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  • Post published:01/04/2021
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Panleukopenia is a viral disease of cats often called feline distemper however it is more closely related to parvovirus. It is highly contagious and can be fatal, especially in kittens. It is one of the diseases for which cats are routinely vaccinated (the “P” in combination FVRCP vaccines).

Once a leading cause of death in kittens, panleukopenia has been mostly eradicated thanks to the vaccine, and it’s not contagious to humans. But unvaccinated cats, such as stray or feral cats, are still at risk, especially kittens.

What Is Panleukopenia?

Feline panleukopenia is a disease caused by a type of parvovirus very closely related to the parvovirus found in dogs. The virus can be spread by direct contact with infected cats but also indirectly by contact with items contaminated with the virus.

The virus survives a long time in the environment and is resistant to many disinfectants, so most cats will be exposed to this virus at some point.

Signs and Symptoms

Symptoms of panleukopenia can include:

  • Fever, Lethargy
  • Loss of appetite
  • Vomiting and Diarrhea

Lethargy and mood issues can be difficult to detect in cats, who typically spend much of their time snoozing, but if your cat isn’t showing interest in toys it usually likes or seems to avoid contact with you, these can be signs of it is not feeling well.

The virus also causes a marked decrease in white blood cells, leaving affected cats susceptible to a secondary bacterial infection. Dehydration and secondary bacterial infections are often life-threatening in these instances.

Panleukopenia damages the intestines, and like parvovirus in dogs, attacks the infected animal’s bone marrow and lymph nodes.

When pregnant cats are infected, their kittens may be stillborn or suffer other developmental abnormalities. Some kittens infected in the later stage of pregnancy or neonatal phase can survive but the virus may affect their brain development, causing the kittens to be born with a condition called cerebellar hypoplasia which damages the part of the brain that affects their motor control.

Kittens born with this condition often suffer tremors and other health issues if they survive at all.


The diagnosis of panleukopenia is often based on history, symptoms, and physical exam. A blood count may reveal a decrease in all types of white blood cells (which is actually the definition of “panleukopenia”).

Laboratory tests can be done to check for the presence of the virus as well.


The cause of feline panleukopenia is feline parvovirus (FPV). Cats can develop FPV when they come into contact with feces, vomitus or other bodily fluids that are infected with FPV. The FPV virus can also be spread via humans who have been in contact with other cats that have FPV and didn’t wash their hands or change clothes. Materials like bedding or food dishes that are shared between cats can also spread the virus.


There is no cure for the panleukopenia, so treatment is aimed at managing the symptoms while the cat’s immune system fights the virus. Hospitalization is usually required, and intravenous fluids are usually necessary to stave off dehydration. This can be costly and prognosis should be discussed with the vet as often it is poor.

Antibiotics will not affect the virus, but your veterinarian may prescribe them to prevent or fight secondary bacterial infections, and medication to reduce vomiting may also be used. In severe cases, blood transfusions may be necessary.

Kittens under 5 months are usually the most severely affected, and even with intensive treatment, the outcome can be fatal.

Home Care

A cat with panleukopenia should be isolated from other kittens or susceptible cats. Treatment options should be discussed with your veterinarian. After the symptoms clear up, infected cats can still spread the virus for several weeks. If you have a multi-cat household discuss precautions to take, including disinfection, with your vet.

Litterboxes should not be shared among infected cats or non-infected cats for several weeks after treatment, if ever.


Vaccinations provide good protection against panleukopenia and are part of the core vaccines routinely given to cats. Your vet will recommend a series of vaccines (usually starting at 6 to 8 weeks of age), and it is important to follow this schedule as the vaccinations are not totally ​protective until the full series is given. Different types of vaccines are available, and your vet can help you choose the one right for your cat.

Keeping kittens and cats indoors and away from other unvaccinated cats is the best way to prevent exposure to the virus.

Since the virus survives for so long in the environment, if you have had a cat with panleukopenia, talk to your vet about precautions to take before introducing any new kittens or unvaccinated cats into your home.

A diluted bleach solution to clean surfaces and left with appropriate contact time will kill the panleukopenia virus but cannot be used on all surfaces that might harbor the virus. Any soiled bedding and soft toys an infected cat may have used or played with should be discarded.

If you suspect your pet is sick, call your vet immediately. For health-related questions, always consult your veterinarian, as they have examined your pet, know the pet’s health history, and can make the best recommendations for your pet.
Article Sources
The Spruce Pets uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. Feline panleukopenia. American Veterinary Medical Association

  2. Feline Panleukopenia. Merck Veterinary Manual

  3. Feline Vaccines: Benefits And Risks. Cornell University College Of Veterinary Medicine

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