Immuno & Reacto of TF Trivalent Influenza Split Vaccine 2003/04 or of Std Formulation Influsplit SSW®/Fluarix™ 2003/04

Inclusion Criteria: * Subjects whose parents/guardians the investigator believes can and will comply with the requirements of the protocol * Male or female children over 6 months of age at the time of vaccination, but who are not yet 6 years old. * All children included in the study must never have been given a prophylactic influenza inoculation. * Written consent to vaccination must be available from both parents or only the single parent after the parents/guardians have been briefed on the study in an understandable language. Exclusion Criteria: * Use of study or unlicensed medication or administration of a vaccine other than the study vaccine within 30 days preceding vaccination and/or during the study period until 30 days after administration of the second vaccine dose. * Acute disease at the beginning of the study * Acute clinically significant changes in the lungs, cardiovascular system, liver or kidney function, identified by physical examination or laboratory tests. * Known allergic reactions that might have been caused by one or more components of the vaccine. * Administration of immunoglobulins and/or other blood products within 3 months before the beginning of the study or planned administration during the study period.