Influenza A virus subtype H5N1. Influenzavirus A, Influenza, Pathogen, Transmission and infection of H5N1, Avian influenza, Endemic (epidemiology), Global spread of H5N1, Mutation, Influenza pandemic, Influenza vaccine, Herd immunity, H5N1 genetic structure, Hemagglutinin (influenza), Viral neuraminidase, Orthomyxoviridae, Amantadine, Rimantadine, Social effects of H5N1, H5N1 clinical trials, Influenza research