- *Participants must have received the total number of doses expected for each vaccine recommended for his/her age in the respective NIPs, but inclusion of participants with variations in the vaccine administration timeframes is considered acceptable if the total number of doses for the corresponding vaccines have been completed (e.g., in Mexico, 3 infant doses of the pentavalent vaccine must have been administered but the 4th dose due in the 2nd year of life should not have been administered for participants to be included in the trial). For the Russian Federation only, participants that have not received a seasonal flu vaccination from 6 months of age according to the Russian NIP are still eligible to participate in this study.