effective. If your cat is fully up-to-date with their vaccinations, their risk of contracting cat distemper is extremely low.

However, no vaccine offers 100% protection. In rare cases, a vaccinated cat might contract a mild version of the illness if exposed to a very high viral load, or if their immune system was compromised when the vaccine was administered.

The highest risk group remains young kittens (before they have completed their primary vaccination course) and unvaccinated adult cats. If your vaccinated cat is showing severe symptoms, it is still worth testing, but other causes should also be urgently investigated by your vet.

The test cassette is designed to work effectively with either a faecal (poo) sample or a vomit sample, as the virus is shed heavily in both during an active infection.

Generally, a faecal sample is preferred as it often contains the highest concentration of viral antigens. If your cat is experiencing severe diarrhoea, a swab from the loose stool is ideal. However, if your cat is vomiting frequently but has not passed stool, a vomit swab is a perfectly acceptable and effective alternative.

Ensure you only use a small amount of the sample to coat the cotton swab. Overloading the swab with too much solid matter can clog the test cassette and prevent the liquid from flowing correctly.

Feline Panleukopenia Virus is highly specific to felines and a few related species (like raccoons and mink). It cannot infect humans, so you are not at risk of catching the disease from your cat.

While FPV is closely related to Canine Parvovirus (CPV), the feline virus does not typically cause illness in dogs. However, certain strains of the canine parvovirus *can* infect cats.

Even though you cannot catch it, you can act as a carrier. If you have been in contact with a cat suffering from FPV, you must wash your hands thoroughly and change your clothes before interacting with any other unvaccinated cats to prevent spreading the infection.

Reading the test cassette is very similar to reading a standard lateral flow or pregnancy test. You must check the results at exactly the 5-minute mark for the most accurate reading.

If only one coloured line appears in the control area (marked 'C'), the result is negative. If two coloured lines appear—one in the control area ('C') and one in the test area ('T')—the result is positive, indicating the presence of the virus. Even a very faint line in the 'T' area should be considered a positive result.

If no line appears in the 'C' area, the test is invalid, regardless of whether a 'T' line appears. This usually means insufficient sample was added or the cassette was damaged, and you will need to retest using a new kit. For more reassurance on testing procedures, read our self-testing questions answered guide.