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J Infect Dis. 2014 Oct 1;210(7):1073-82. doi: 10.1093/infdis/jiu113. Epub 2014 Mar 12.

A booster dose of an inactivated enterovirus 71 vaccine in chinese young children: a randomized, double-blind, placebo-controlled clinical trial.

Author information

1
School of Public Health, Southeast University.
2
Jiangsu Provincial Center for Disease Control and Prevention, Nanjing College of Pharmacy, Third Military Medical University National Engineering Research Center for Immunological Products, Chongqing.
3
National Institute for Food and Drug Control.
4
Beijing Vigoo Biological, China.
5
Jiangsu Provincial Center for Disease Control and Prevention, Nanjing.

Abstract

BACKGROUND:

A significant waning of enterovirus 71 (EV71) antibody titer after priming immunization with an inactivated EV71 vaccine implied the potential need for a booster dose.

METHODS:

In this randomized, double-blind, placebo-controlled clinical trial, we recruited participants who had received at least 1 dose of priming EV71 vaccine in an early phase 2 clinical trial that was conducted in healthy infants and children aged 6-35 months. All participants were grouped according to the priming EV71 vaccine formulations (160 U, 320 U, and 640 U with adjuvant and 640 U without adjuvant) and then randomly assigned (ratio, 2:1) to receive a booster dose of vaccine or placebo within each formulation group. The primary end point was the geometric mean titer 28 days after the booster dose.

RESULTS:

A total of 773 participants were enrolled. Significantly greater immunological responses were induced by the booster shot of all 4 formulations of EV71 vaccine, compared with that induced by placebo (P < .0001). The frequencies of adverse reactions were similar between vaccine and placebo groups within each formulation group.

CONCLUSIONS:

A booster dose of EV71 vaccine 1 year after the priming EV71 immunization shows excellent immunogenicity and good safety profile. Clinical Trials Registration: NCT01734408.

KEYWORDS:

booster immunization; enterovirus 71 vaccine; immunogenicity and safety

PMID:
24625805
DOI:
10.1093/infdis/jiu113
[Indexed for MEDLINE]

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