Immune Persistence After Inoculated With One-dose Freeze-Dried Live Attenuated Varicella Vaccine in Children Vaccine in Children

Inclusion Criteria: * Participant are healthy children aged 1-6 years, who has inquired for medical history and physical examination, and met the requirement of the vaccine trial * Parent/legal acceptable representative is willing and able to understand the protocol requirements and provide informed consent * Subject and parent/guardian able to attend all scheduled visits and comply with all trial procedures * Body temperature ≤37℃ Exclusion Criteria: * Participant with previous history of chickenpox or zoster * Receipt of varicella vaccine * Reported the family history of allergies, convulsions, epilepsy and mental illness * Known allergy to any constituent of the vaccine * Known serve illness, in a fever, acute infection and chronic disease activity * Receipt of steroid * Reported the history of thrombocytopenia or other coagulation disorders, which may cause * Known or suspected impairment of immunologic function, or receipt of immunosuppressive therapy or immunoglobulin since birth * Known congenital malformation, developmental disorders and severe chronic disease (e.g. Down's syndrome, diabetes, sickle cell anemia and neurologic disorders) * Known dermatopathy with allergy, herpes, fester, and fungal infection * Receipt of whole blood, blood plasma or immunoglobulin in the 3 months preceding the trial vaccination * Reported the history of acute illness had need systemic antibiotics or anti-viral treatment of infections in the 7 days preceding the trial vaccination * Participant with fever(temperature≥ 38℃) in the days * Any condition, which, in the opinion of the investigator, would pose a health risk to the subject