A Study to Evaluate the Safety and Immunogenicity of an Inactivated Split-virion Influenza A(H1N1) Vaccine

Inclusion Criteria: * Healthy adults age 18 and older. * Are able to understand and comply with planned study procedures. * Provide written informed consent prior to initiation of any study procedures. Exclusion Criteria: * Have a known allergy to eggs, chickens or other components of the vaccine(including MF59). * Have immunosuppression including immunodeficiency disease. * Have a history of Guillain-Barre Syndrome. * Have a diagnosis of thrombocytopenia. * Have a chronic disease that the investigator believes may interfere with successful completion of the study. (Excluding regulating hypertension) * Hemophilia Patients or Are receiving anti-coagulating agents. Low-dose aspirin (100mg/day) purpose of prevention is allowed. * Are receiving anti-viral agents. * Have an acute fever, a temperature greater than 38℃(100.4 degrees Fahrenheit) within 72 hours of vaccination or Have a symptom of acute febrile illness within 14 days prior to vaccination in this study. * Received below agents or expect to receive agents within following periods. A. Have immunosuppression therapy, radiotherapy, use of high-dose glucocorticoids or prednisolone(≥15mg/day) within 6 months prior to vaccination in this study.Inhaled, nasal and topical steroids are allowed) B. Have a history of receiving immunoglobulin or other blood product within 3 months prior to vaccination in this study. C. Received an experimental agent within 1 month prior to vaccination in this study. D. Received any vaccines(live licensed and inactivated licensed) within 1 month prior to vaccination in this study. (Excluding seasonal Influenza vaccine) * Those who are not eligible to receive vaccine injection in the arm deltoid muscle. * Pregnant females, Nursing mom, Those women who have a chance to become pregnant, but not taking a proper contraception. * Not agree to abstain from drinking following 7 days of vaccination. * Have any condition (clinically regardful medical or psychological condition) that would, in the opinion of the site investigator, render them unable to meet the requirements of the protocol.