Safety and Immunogenicity of Two Doses of a Tetravalent Influenza Vaccine in Adults Aged 18 Years and Above

Inclusion Criteria: * Healthy subjects (aged 18 years and above) who have signed an informed consent form Exclusion Criteria: * Any acute or chronic illness * Receipt of seasonal influenza vaccine for the current season 2007/2008 * Known or suspected impairment/alteration of immune function * Receipt of another vaccine within 3 weeks prior to Visit 1 or planned vaccination within 3 weeks following the last study vaccination * Any serious disease * Hypersensitivity to eggs, chicken protein, chicken feathers, influenza viral protein,neomycin or kanamycin or any other component of the study vaccine * Receipt of blood, blood products or immunoglobulins 3 months prior to vaccination