Feline Leukemia Virus
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.
Feline leukemia virus (FeLV) and feline immunodeficiency virus (FIV) are retroviruses with a global impact on the health of domestic cats . The two viruses differ in their potential to cause disease. FIV can cause an acquired immunodeficiency syndrome that increases the risk of developing opportunistic infections, neurological diseases, and tumors.
Feline Leukemia Virus Brochure

In chronic leukemia , the abnormal cells are more mature. Counts of other cells usually remain normal. Affected cats often have few symptoms, respond better to treatment, and survive longer. Lymphoma is a cancer related to leukemia that involves lymphocytes and usually starts in the lymph nodes or lymphoid tissues, such as the spleen.
White Blood Cell Disorders, Leukemia, and Lymphoma of Cats
Learn about the veterinary topic of White Blood Cell Disorders, Leukemia , and Lymphoma of Cats . Find specific details on this topic and related topics from the Merck Vet Manual.

Knowing a cat's feline leukemia and feline immunodeficiency virus status can help us make recommendations regarding health management for your cat . Neither virus is curable. Both can cause various clinical signs, most commonly anemia or inability to fight off even simple infections due to compromise of the immune system.
Feline Leukemia Virus Disease Complex
What is feline leukemia virus (FeLV)? Feline leukemia virus (FeLV) is a virus that infects cats . It was first identified in cats that had a form of leukemia (cancer of the white blood cells), but it is now known to cause a range of serious health problems. FeLV depresses the immune system, making infected cats more prone to infections, anemia, and certain cancers. Like all viruses, FeLV can ...

This particular example perfectly highlights why Leukemia In Cats With Leukemia Related Immune Deficiency Syndrome is so captivating.
Leukemia means white blood cells (leukocytes) within the blood (emia). With the feline leukemia virus (FeLV) the number of white blood cells is drastically abnormal—either higher or lower than normal. This leads to tumors and overwhelming infections. Leukemia in cats is a contagious disease that causes two potentially fatal problems in cats : Immune system failure, and/or Tumor development ...
Feline Leukemia Virus Disease
Learn about the veterinary topic of Feline Leukemia Virus Disease. Find specific details on this topic and related topics from the MSD Vet Manual.