Immunogenicity and Safety of Kinrix + (Measles Mumps Rubella) MMR Vaccine With and Without Varicella Vaccine in Healthy Children 4-6 Years

Inclusion Criteria: * Subjects for whom the investigator believes that their parents/ guardians can and will comply with the requirements of the protocol. * A male or female child between 4 and 6 years of age, inclusive. * Written informed consent obtained from the parent or guardian of the subject. * Healthy subjects as established by medical history and clinical examination before entering into the study. * Having received 4 doses of (Diphtheria, Tetanus Acellular Pertussis) DTaP vaccine using Pediarix and/or Infanrix, and 3 doses of poliovirus vaccine using Pediarix and/or (inactivated poliovirus vaccine, Aventis Pasteur) IPOL in the first 2 years of life. * Previously received 1 dose of M-M-RII and Varivax (separate or combined) in the second year of life. Exclusion Criteria: * Use of any investigational or non-registered drug or vaccine other than the study vaccines within 30 days preceding the administration of study vaccines, or planned use during the study period. * Concurrently participating in another clinical study, at any time during the study period, in which the subject has been or will be exposed to an investigational or non-investigational product or device. * History of previous or intercurrent diphtheria, tetanus, pertussis, polio, measles, mumps, rubella or varicella disease, or of vaccination against these diseases given after the second year of life. * Known exposure to diphtheria, tetanus, pertussis, or polio, prior to vaccination. * Poliovirus vaccin…