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What Is Feline Leukemia Virus

Updated on November 2, 2011

Feline Leukemia Virus (FeLV) is part of a larger group of viruses, known as retrovirus. FeLV is thought to be among the biggest threats to cats health across the globe. FeLV is closely related to Feline Immunodeficiency Virus (FIV), as well as to HIV. While it is a deadly threat to a cat's health, it is not believed to be communicable between cats and humans, or vice versa.

FeLV is generally passed from one cat to another through saliva, tears, or fecal matter. It's carried throughout the cat's body in the blood stream, and can eventually result in lymphosarcoma, or feline leukemia. Feline leukemia virus is believed to be the leading cause of cancer in cats, and the second leading cause of death in cats, after accidents. Veterinarians and other cats health experts have reported that more than 20% of sick cats have FeLV, and 30% of malignant tumors in cats are the result of the feline leukemia virus.

How Is Feline Leukemia Virus Spread

The most common means of spreading FeLV is through saliva. Usually this means being bitten by another cat that carries the virus, but that's not the only way feline leukemia virus threaten your cat's health. Other possible, though less likely ways for your cat to come in contact with it are through:

• Mutual grooming
• Sharing a food or water bowl with an infected cat
• Sharing a litter box with an infected cat
• Insect bites, such as from fleas or mosquitoes

What Are The Symptoms Of Feline Leukemia Virus

As far as symptoms go, that can be a little tricky. Since FeLV suppresses the immune system, any change in your cats health could technically be a symptom. But in general, a chronic illness, or any health problem that doesn’t improve with traditional treatment is a sure sign that your cat should be tested. Some other common symptoms include:
• Anemia
• Diarrhea, constipation, or blood in the stool
• Weight loss
• Loss of appetite
• Excessive drinking and urinating

It is also possible that, once a cat is infected with FeLV, the virus could lie dormant for years. In this case, you may never see any symptoms.

Feline Leukemia Treatment

Since it is a virus, there is no cure for FeLV. The good news, however, is that 70% of infected cats develop an immunity, and can live a normal life. Others may develop immunities, but suffer breakouts later in life. This is especially true if they suffer a stressful trauma, or are given some types of medications. Always make sure your vet has a complete medical history so he knows to avoid these meds. Otherwise, your cat's health could be seriously threatened.

Historically, the only treatment for cats that were unable to fight off the virus has been to lessen symptoms with antibiotics and blood transfusions; and treating tumors with chemotherapy. Recently, though, the USDA granted license for a drug specifically formulated for symptoms of FeLV, as well as FIV.

Of course, the best treatment is prevention. Basically, this means a well balanced diet, no table scraps, no raw eggs or meats. Plenty of water is important, as well as closely monitoring your cat's health and behavior, and reporting any changes to your vet. Semi-annual physicals are imperative.

Vaccinations are also available. They are typically delivered in two doses, three weeks apart. Annual boosters are required, and some vaccinated cats still get FeLV. The vaccinations have a success rate approaching 95%.

Keep Your Cat Indoors and Safe From Feline Leukemia Virus
Keep Your Cat Indoors and Safe From Feline Leukemia Virus

Keep Your Cat Indoors

The only reliable way to protect your cats health and keep them free from feline leukemia virus is to prevent them from coming in contact with it altogether. The only way to do that is to keep them in the house. If you must let your cats out to roam, you should have them tested periodically, because they may not show symptoms for months, or even years after being infected.

Also keep in mind that an outdoor cat's life expectancy is far shorter than that of an indoor cat. Aside from feline leukemia virus, an outdoor cat is vulnerable to chemicals and poisons, parasites, predators, angry neighbors and speeding cars, among other things. On average, an outdoor cat lives for about five years. Happy and healthy indoor cats, on the other hand, don’t face the same kinds of dangers, and usually live 12 to 15 years. Some even reach the age of 20. A good argument against letting them out, no matter how much they think they want it.

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    • rmr profile imageAUTHOR

      rmr 

      6 years ago from Livonia, MI

      Hi dallas93444. Thanks for stopping by and adding to the discussion!

    • dallas93444 profile image

      Dallas W Thompson 

      6 years ago from Bakersfield, CA

      Glad you introduced this topic. Feline Leukemia Virus may cause a massive outbreak of latent T. gondii. Anything that causes the cats immune system to be weakened can give the parasite T. gondii an opportunity to trasform from a latent infection to a very sick cat and worse the spread of T. gondii. Most of the world is infected by the parasite. There is no cure. It changes behaviors. It is the third leading cause of food related deaths. T. gondii is especially dangerous to first trimester pregnant women. Horrible things may happen to the fetus, including death...

      T. gondii MUST live inside a cat's intestine for sexual reproduction. Keeping your cat indoors may protect your cat. All warm blooded animals are suceptable.. Sea lions in Morro Bay, California are dying from T. gondii from cat feces being dumped into toilets, (sewer plants do not eradicate T. gondii) rain water draining into the ocean... Clams, anchovies, whales in the Artic have T. gondii. It is ubiquitos...

      T. gondii changes our cultures... Brazil has a high cat population... France has a high cat population. One of the systoms of T. gondii changing behaviors is the infected women are more attractive to infected males... Most motorcyle riders are infected. It creates risk seeking behaviors in men... Car accidents are 2.5 times more with infected men... Brain cancers are related to T. gondii, schizophrenia - bi-polar are both associated with T. gondii (70% of them are infected with T. gondii).

      I am not a cat hater. I simply want to create an awareness of the dangers from allowing cats to mix with feral cats.

      Municipal drinking water supplies have been infected with T. gondii.. One in particlar is in British Columbia. T. gondii has been found in wells...

      T. gondii is being dumped into the California State Water Project. 25 million people drink this water.

      How come people have not heard about T. gondii? Although it was discovered in 1902 as the cause of sheep abortions and present in people in the 1970's... it was thought to be a benign parasite. Most of the time we experience flu-like systeoms and that is the end of it... In the 70's the drastic cause and effect of birth defects/deaths in children was determined to have a cause and effect relationship with T. gondii. Since the 2000's we have began to be understand... the far-reaching gloabal effects of T. gondii...

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