Creative Biolabs' Anti-Influenza A Virus H1N1 Hemagglutinin HA2 subunit Recombinant Antibody Fab Fragment (1E1) is a Human monoclonal antibody. The Anti-Influenza A Virus H1N1 Hemagglutinin HA2 subunit Recombinant Antibody Fab Fragment (1E1) was generated using HA as the antigen. This antibody has been shown to work in applications such as: EIA, Immunoassay, and ELISA.