Specific infectivity of FMDV populations C-S8p260 and C-S8p260p3d.

aTotal viral RNA was measured in the supernatant of infected BHK-21 cells, when complete cytopathic effect was reached. Each value represents the mean and standard deviation of three independent determinations.bThese values were determined by quantitative electronic microscopy of purified viral stocks. Each value represents the mean and standard deviation of ten independent determinations.a,bThese values were reported in [1].cMean and standard deviation of 5 independent determinations.dRatio between viral genomic RNA molecules and viral titer.eRatio between values in the two first rows.fIn brackets, the average of seven additional determinations of the ratio between C-S8p260 RNA and C-S8p260p3d RNA is given.gThe inverse of 0.38 is given in brackets.