Immunogenicity and safety of concomitant inoculation of Measles and rubella combined live vaccine and Japanese encephalitis attenuated live vaccine

Objective: To evaluate the immunogenicity and safety of concomitant inoculation of Measles and Rubella Combined Live-attenuated Japanese encephalitis vaccine. Methods: Healthy children aged 8 months in selected cities in Zhejiang Province were randomly assigned to the MR and JVE-L combined vaccination group (the experimental group), and the MR single vaccination group (the control group) was taken before the exemption and 6 weeks after the exemption. Peripheral venous blood 1 ml was used as serum antibody test for measles and rubella, and the levels of measles and rubella antibodies before and after vaccination were evaluated. The safety of combined vaccination was evaluated. Measles and rubella IgG antibodies were detected by enzyme-linked immunosorbent assay (ELISA). Data were double-entry with Epidata and statistical analysis was performed using Epi Info epidemiological statistical analysis software. Results: The results showed that no severe adverse event occurred in two groups, clinical reactions in each inoculation group were mild.The seroconversion rate of measles antibody and rubella antibody were 96.43% and 88.49% in the experimental group after vaccination, the geometrical mean concentrations(GMC) of measles antibody was 1 526.45 mIU/ml and the GMC of rubella antibody was 47.70 mIU/ml after concomitant inoculation; the seroconversion rate of measles antibody and rubella antibody were 97.62% and 86.11% in the control group, the GMC of Measles antibody was 1 392.28 mIU/ml and the GMC of Rubella antibody was 45.72 mIU/ml after MV inoculation. No difference were detected in two groups of seroconversion rate of measles antibody and rubella antibody and GMC after vaccination. Conclusion: The immunogenicity and safety is equivalent when MR and JVE-L were simultaneous inoculation.