Study to Evaluate the Immunogenicity and Safety of 'IL-YANG Quadrivalent Influenza Vaccine Inj.'

In this study, only eligible subjects for the study based on the inclusion/exclusion criteria will be randomized to the following stratification groups by age to receive one dose of the test vaccine, comparator 1, or comparator 2. * Group A: healthy adults at the age of ≥ 19 and \< 65. * Group B: healthy adults at the age of ≥ 65. During the study participation, the investigator will assess immunogenicity and safety in subjects. The investigator will perform immunogenicity tests at Visits 1 and 3 (end of study visit) for immunogenicity evaluation (prior to the investigational product vaccination) and instruct subjects to record AEs occurring after the investigational product vaccination for safety assessment. A blood sample will be collected from a subject who is assigned a subject number. Following an intramuscular injection of 0.5mL investigational product in the deltoid muscle of the shoulder, the subject will have a study visit on Week 4 for blood sampling for antibody titer testing. In addition, a telephone visit will be performed to assess serious AEs (SAEs) up to Day 180 after vaccination.