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Growth of vaccinia viruses in the cVero22 cell line compared to that of replicating viruses in normal Vero cells. Viruses with HA gene inserts (dVV-HA5, rVV-HA5, and rVV-L-HA-VN) and empty defective viruses (dVV-L and dVV-Y) reach similar endpoint titers. The Lister wt strain (VV-WT) grew to a higher titer. The titers are means of two determinations; error bars indicate the standard errors of the means.
