What it is and how it spreads
Feline leukaemia is an infection caused by feline leukaemia virus (FeLV). It can affect the immune system, cause anaemia and contribute to certain cancers. Close contact between cats, especially through saliva and mutual grooming, can spread the virus; an infected mother can also pass it to her kittens. A cat may appear healthy during part of the infection.
Why testing and prevention matter
Test results need to be interpreted in light of a cat’s history and timing of exposure; some situations call for follow-up testing. FeLV vaccination helps prevent infection, but it does not cure a cat that is already infected and does not provide absolute protection. Limiting contact with cats whose status is unknown remains important.
The FeLV vaccine is not the feline combination vaccine. Whether and when to give it is assessed based on age, exposure and medical history, together with any testing the veterinarian recommends.
Prepare for a conversation about your cat
When requesting an appointment, gather previous test results and their dates, and mention whether a new cat has joined the household. Make clear which document belongs to each animal: a photo of a result without a name can cause confusion. Also explain whether you want to review preventive care or discuss a current health concern.
Make a short list of questions: what the available result means, whether any history is missing and what the next step may be. Do not assume that a record marked “triple” confirms protection against FeLV; ask which product was recorded.
When to seek care
Marked lethargy, weight loss or pale gums warrant veterinary assessment. For breathing difficulty or marked deterioration, seek immediate care at a veterinary centre. Reinavet sees patients by appointment; WhatsApp is for arranging consultations, not emergency response.
Continue your preventive plan
Review the FeLV vaccination service and vaccination options for cats. You can ask about availability and share the reason for the visit and the records you have.
Source
Cornell Feline Health Center: Feline Leukemia Virus. Accessed 20 October 2026. Educational information; it does not replace an assessment of your cat.