TABLE 3.

Phylogenetic taxonomy of avian retroviruses based on gag gene sequences (see Fig. 2)^a

Category	Taxon name
Family	Retroviridae
Genus	Alpharetrovirus or ASLVs
Subgenus 1	Gallus ASLV (includes taxa in Fig. 2 clade I)
	Perdix ASLV (includes taxa in Fig. 2 clade II)
	Phasianidae/Odontophoridae ASLV (includes taxa in Fig. 2 clade VI)
Subgenus 2	Colinus ASLVs (includes taxa in Fig. 2 clade III)
	Tetraonine ASLVs (includes taxa in Fig. 2 clade IV)
	Bonasa/Phasianus ASLVs (includes taxa in Fig. 2 clade V)

^aThe taxon names Retroviridae and ‘Alpharetrovirus’ follow the ICTV convention. The term ASLV follows the usage of Payne et al. (24). Alpharetroviruses have also been known as avian type C retroviruses. We suggest that the genus ASLV includes other avian retroviruses, including lymphoproliferative disease virus, EAV-E51, ev/J, and ART-CH, based on limited sequence comparisons.