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Australia had a particularly hard flu season this year, which may predict similar challenges for the U.S. Pascal Pochard-Casabianca/AFP/Getty Images hide caption

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Pascal Pochard-Casabianca/AFP/Getty Images

In The U.S., Flu Season Could Be Unusually Harsh This Year

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A hog gets a closeup at the Illinois State Fair in August. Officials took special precautions to make sure no livestock sick with a new strain of swine were part of the fair. Seth Perlman/AP hide caption

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Seth Perlman/AP