Viral replication kinetics. Comparison of the viral replication characteristics of YEbac102 (•),YEbacΔUL20 (▪),YEbacΔgK (▴),YEbacΔgB (○),YEbacΔgBΔUL20 (□), and YEbacΔgBΔgK (▵) on Vero cells. One-step kinetics of infectious virus production were calculated after infection at an MOI of 5 followed by incubation at 37°C.