ERVW-1 and infection: In contrast, neither virological readout provided evidence for a spreading infection in hCD4/hCCR5-tg rat T-cells (Fig. 9A, B, left panels; and data not shown) indicating that the infection phenotype observed for HIV-1R7/3 YU-2 Env GFP is not a universal property of replication-competent HIV-1 GFP reporter viruses.