Influenza vaccine (inactivated, split virion), Changchun Institute of Biological Products(Changchun Institute of Biological Products)

The primary objective is to evaluate the effect of simultaneous administration of EV71 inactivated vaccine and trivalent influenza split vaccine on antibody seroconversion rate; the secondary objective is to evaluate the effect of simultaneous administration of EV71 inactivated vaccine and trivalent influenza split vaccine on antibody level; and to evaluate the safety of simultaneous administration of EV71 inactivated vaccine and trivalent influenza split vaccine.