The characteristics of EV71-infected RD cell proliferation in different time points. Control: Uninfected RD cells. Mock: Inactivated EV71-infected RD cells. EV71: EV71-infected RD cells. Viable cell count was assessed by trypan blue exclusion technique. The data were expressed as mean ± SE from 3 independent experiments. * P < 0.05 and **P < 0.01 by two-way ANOVA.