National Institutes of Health (NIH): Community Immunity ("Herd" Immunity)
National Institutes of Health (NIH): Scientists Model Immune Variation and Responses to Flu Vaccination
National Institutes of Health (NIH): Antigenic Shift of the Flu Virus
National Institutes of Health (NIH): Antigenic Drift of the Flu Virus
National Institutes of Health (NIH): H1N1 Influenza Virus Particles
National Institutes of Health (NIH): H5N2 virus trapped in carbon nanotubes
National Institutes of Health (NIH): H1N1 influenza virus particles
National Institutes of Health (NIH): Prototype for a Universal Flu Vaccine
National Institutes of Health (NIH): 3D Print of Hemagglutinin (HA)