FeLV at home: can a positive cat live with a negative kitten?
A family has an adult cat with progressive FeLV infection and wants to adopt a 3-month-old FeLV-negative kitten to keep him company.
What is the most appropriate advice?
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A. There is no risk, because FeLV is only transmitted through bite wounds in fights
That is the typical route for FIV. FeLV is mainly transmitted through friendly contact: saliva during mutual grooming and shared food and water bowls.
B. Vaccinating the kitten against FeLV gives complete protection, so they can live together without precautions
Vaccination greatly reduces the risk of progressive infection but does not give 100% protection, especially under close, continuous exposure.
C. Separate litter trays are enough, because transmission is faecal
Faeces play a minor role; the main route is saliva, so mutual grooming and shared bowls are the greatest risk.
D. Advise against cohabitation; if it happens, keep them physically separated and vaccinate the kitten against FeLV, knowing protection is incomplete
Correct. Kittens are the most susceptible to progressive infection, and resistance increases with age. The safest option is not to mix them; if unavoidable, physical separation and full vaccination.
lightbulb Key takeaway
Key difference: FeLV spreads through social contact (saliva) and mainly affects kittens; FIV spreads through deep bites, mainly among fighting entire males. Always test for FeLV before vaccinating and before introducing a new cat into a household.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.