Annual Study for Collection of Serum Samples in Children and Older Adults Receiving the 2021-2022 Formulations of Fluzone Quadrivalent Vaccine and Fluzone High-Dose Quadrivalent Vaccine, Respectively

Inclusion Criteria: * Aged 6 months to \< 9 years or \>= 65 years of age on the day of first study vaccination (study product administration). * For infants and toddlers, born at full term of pregnancy (\>=37 weeks) or born after a gestation period of 27 through 36 weeks. * For participants 6 to \< 12 months of age, born at full term of pregnancy (\>= 37 weeks) and with a birth weight \>= 5.5 pound (lbs) (2.5 kilogram \[kg\]). * Informed consent form (ICF) has been signed and dated by participants \>= 65 years of age. * Assent form has been signed and dated by participants 7 to \< 9 years of age, and ICF has been signed and dated by parent(s) or another legally acceptable representative for participants 6 months to \< 9 years of age. * Participants or participant and parent/legally acceptable representative (of participants 6 months to \< 9 years of age) were able to attend all scheduled visits and complied with all study procedures. 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 3 months preceding planned inclusion). * Known systemic hypersensitivity to any of the study intervention components, or history of a life-th…