This year’s flu season got off to an alarming start, with hospitalization rates more than 10 times those of past years’ seasons. But as Americans travel for the holidays this week, new data show an encouraging downturn in flu activity in some parts of the country. Some believe that this means this year’s flu season may be unique only in its timing, not its severity. “It looks like right now that flu is coming down, and by the time it’s all done, it will be just another average flu year, it just came early,” said Michael Osterholm, an epidemiologist and...