In addition, we invited the 4002 children between the ages of 4 and 11 years from a single-center phase 2b trial (CYD23) in Thailand that had a study design similar to that of the CYD14 and CYD15 trials to participate in a separate study (CYD57) of 4 years of follow-up in which we are assessing safety in a similar way to the way it is being assessed in the two phase 3 trials.4 Here we report the interim analyses of data from the long-term safety phase and integrated analyses of data from the efficacy surveillance phase to provide a global view of the clinical profile of the CYD-TDV dengue vaccine.