A Study to Investigate the Safety and Immunogenicity of the Quadrivalent Influenza mRNA Vaccines in Adults Aged 18 Years and Above

Inclusion Criteria: * Aged from 18 years on the day of inclusion or aged from 21 years on the days of inclusion, depending on the countries. * A female participant was eligible to participate if she was not pregnant or breastfeeding and one of the following conditions applied: * Was of non-childbearing potential. To be considered of non-childbearing potential, a female must of been postmenopausal for at least 1 year, or surgically sterile OR * Was of childbearing potential and agreed to use an effective contraceptive method or abstinence from at least 4 weeks prior to study intervention administration until at least 12 weeks after study intervention administration. * A female participant of childbearing potential must of had a negative highly sensitive pregnancy test (urine or serum as required by local regulation) within 8 hours before the 1st dose of study intervention Exclusion Criteria: Participants were excluded from the study if any of the following criteria applied: * 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) * Known systemic hypersensitivity to any of the study intervention components (eg, polyethylene glycol, polysorbate); history of a life-threatening reaction to the study interventions …