molecular model of influenza virus hemagglutinin

h3n2 1968 hong kong virus influenza flu vaccine 3d pandemic medical illustration science avian background molecular human contagious health biology virology headache microbiology small disease infectious orthomyxoviridae structure concept wallpaper cell orthomyxovirus pathology swine epidemic superbug diagnosis cold illness infection microscopic glycan glycosylation hemagglutinin immune response spike molecule microscope glycosylated