FIG. 2.

PBMC were incubated with HSV-1, washed, and incubated at 37°C in 5% CO₂ as described for Fig. 1A. NK activity against ⁵¹Cr-labeled K562 targets was determined at different time points postincubation. Note the peak increase in NK activity in HSV-treated PBMC at 24 h after the treatment.