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

Inclusion Criteria: * Subjects whose parents/guardians are believed by the investigator to be willing to comply with the requirements of the protocol * A male or female child 12 and 13 months of age at the time of entry into the Enrollment Phase * Written informed consent obtained from the parents or guardian of the subject, * Free of obvious health problems as established by medical history and history-directed physical examination before entering into the study, and * Parents/guardian of the subject must have a telephone or be able to be contacted by telephone Exclusion Criteria: * Use of any investigational or non-registered drug or vaccine other than the study vaccine(s) within 42 days preceding the first dose of study vaccine, or planned use during the study period, Chronic administration (defined as more than 14 days) of immuno-suppressant or other immune-modifying drugs within six months prior to vaccination or planned administration at any time during the study period. (For corticosteroids, this will mean prednisone, or equivalent, ≥0.5 mg/kg/day. Inhaled, nasal and topical steroids are allowed.) Planned administration or administration of any vaccine not foreseen by the study protocol during the period 31 days before and 31 days after each dose of study vaccine(s). * Previous vaccination against hepatitis A, * History of hepatitis A, * Known exposure to hepatitis A, * Previous vaccination against measles, mumps, rubella and/or varicella, * History of measles, mump…