Feline Leukemia Virus (FeLV) is a viral infection that affects cats, leading to various health issues. It is primarily transmitted through saliva, urine, and close contact with infected cats. FeLV can weaken a cat's immune system, making them more susceptible to other infections and diseases. Cats infected with FeLV may show symptoms such as weight loss, lethargy, and fever. There is no cure for FeLV, but regular veterinary check-ups and vaccinations can help manage the disease. Testing for FeLV is essential for early detection and to prevent its spread among feline populations.