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Groups of BALB/c mice (n = 10) were immunized with purified inactivated EV71 with Alhydrogel, or Alhydrogel control. Symbols represent mean of reciprocal neutralizing antibody titers from groups of 10 animals ± standard deviation. Y-axis is plotted on a logarithmic scale. Dotted line shows titer of 128 (7 log2).
