This disease comes with a diverse symptom list. FeLV is a retrovirus, which means that it is able to insert copies of its own genetic material into the cells it has infected. This illness shares many symptoms in common with other diseases and conditions.

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.

FeLV infected cats have a difficult time fighting off infections and parasites. With a weakened immune system, your cat is more susceptible to secondary infections and diseases. The symptoms an infected cat experiences, to a large degree, are caused by these other diseases and conditions.

Initially, symptoms of FeLV may include blood disorders, fever, enlarged lymph nodes, and general malaise. It's possible for some cats, however, to experience no symptoms at the early stage.

FeLV infected cats are susceptible to developing leukemia as well as other forms of cancer. They often will develop anemia as well, and about 30 percent of infected cats will develop tumors. Some cats may exhibit excessive thirst and urination, which is also common to feline diabetes and other conditions.

As the disease progresses, sick cats may present with more and varied symptoms. Blood in the stool, constipation, jaundice, and recurring infections may be present. Feline leukemia virus symptoms may also include and diarrhea, severe weight loss, and depression.

There are two stages to this disease. Upon initial infection, some cats will fight off the illness and it will not progress to the second stage. Other cats will not be so fortunate and the disease will progress.

If your cat has FeLV that has reached the second stage, the only thing you can do is to treat the secondary diseases and infections, and attempt to strengthen the immune system of your cat. Unfortunately, the disease is usually fatal.

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.