Study on Immunogenicity and Safety of a Meningococcal ACYW Conjugate Vaccine in Healthy Infants and Toddlers

Inclusion Criteria: * Aged 6 to 7 months on the day of inclusion * Participants who are healthy as determined by medical evaluation including medical history, physical examination and judgment of the Investigator Exclusion Criteria: Participants are excluded from the study if any of the following criteria apply: * Known or suspected congenital or acquired immunodeficiency; 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 * History of meningococcal infection, confirmed either clinically, serologically, or microbiologically * At high risk for meningococcal infection during the study (specifically but not limited to participants with persistent complement deficiency, with anatomic or functional asplenia, or participants traveling to countries with high endemic or epidemic disease) * Personal history of Guillain-Barré syndrome * Personal history of an Arthus-like reaction after vaccination with a tetanus toxoid-containing vaccine * Known systemic hypersensitivity to any of the study intervention components, or history of a life-threatening reaction to the study intervention(s) used in the study or to a product containing any of the same substances * Moderate or severe acute illness/infection (according to investigator judgment) or febrile illness (temperature ≥ 38.0°C \[≥…