Super-Sized flu shot for tots? study tests higher dose

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion criteria : * Aged 6 to 35 months on the day of the first study visit * Informed consent form was signed and dated by the parent(s) or guardian(s) and by an independent witness, if required by local regulations. * Participant and parent / guardian who were able to attend all scheduled visits and to comply with all study procedures. * Covered by health insurance if required by local regulations * For Season 3 Re-vaccination Cohort: eligible participants must have been enrolled in the Season 1 (2021-2022 Northern Hemisphere season) immunogenicity subset and must have completed all study procedures (ie, blood draws and vaccinations) in Season 1. Exclusion criteria: * Participation at the time of study enrollment (or in the 4 weeks preceding the first study vaccination) or planned participation during the present study period in another clinical study investigating a vaccine, drug, medical device, or medical procedure. * For all participants: Receipt of any vaccine in the 30 days preceding the first study vaccination. For participants in immunogenicity subset: Planned receipt of any vaccine before Visit 2 for participants receiving 1 dose of influenza vaccine or Visit 3 for participants receiving 2 doses of influenza vaccine. * Previous vaccination against influenza in the preceding 6 months with either the study vaccine or another influenza vaccine * Receipt of immune globulins, blood or blood-derived products in the past 3 months. * Known or suspected congenital or acquired immunodeficiency (eg, HIV); or receipt of immunosuppressive therapy, such as anti-cancer chemotherapy or radiation therapy, within the preceding 6 months; or long-term systemic corticosteroid therapy (prednisone or equivalent for more than 2 consecutive weeks within the past 3 months). * Known systemic hypersensitivity to any of the vaccine components, or history of a life-threatening reaction to the vaccines used in the study or to a vaccine containing any of the same substances. Exception: participants with an egg allergy are allowed to enroll in the study. * Thrombocytopenia, bleeding disorder, or receipt of anticoagulants that based on Investigator's judgment contraindicate intramuscular vaccination * Chronic illness that, in the opinion of the investigator, was at a stage where it might interfere with study conduct or completion. * Moderate or severe acute illness/infection (according to investigator judgment) on the day of vaccination or febrile illness (temperature ≥ 38.0 C \[≥ 100.4 F\]). A prospective participant would not be included in the study until the condition was resolved or the febrile event was subsided. * Identified as natural or adopted child of the Investigator or employee with direct involvement in the proposed study. * Personal or family history of Guillain-Barre Syndrome. * Any condition that in the opinion of the Investigator would pose a health risk to the participant if enrolled or could interfere with the evaluation of the vaccine. * Personal history of clinically significant development delay (at the discretion of the Investigator), neurologic disorder, or seizure disorder. * For Season 3 (2022-2023 Northern Hemisphere) main cohort: participants who were enrolled in a previous study season are excluded from Season 3, with the exception of the Re-vaccination Cohort. The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.