Isolation of a T-lymphotropic virus from domestic cats with an immunodeficiency-like syndrome

This landmark study isolated a novel lentivirus from a California cattery where cats showed chronic, AIDS-like immunodeficiency with opportunistic infections and wasting. The team recovered a T-lymphotropic, reverse-transcriptase-positive retrovirus from peripheral blood lymphocytes, distinct from feline leukemia virus, and reproduced disease experimentally. Now called feline immunodeficiency virus (FIV), it became the first non-primate lentivirus recognized as a naturally occurring analog of HIV. The discovery opened decades of comparative immunology, gave researchers a tractable animal model for lentiviral pathogenesis and vaccine development, and reshaped feline clinical practice around testing, isolation, and supportive care. It matters because it linked feline medicine directly to the global AIDS research effort.