Research overview: questions around feline immunodeficiency virus vaccination and wild cats

Vaccines against feline immunodeficiency virus exist for domestic cats but raise complex questions when considered for wild felids harboring their own endemic lentiviruses. This overview surveys the issues, including the limited evidence that FIV harms its natural wild hosts, the diversity of species-specific viral strains that a domestic-cat vaccine may not match, and the diagnostic confusion vaccination can create by inducing antibodies indistinguishable from infection. It examines whether intervention against FIV is warranted in wildlife and how it compares to the clearer cases for distemper or leukemia vaccination. The synthesis connects vaccinology to the nuanced epidemiology of endemic felid lentiviruses. It aims to help readers understand why FIV vaccination, straightforward in concept, is fraught with uncertainty for wild cats whose relationship with their lentiviruses differs from that of domestic cats.