Long-Term Immunogenicity of Envacgen® in Children
brief summary
This study is designed to evaluate the long-term antibody titers of Envacgen® approximately 6 years after the first vaccination dose in participants who were aged 2 months to \<6 years at the time of enrollment in the CT-EV-31s study.
detailed description
This is an extension study of protocol CT-EV-31s, to evaluate the long-term immunogenicity of EV71 Enterovirus Vaccine (Envacgen®).
The study will consist of a single visit approximately 6 years after the first vaccination of the EV71 vaccine or Placebo in participants aged 2 months to \< 6 years when participating in the CT-EV-31s study. Immunogenicity response against EV71 virus antigen at the visit will be assessed.
official title
Extension Study of Protocol CT-EV-31s to Examine the Long-Term Immunogenicity After Receiving Inactivated EV71 Enterovirus Vaccine (Envacgen®) in Children