The 1918 Spanish influenza
death stats
[back]
[Figures vary by tens of millions. They just make it up to suit which is a WHO trademark, see AIDS in Africa. African disease statistics]
[50 million] 2009 FACTBOX - Some facts about past flu pandemics
[20-40 million] The 'bird flu' that killed 40 million
[50-100 million] Wikipedia/CDC