The feline leukemia virus (FeLV) has no known cure, and it has not been clinically proven that any antiviral or other agent will extend the life of an infected cat. This disease affects the immune system of cats, and is often fatal.

FeLV, being a retrovirus, is able to insert copies of its own genetic material into the cells of the cat it has infected. This disease has a variety of signs and symptoms, many of which may be common to other conditions or diseases.

Healthy felines are attacked by harmful organisms all the time. Most of the time, your cat can fight them off. When your cat’s immune system is compromised, however, diseases that would not normally cause a problem can become more severe. In some cases, they can become life threatening.

With a weakened immune system, your cat is more susceptible to secondary infections and diseases. It’s these secondary infections, conditions and diseases that make the symptom list for this disease so varied. FeLV infected cats have a difficult time fighting off infections of any kind.

Some cats will experience no outward symptoms during the initial stages of the disease. Early FeLV symptoms may include general malaise, blood conditions, fever, and swollen lymph nodes.

Some FeLV infected cats may exhibit excessive urination and thirst, which is also common to a number of other conditions. They often will develop anemia, and some will develop tumors, leukemia, and other forms of cancer.

Additional feline leukemia virus symptoms may also include depression, weight loss to the point of emaciation, and diarrhea. Cats may also experience blood in the stool, jaundice, constipation, and chronic recurring infections.

There are two stages of feline leukemia virus. It’s possible that an infected cat may halt the progression of the disease at the first stage, but others are not so lucky.

If your cat has FeLV, the only thing you can do is to treat the secondary infections and diseases, and try to boost the immune system of your cat. This disease is usually fatal for those cats who reach the second stage of this disease.

According to professional sources, FeLV infections exist in about 2 to 3 percent of all cats. Infection rates are higher in high risk groups. If your cat is not in a high risk group, chances are limited that she will contract the disease. Since the disease is transmitted through contact with infected cats, keeping your cat indoors and away from infected cats is a good preventive measure.