A comparative analysis of immunogenicity and safety of an enterovirus 71 vaccine between children aged 3-5 years and infants aged 6-35 months

Gu, W.; Zeng, G.; Hu, Y-Mei.; Hu, Y-Sheng.; Zhang, Y.; Hu, Y-Ling.; Wang, Y.; Li, J-Xin.; Zhu, F-Cai.

Expert Review of Vaccines 17(3): 257-262


ISSN/ISBN: 1476-0584
PMID: 29363365
DOI: 10.1080/14760584.2018.1430572
Accession: 044048475

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The Sinovac enterovirus 71 (EV71) vaccine has shown good safety, immunogenicity, and efficacy in infants aged 6-35 months, whom are considered as the priority of the target population. However, 3-5 years old children accounted for approximately 30% of HFMD cases and are also worth our attention. A randomized, double-blind, placebo-controlled, batch-to-batch consistency clinical trial enrolling 1400 participants aged 6-59 months was performed. We pooled the participants receiving three batches of EV71 vaccine together and then stratified them into the 6-35 months and 3-5 years. The non-inferiority analysis of the geometric mean titer (GMT) of EV71 neutralizing antibody post-vaccination was the primary endpoint. In the vaccine group, the GMT of 242 children aged 3-5 years was 132.72 (95% CI, 110.3-159.6), which was non-inferior to that generated in 717 infants aged 6-35 months. Following the vaccination, the incidence of adverse reactions was less frequent in children aged 3-5 years (47.0%) than that found in infants aged 6-35 months (60.1%) (p = 0.0026). Our study indicated that the EV71 vaccine was also safe in children aged 3-5 years, with non-inferior immunogenicity to that in infants aged 6-35 months.