Feline leukemia virus

Feline leukemia virus (FeLV) is a retrovirus that infects cats. FeLV can be transmitted from infected cats when the transfer of saliva or nasal secretions is involved. If not defeated by the animal's immune system, the virus can be lethal. The disease has a wide range of effects: the virus can cause various blood disorders, and it can lead to an increased risk of certain cancers.

Transmission

FeLV is primarily spread through direct contact between cats. The most common methods of transmission include mutual grooming, sharing food or water dishes, and using the same litter box. Kittens can also contract the virus in utero or through infected milk from their mother. Less commonly, FeLV can be spread through bites or scratches.

Symptoms

Symptoms of FeLV infection can vary widely. In the early stages, cats may show no signs of illness. As the disease progresses, symptoms may include:

• Loss of appetite
• Weight loss
• Poor coat condition
• Enlarged lymph nodes
• Fever
• Pale gums
• Infections of the skin, urinary tract, and upper respiratory tract
• Persistent diarrhea
• Seizures, behavior changes, and other neurological disorders

Diagnosis

Diagnosis of FeLV is typically made through blood tests, which can identify the presence of the virus or antibodies against it. The most common tests include:

• ELISA (enzyme-linked immunosorbent assay) - can detect the virus in the blood, saliva, and tears.
• IFA (indirect fluorescent antibody) - confirms the presence of the virus in white blood cells, indicating a persistent infection.

Treatment

There is no cure for FeLV, but the disease can be managed with supportive care and treatment of secondary infections. Treatment options may include:

• Antiviral drugs
• Immune-enhancing drugs
• Blood transfusions for cats with severe anemia
• Antibiotics for secondary infections

Preventive measures are crucial in controlling the spread of FeLV. These include:

• Vaccination against FeLV
• Keeping infected cats indoors to prevent the spread to other cats
• Regular veterinary check-ups

Prognosis

The prognosis for cats with FeLV depends on several factors, including the stage of the disease and the presence of secondary infections. Some cats can live with the virus for many years with a good quality of life, while others may succumb to the disease or related complications.

Prevention

Prevention of FeLV is focused on minimizing exposure to the virus. Recommendations include:

• Vaccinating cats against FeLV, especially those at high risk
• Testing cats for FeLV before introducing them to a household with other cats
• Keeping cats indoors to avoid contact with infected cats

• 
  Diagram showing the outcomes of infection with Feline Leukemia Virus (FeLV)