HS-27a cells were exposed at day 0 to GFP-CMV at 0.2 MOI and then incubated in control media (□), 2 ng/mL IL-1β (○), or 2 ng/mL IFN-γ (▵). At day 17, cell cultures were passaged into fresh medium (solid symbols). The amount of GFP-CMV as measured by fluorescence intensity was determined on the days indicated using a CytoFluor plate reader, as described.