Immunogenicity & Safety of Hepatitis A Vaccine Co-admin With a Measles/Mumps/Rubella & a Varicella Vaccine in Children

An open, controlled comparison of Havrix™ administered alone or with MMR II and Varivax™. The three groups evaluated are: 1) Havrix™ alone, 2) Havrix™ + MMR II and Varivax™ and 3) MMR II and Varivax™ followed by Havrix™ one month later.