FIG. 2.

Growth properties of wt and D188A mutant SFV. BHK cells were infected with wt or D188A SFV at an MOI of 0.05 for 1 h at 37°C. The cells were washed and incubated for the indicated times at 37°C, and the progeny virus in the medium was quantitated by plaque assay. D188A-1 and -2 represent two independent clones of the mutant virus.