This study will evaluate the safety and immunogenicity of VAX161B [STF2.HA5 H5N1], a recombinant, inactivated, subunit influenza vaccine given as a two dose regimen at a range of doses.

The purpose of this study is to test an investigational vaccine known as "VAX161B". VAX161B is a vaccine for the influenza A virus subtype H5N1 avian influenza virus (bird flu). In this study, the subject will receive the VAX161B vaccine at one of five doses to see which does might be the best. VaxInnate want to find out how safe these vaccines are and how well they are tolerated by people who receive them. To measure how effective each type of vaccine is, VaxInnate will test the ability of the body to develop an immune response, which means how well the body recognizes and defends itself against the influenza virus.

Inclusion Criteria:

• male or female aged 18 - 49 years inclusive
• give written informed consent to participate
• healthy, as determined by medical history, physical examination
• comprehension of the study requirements
• willing to provide multiple blood specimens collected by venipuncture.

Exclusion Criteria:

• Subjects who have a psychiatric illness, a chronic illness that would interfere with participation or interpretation of results
• clinically significant abnormal liver function tests
• positive serology for HBsAg or HCV antibodies
• impaired immune responses
• history of anaphylactic type reaction to injected vaccines
• history of drug or chemical abuse in the year prior to screening
• history of Guillain-Barré Syndrome
• history of chronic obstructive pulmonary disease or history of other lung disease