Study Comparing the Immune Response and Safety of Fluarix and Fluzone Influenza Vaccines in Children

Inclusion Criteria: * A male or female child age 6 months to \< 18 years at the time of the vaccination; children who may or may not have had previous administration of influenza vaccine in a previous season are acceptable. * Subjects having a parent/guardian who the investigator believes can and will comply with the requirements of the protocol should be enrolled in the study. * Written informed consent obtained from the subject's parent/guardian; assent obtained in subjects \> 10 years. * Female subjects of childbearing potential must agree to take a pregnancy test. Exclusion Criteria: * Use of any investigational or non-registered product (drug or vaccine, other than the study vaccine) within 30 days preceding the administration of the study vaccine, or planned use during the study period. Routine, registered childhood vaccinations are not an exclusion. * History of hypersensitivity to any vaccine. * History of allergy or reactions likely to be exacerbated by any component of the vaccine. * Acute disease at the time of enrollment. * History of Guillain Barré syndrome within 6 weeks of receipt of prior inactivated influenza virus vaccine. * Pregnant or lactating female. * Receipt of an influenza vaccine outside of this study, during current (2006-07) flu season.