Felv Vaccine For Cats

Feline leukemia virus (FeLV) is a virus that infects only cats. FeLV depresses the immune system and tends to lead to persistent infection. FeLV is an important cause of anemia in cats and can cause cancers of several types. It is found worldwide and is transmitted through the exchange of bodily fluids. There is no treatment to eliminate the FeLV virus from the body, and the disease is ultimately fatal. Therefore, preventing infection with FeLV through vaccination is highly recommended. For further details on this important disease, see the handout “Feline Leukemia Virus Disease Complex”.

Special blood tests have been developed to detect the presence of the virus in the cat’s blood. In general, these tests are very reliable, although rarely a false positive result occurs. In some situations, it may be necessary to confirm infection with through repeated blood testing at a later date.


  • The only feline leukemia virus vaccine shown to be effective against persistent viremia for 2 years after vaccination.
  • Superior Efficacy demonstrated vs. multiple FeLV vaccines
    • The ONLY USDA-licensed 2-Year Duration of Immunity (DOI) FeLV vaccine (Ideal for adherence to AAFP guidelines)
    • The ONLY vaccine to demonstrate efficacy over the long-term in a co-mingling study mimicking real life conditions
  • Proven safety profile-99% reaction-free in ongoing surveillance involving millions of doses
  • Available in combination with other Nobivac feline vaccines to provide broader disease protection
  • Optimal choice for all cats under 1 year of age and healthy indoor/outdoor cats of any age

Features of Felv Vaccine For Cats

FeLV vaccines have been available for many years and been continuously improved upon. They are helpful in preventing infection with FeLV and therefore in controlling FeLV-related disease. Unfortunately, no vaccine is 100% protective. When possible, do not allow your cat or kitten to come into close contact with known FeLV-infected cats or cats of unknown vaccination history. Based on recommendations by the American Association of Feline Practitioners, current research and expert opinion recommends FeLV vaccination for all kittens, and then on an as-needed basis for adult cats. Although the FeLV vaccine is not considered a core vaccine in adult indoor cats, it is highly recommended for cats that spend time outdoors. Your veterinarian can discuss the pros and cons of vaccinating your cat against this disease, based on her specific lifestyle and risk of exposure.

The FeLV vaccination protects cats against the symptoms of feline leukemia virus. It was first created and placed on the market in 1985. This vaccine has been approved by the United States Department of Agriculture (USDA). Pet parents can go to any veterinary clinic in the country and request the FeLV vaccine. This vaccination is not known to be required by any level of law in the US.

Clinical Signs

FeLV adversely affects a cat’s body in many ways. It is the most common cause of cancer in cats, may cause various blood disorders, and may lead to a state of immune deficiency that hinders a cat’s ability to protect itself against other infections. Because of this, common bacteria, viruses, protozoa, and fungi that usually do not affect healthy cats can cause severe illness in FeLV-infected cats. These secondary infections are responsible for many of the diseases associated with FeLV.

During the early stages of infection, it is common for cats to exhibit no signs of disease at all. Over time, however, (weeks, months, or even years) an infected cat’s health may progressively deteriorate or he/she may experience repeating cycles of illness and relative health. Signs can include:

  • Loss of appetite
  • Progressive weight loss
  • Poor coat condition
  • Enlarged lymph nodes
  • Persistent fever

Dosage and administration

  • Subcutaneous or intramuscular injection
  • Initial 1 mL dose administered at 9 weeks of age or older
  • Second 1 mL dose administered 3 to 4 weeks later
  • Contact your veterinarian or manufacturer for more information on revaccination frequency.
  • Available in a 25 x 1 mL dose presentation

Prices of Felv Vaccine For Cats


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