FIG. 4.

Production of EV71-specific antibodies with neutralizing activity. The neutralizing antibody titers in the sera of mock-infected or EV71-infected C57BL/6 mice collected 7 days after infection were determined by neutralization assay. The highest dilution of serum that protected RD cell monolayers from infection was taken as the neutralizing titer. Each symbol on the scatter gram represents an individual sample, and the black horizontal line represents the mean value for the EV71-infected mice.