FIG. 5.

Interferon attenuates PMA-mediated reactivation of latent FV. At 72 h posttransfection of FV-infected Jurkat cells, titers were determined in triplicate on FAB cells. Column 1, untreated FV-infected Jurkat cells; column 2, cells treated with 50 ng of PMA per ml; column 3, cells treated with 1,000 U of IFN-α per ml; column 4, cells treated simultaneously with 50 ng of PMA per ml and 1,000 U of IFN-α per ml; column 5, cells treated with 1,000 U of IFN-α per ml for 12 h, after which 50 ng of PMA per ml was added.