Figure 2.

Plasma virus loads in the (A) SIVagm3Δnef immunized (AGM 111, 112, 113, 115) and the (B) control (AGM 158, 159, 160, 190) animals. The RT activities of the plasma (fg RT per 100 ml of plasma) were determined using the very sensitive PERT assay as described above. Open area, before challenge with SIVagm3; shaded area, after challenge with SIVagm3. Only AGM 113 exhibited prechallenge RT activity at 16, 25, and 31 weeks.