Last month, an average of 4 percent of Americans reported being sick with the flu on any given day, according to a Gallup report released January 8. Because December isn't even peak flu month — reports tend to be their highest in January and February — pollsters say this just might become "the worst flu season in Gallup's records." (January 2013 saw an all-time high of 4.7 percent.)
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What makes this year's flu so terrible?