A Blind, Randomized and Controlled Study of Live Attenuated Varicella Vaccines

Inclusion Criteria:

• Healthy volunteer between 1 - 12 years old;

• Proven legal identity;

• Guardian(s) of the volunteer and/or volunteers themselves should be capable ofunderstanding the written consent form, and such form should be signed before thevolunteer being included into this study;

Exclusion Criteria:

• Prior vaccination with varicella vaccine or with history of varicella zoster virus (VZV) infection;

• Axillaty temperature > 37.0 °C;

• History of allergy to any vaccine or vaccine ingredient, or serious adversereaction(s) to vaccination, such as urticaria, difficulty in breathing, angioneuroticedema, abdominal pain, etc;

• History of epilepsy, seizures or convulsions, or a family history of mental illness,autoimmune disease or immunodeficiency;

• Severe malnutrition, congenital malformation, developmental disorders, or seriouschronic diseases;

• Acute disease or acute stage of chronic disease within 7 days prior to study entry;

• Receipt of any of the following products:

1. Any subunit vaccine or inactivated vaccine within 7 days prior to study entry;

2. Any live attenuated vaccine within 1 month prior to study entry;

3. Any blood product, immunosuppressant, hormone, or other investigationalmedicine(s) within 30 days prior to study entry;

• Any significant abnormity of heart, lung, skin, or pharynx;

• Any other factor that suggesting the volunteer is unsuitable for this study based onthe opinions of investigators;