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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.

This disease has a varied list of symptoms and signs, many of which may be common to other illnesses and conditions. FeLV is a retrovirus, which means that it is able to insert copies of its own genetic material into the cells it has infected.

Healthy cats, like healthy people, are attacked by organisms all the time. Most of the time, both felines and humans can fight them off. When your cat’s immune system is compromised, however, opportunistic infections and parasitic organisms are more likely to thrive and cause damage.

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 often will develop anemia. About 30 percent of infected cats will develop tumors. Leukemia and other forms of cancer are possible outcomes. Some cats may exhibit excessive urination and thirst, which is also common to other illnesses such as feline diabetes.

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.

In fact, it’s estimated that only about 2 to 3 percent of all cats are infected with FeLV. Infection rates are higher in high risk groups. The disease is transmitted through direct contact with an infected cat. Keeping your cat indoors and away from infected cats is a good precaution. Fortunately, if your cat is not in a high risk group, chances are limited that she will contract the disease.

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