FeLV and FIV: transmission, testing and follow-up

Edited by MaxTeng · Educational content, not reviewed by a veterinarian · 2026-10-26

These are different feline viruses. Exposure, test targets and vaccination questions must be separated.

Different transmission patterns

FeLV can spread through prolonged close contact, grooming, bites or mother-to-kitten transmission. Bites are a major FIV route. Shared space and indoor status alone cannot establish infection risk or status.

Understand the test target

Common screens detect FeLV antigen and FIV antibody. Recent exposure, age, vaccination/test history and method can affect interpretation. Initial or discordant results may need confirmation or follow-up; bring the original report.

Separate vaccination questions

FeLV vaccination does not protect against FIV. Discuss FeLV age/exposure/product choices separately from FIV vaccine availability and suitability in the local jurisdiction. Vaccines do not replace tests or treat existing infection.

Plan follow-up individually

A screening result alone cannot determine prognosis or a household decision. Record exposure dates, contacts, test details, vaccine history, weight, intake and symptoms. Ask what needs confirmation and how to arrange contact and ongoing care.