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There have been many influenza epidemics. There are now two well-known pandemics (covers a much larger world-wide area than an epidemic or a smaller outbreak). The "Spanish Flu" pandemic was in 1918 and 50-70 million people died of the virus. The most recent pandemic was the H1N1/09 "Swine Flu" pandemic beginning in 2009 with some isolated cases still ongoing in 2012.
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∙ 11y ago
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∙ 15y agoIn 1931, viral growth in embryonated hens' eggs was discovered, and in the 1940s, the US Military developed the first approved inactivated vaccines for influenza, which were used in the Second World War. (Wikipedia)
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∙ 11y agoWiki User
∙ 12y agoit was two pigs in Mexico the combine their virus, so started in Mexico
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∙ 14y agoDiscovered in 1931 by Richard Shope.
Following his work, a British research team led by Patrick Laidlaw was able to isolate the virus from humans in 1933.
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∙ 14y agojohn marquez znd veroo
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∙ 14y agoit first started in the 1400's
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∙ 11y agoscientist
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I believe most scientists would agree that this is not currently known. Some, however, would say that there was no "before" - that time itself started with the Big Bang.
What do most scientists believe existed before the incident known as the big bang theory?
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