FIG. 5.

Single-step growth curves of CEF94, rCEF94, and srIBDV-CADB. QM5 cells were infected with IBDV (MOI = 5) for 1 h beginning at time zero, washed three times, and covered with fresh medium. At different time points samples were taken from the supernatant and the amount of IBDV (TCID₅₀ per milliliter) was determined. The TCID₅₀ at each time point is the mean of three independent experiments; error bars represent standard deviations.