The Viruses
   The DNA and RNA Reverse Transcribing Viruses
     Family Retroviridae
       Subfamily Orthoretrovirinae
         Genus Lentivirus
           1 Bovine immunodeficiency virus
           2 Caprine arthritis encephalitis virus
           3 Equine infectious anemia virus
           4 Feline immunodeficiency virus
           5 Human immunodeficiency virus 1ᵀ
           6 Human immunodeficiency virus 2
           7 Puma lentivirus
           8 Simian immunodeficiency virus
           9 Visna/maedi virus