FIG. 3.

Growth of MCMV mutants in cultured NIH 3T3 cells. NIH 3T3 cells were infected with each virus at a MOI of either 0.5 PFU (A) or 5 PFU per cell (B). At 0, 1, 2, 4, and 7 days postinfection, we harvested cells and culture media and determined the viral titers by plaque assays on NIH 3T3 cells. The error bars indicate the standard deviations. The values of the viral titer represent the average obtained from triplicate experiments.