TABLE 3.

Classification of retroviruses

Subfamily and genusaPrevious nomenclatureSpecies infectedExample(s)
Orthoretrovirinae
    AlpharetrovirusAvian C-type oncoretrovirusBirdsAvian leukosis viruses, Rous sarcoma virus
    BetaretrovirusB-type oncoretrovirusMiceMMTV
D-type oncoretrovirusPrimatesMPMV
SheepJSRV
    GammaretrovirusMammalian C-type oncoretrovirusMiceMLVs
CatsFeline leukemia viruses
PrimatesGibbon ape leukemia virus
BirdsReticuloendotheliosis virus
    DeltaretrovirusC-type oncoretrovirusCattleBovine leukemia virus
PrimatesHuman T-lymphotropic viruses
    EpsilonretrovirusNoneFishWalleye dermal sarcoma virus
    LentivirusLentivirusPrimatesHIV and SIV
SheepMaedi/visna virus
CatsFeline leukemia virus
HorsesEquine infectious anemia virus
Spumaretrovirinae
    SpumavirusFoamy virusPrimatesHFV and SFV
CatsFeline foamy virus
CattleBovine foamy virus
  • a Refers to exogenous retroviruses only (286), but note that ERVs related to extant alpharetroviruses, betaretroviruses, gammaretroviruses, and spumaretroviruses are present in many vertebrate species.