Study of a Novel Tetravalent Dengue Vaccine in Healthy Children Aged 2 to 14 Years in Asia

The aim of the trial was to assess the efficacy of the CYD dengue vaccine in preventing symptomatic, virologically-confirmed dengue (VCD) cases. Primary Objective: To assess the efficacy of CYD dengue vaccine after 3 vaccinations at 0, 6, and 12 months in preventing symptomatic VCD cases, regardless of the severity, due to any of the four serotypes in children aged 2 to 14 years at the time of inclusion. Secondary Objectives: * To describe the efficacy of CYD dengue vaccine in preventing symptomatic VCD cases after the third dose to the end of the Active Phase, after at least 1 dose, and after 2 doses. * To describe the occurrence of serious adverse events (SAEs), including SAEs of special interest in all participants throughout the trial period. * To describe the occurrence of hospitalized virologically-confirmed dengue (VCD) cases and the occurrence of severe (clinically-severe or as per World Health Organization (WHO) criteria) VCD cases, throughout the Surveillance Expansion period (SEP) and throughout the trial (from Day 0 to the end of the study). * To describe the antibody response to each dengue serotype after Dose 2, after Dose 3, and 1 and 5 years after Dose 3.