Photo: Zhang et al./Science Some...  ...: Zhang et al./Science Some strains of the flu virus, like the H5N1 bird flu virus, are highly lethal but aren't eas...  ...with the highly contagious H1N1 swine flu strain responsible for infecting tens of million...

If you don't know your H5N1 from your H7N9, David McCandless of Information is Beautiful along with Ella Hollowood and Phillipa Thomas came up with this handy dandy Venn Diagram of Influenza t...