Phase 3 Study to Evaluate the Immunogenicity and Safety of Inactivated Split Influenza Vaccine in Healthy Korea Adults

Inclusion Criteria: * Healthy man and woman 18 years of age or older * Woman of childbearing potential must have a negative urine human chorionic gonadotropin (HCG) test at screening * Subject who was given, and fully understood, the information about the study, made a voluntary decision, and provided written informed consent, to participate in the study and comply with all applicable study requirements. Exclusion Criteria: * Subject with a known allergy to eggs, chicken, neomycin, gentamicin or any components of the study vaccine * Subject who had received an influenza vaccine within the last 6 months * Subject who has, or has a family history of, an immune system disorder including immune deficiency disease * Subject who had participated in blood donation within 1 week prior to vaccination, or is planning to participate in blood donation from Day 1 until Month 7 post-vaccination. * Subject with a history of Guillain-Barre syndrome * Subject with Down's syndrome or cytogenetic disorders. * Subject with severe chronic disease which in the investigator's opinion would not make the subject a good candidate for the clinical trial * Subject with hemophilia or being treated with an anticoagulant, who are at increased risk of serious bleeding during intramuscular injection * Subject who had an acute fever with body temperature \> 38.0 Cº within 72 hours prior to administration of the study vaccine * Subject who had received any product containing acetylsalicylic acid or aspirin within 14 days prior to administration of the study vaccine * Subject who had previously received another vaccine within 28 days before administration of the study drug, or is scheduled to receive another vaccine during the study period. * Subject who had received immunosuppressant or immune modifying drug within the last 3 months prior to administration of the study vaccine * Subject who had previously received immunoglobulin or blood-derived products within the last 3 months prior to administration of the study vaccine, or is expecting to be treated with immunoglobulin or blood-derived products during the study. * Subject who had participated in another experimental study within 30 days prior to administration of the study vaccine * Woman of childbearing potential at screening or woman who plans to become pregnant during the study. A woman of childbearing potential must have a negative pregnancy test, and, unless surgically sterile, must use an effective method of contraception throughout the study to be eligible for the study. Periodic abstinence and withdrawal are not considered as acceptable methods of contraception. Use of hormonal contraceptives is not allowed. * Subject with other clinically significant medical or psychological condition who in the investigator's opinion would not be suitable for the study.