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Sick pigs at the 1918 Cedar Rapids Swine Show in Iowa and scientists' accidental release of an "extinct" flu virus in 1977 played key roles in creating a strain that has swept the globe and sparked fear of a more deadly flu season this winter.
In 1918, while a flu virus from birds was infecting humans with deadly results, that same virus infected pigs. For nearly the next 40 years, the virus evolved, sporadically infecting humans. Then, in 1957, the virus vanished when another virus emerged,