The primary risk factors for developing progressive infection include age and immune status, with younger or immunocompromised cats being more likely to develop progressive infection.
WebMD explains feline leukemia virus (FeLV), including symptoms, risk factors, treatments, and prevention.

Age: FeLV-related tumors tend to develop in younger cats, often under 5 years of age. Transmission: FeLV spreads through saliva, nasal secretions, and close contactmaking multi-cat environments particularly risky. Co-factors: Immunosuppression, co-infections (e.g., FIV), and genetic predisposition may worsen outcomes.

Suggested Articles Lymphoma Feline Vaccines: Benefits and Risks Diarrhea Neurological Disorders Feline Vision Problems: A Host of Possible Causes Feline leukemia virus (FeLV) is one of the most common and important infectious diseases in cats, affecting between 2-3% of all cats in the United States and Canada. Infection rates are significantly higher (up to 30%) in cats that are ill or ...

Feline leukemia virus (FeLV) is one of the most common infectious causes of disease of cats globally. Infection with FeLV can cause a variety of clinical signs, impacting a cat's longevity and quality of life. Vaccination and identification of infected cats is important in preventing disease transmission.