This year is shaping to be a tough flu season, with less than half of adults getting a flu shot. | Hugh Hastings/Getty Images Let’s start with the bad news. There’s a decent chance, perhaps as high as 11 percent if you’re unvaccinated, that some time over the course of this winter, you’ll be overcome with chills, followed by extreme fatigue, body aches and cough, and culminating in a sudden spike in fever. Congratulations: you have the flu. Every winter in the US has its share of flu cases, but this season is shaping up to be particularly bad. Early this week the Centers for Disease...

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