【Detection purpose】 Feline leukemia virus (FeLV) is a retrovirus that is widespread among felines worldwide.After cats are infected with the virus, the risk of developing tumors, such as lymphoma, is greatly increased; it can cause abnormal coagulation function or other blood diseases, such as regenerative/non-regenerative anemia; it can also cause the immune system to collapse, causing hemolytic anemia , glomerulonephritis and other diseases. Feline Immunodeficiency Virus is a disease caused feline AIDS. It is related to the HIV virus that causes AIDS in humans in terms of structure and nucleotide sequence. It also often produces clinical symptoms of immunodeficiency similar to that caused by human AIDS, but HIV in cats is not transmitted to humans. Therefore, reliable and effective detection has a positive guiding role in prevention and diagnosis and treatment.