Growth of RUB in human cell lines. Cultures of Hs888Lu, HEF, Hs143we, and Vero cells were infected with RUB (MOI = 10 PFU/cell) and titer of virus present in the culture medium was determined by plaque assay at 1, 3, 5, and 7 dpi (A) and the percentage of apoptotic cell was determined at 5 dpi (B). The data presented in Panel A are representative of 2 independent repetitions and the data presented in Panel B are the average of 3 independent repetitions.