Study to Evaluate the Safety and Immune Response of Two-Doses of Candidate Influenza Vaccine GSK 1557484A in Adults

Inclusion Criteria:

• Male and female adults 18 to 64 years of age at time of first vaccination, inclusive.
• Good general health as assessed by medical history and physical examination.
• Access to a consistent means of telephone contact
• Written informed consent obtained from the subject.
• Comprehension of the study requirements, expressed availability for the required study period, and ability to attend scheduled visits.
• Subjects who the investigator believes that they can and will comply with the requirements of the protocol should be enrolled in the study.

Exclusion Criteria:

• Presence of significant acute or chronic, uncontrolled medical or psychiatric illness
• Presence of evidence of substance abuse or of neurological or psychiatric diagnoses which, although stable, are deemed by the investigator to render the potential subject unable/unlikely to provide accurate safety reports.
• Blood pressure abnormalities
• Diagnosed with cancer, or treatment for cancer, within 3 years.
• Persons with a history of cancer who are disease-free without treatment for 3 years or more are eligible.
• Persons with a history of histologically-confirmed basal cell carcinoma of the skin successfully treated with local excision only are excepted and may enroll, but other histologic types of skin cancer are exclusionary.
• Women who are disease-free 3 years or more after treatment for breast cancer and receiving long-term prophylactic tamoxifen are excepted and may enroll.
• Presence of an oral temperature ≥ 37.8º C, or acute symptoms greater than "mild" severity on the scheduled date of first vaccination.
• Any confirmed or suspected immunosuppressive or immunodeficient condition including history of human immunodeficiency virus (HIV) infection.
• Receipt of cytotoxic or immunosuppressive drug within 6 months of study enrollment.
• Any significant disorder of coagulation or treatment with Coumadin derivatives or heparin.
• Administration of any non-influenza vaccines within 30 days before study enrollment or during the study period.
• Use of any investigational or non-registered product (drug or vaccine) or planned participation in another investigational study within 30 days prior to study enrollment, or during the study period.
• Receipt of any immunoglobulins and/or any blood products within 3 months of study enrollment or planned administration of any of these products during the study period.
• Any known or suspected allergy to any constituent of influenza vaccines.
• Known pregnancy or a positive urine beta-human chorionic gonadotropin (ß-hCG) test result prior to dosing on Study Days 0 or 21.
• Lactating or nursing.
• Women of child bearing potential who lack a history of reliable contraceptive practices.
• Known receipt of analgesic or antipyretic medication on the day of treatment