Safety and Immunogenicity of Two Doses of aH5N1 Vaccine in Adult and Elderly Subjects With and Without Immunosuppressive Conditions *aH5N1:Monovalent H5N1 Influenza Vaccine

Inclusion Criteria: * Male and female individuals 18 years of age and older at the time of enrollment who are mentally competent, willing and able to understand the nature and risks of the proposed study, and able to sign the consent form prior to study entry; * Individuals who are able to comply with all study procedures and requirements; * Healthy volunteers and volunteers specifically HIV positive, transplant recipients, cancer patients may be eligible; * Please contact the site for additional eligibility criteria. Exclusion Criteria: * Individuals who are not able to follow all the required study procedures for the whole period of the study; * Individuals with behavioral or cognitive impairment or psychiatric disease that, in the opinion of the Investigator, may interfere with the subject's ability to participate in the study; * Please contact the site for additional eligibility criteria.