Study Status: Active, not recruiting
Recruit Status: Active, not recruiting
Study Type: Interventional
Official Title: A Study of Immune Persistence After Inoculated With One-dose Freeze-dried Live Attenuated Varicella Vaccine in Children Aged 1-6 Years
Brief Summary: The purpose of this study is to observe the persistence of protection, duration of protection, safety and breakthrough infection rates afforded by live attenuated varicella vaccine in children over a 5-year period.