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Today in History—April 12: The Press Conference That Ended Polio
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A man in a lab coat and glasses, identified as Jonas Salk, handles a rack of test tubes at a press conference related to the polio vaccine, with laboratory equipment visible in the foreground.
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Today in History—April 12: The Press Conference That Ended Polio: Media

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April 12, 1955: The day polio met its match
© Bettmann/Getty Images; Photo Illustration Encyclopædia Britannica, Inc.