Dynamic monitoring of anti-poliovirus neutralizing antibody and anti-hepatitis A virus IgG antibody in healthy children immunized with inactivated enterovirus 71 vaccine (human diploid cell)

Objective To investigate the dynamic changes of three types of anti-poliovirus neutralizing antibodies and anti-hepatitis A virus (HAV) IgG antibody in children who were immunized with inactivated enterovirus 71 (EV71) vaccine (human diploid cell). Methods Serum samples were collected from the subjects immunized with inactivated EV71 vaccine. Neutralizing antibodies against EV71 and poliovirus were detected by micro-cytopathic effect neutralization test. Enzyme linked immunosorbent assay (ELISA) was used to detect IgG antibody against HAV. Results The geometric mean titers (GMTs) of anti-EV71 neutralizing antibody increased to 4.85 following the first-dose injection of inactivated EV71 vaccine. A significant increase of GMTs (up to 64.37) could be observed 28 days after the second-dose vaccination. Meanwhile, results of the dynamic monitor showed that there were slight fluctuations in the neutralizing antibodies against three types of poliovirus on day 28 (28 days after the first-dose vaccination) compared with those on day 0 (before vaccination) (P 0.05). The level of anti-HAV IgG antibody was stable and no significant difference was found during the observation period (P>0.05). Conclusion This study shows that inactivated EV71 vaccine has no impact on anti-HAV IgG antibody in Children during the two-dose vaccination and in anti-EV71 antibody-producing period, but has slight influence on the anti-poliovirus antibodies. In general, changes in antibody profile do not affect the clinical efficacy of immune response. Key words: Inactivated enterovirus 71 vaccine (human diploid cell); Vaccinated children; Antibody; Dynamic monitor