TABLE 1.

Infection and receptor binding properties of three receptor classes of PERV

PERV envelope class	Ability to bind receptor or infect the following cellsa:						References
	ST-Iowa (pig)		293 (human)		SIRC/PAR (rabbit)b
	Bindc	Infect	Bind	Infect	Bind	Infect
PERV-A	+	+	+	+	+	+	10, 13, 46, 50
PERV-B	ND	+	+	+	−	−	10, 46, 50
PERV-C	+	+	+	−	−	−	10, 13, 46

^a+, binds or infects; −, does not bind or does not infect.

^bRabbit cells (SIRC) expressing either one of the human PERV-A receptor cDNAs, HuPAR-1 or HuPAR-2 (10).

^cAs determined by binding of SU-IgG (13, 50). ND, not done.