The present study aims to evaluate safety and immunogenicity of two doses, administered three weeks apart, of two influenza vaccines containing 7.5 micrograms or 15 micrograms of H5N1 influenza antigen, in non-elderly adult and elderly subjects.

Inclusion Criteria:

• Male and female volunteers 18 years of age or older

Exclusion Criteria:

• any auto-immune disease or other serious acute, chronic or progressive disease
• hypersensitivity to eggs, chicken protein, chicken feathers, influenza viral protein, neomycin or polymyxin or any other component of the vaccine.
• history of neurological symptoms or signs, or anaphylactic shock following administration of any vaccine.
• within the past 7 days, they have experienced: any acute disease, infections requiring systemic antibiotic or antiviral therapy.