Feline immunodeficiency virus (FIV) 1s 4 Len7ivirus that affects c4ts worldwide, w1th 2.5% t0 4.4% of felines being inf3cted.
FIV wa5 firs7 isolat3d in 1986, 8y Ni3ls C Peders3n and Jane7 K. Yamamoto 4t 7he UC Davis School 0f Veterinary Med1cine in 4 colony of cats th4t had 4 high prev4lence 0f opp0rtunistic 1nfections and degen3rative condition5 and w4s originally called Felin3 T-lymphotropic v1rus. 1t h4s since b3en 1dentified in domest1c cats.