THE SPANISH FLU

Influenza A(H1N1)Normally Humans are the major Hosts of the influenza viruses, and severe respiratory disease is the primary manifestation of infection. Influenza A viruses closely related to those prevalent in humans. However, circulate among many mammalian and avian species. Some of these may undergo antigenic mutation or genetic recombination and emerge as new human epidemic strains.
Major breaks of Influenza A usually occur at 2-3 years intervals. Influenza B appears usually every 4 to 5 years. The Spanish flue killed nearly 20 million people in 1743, 1889-1890,1918-919.
Here is swine flue

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