An observer-blind study to evaluate GlaxoSmithKline Biologicals' live attenuated varicella vaccine and GlaxoSmithKline Biologicals' combined measles-mumps-rubella-varicella vaccine in the prevention of varicella disease in children. The Protocol Posting has been updated in order to comply with the FDA Amendment Act, Sep 2007.
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Phase A: Number of Subjects With Confirmed Varicella Case
Timeframe: From 42 days post dose 2 until the end of Phase A