This Thursday, Jan. 10, 2013, photo shows vials of flu vaccine in Philadelphia. This season's flu shot did almost no good at protecting people over 65 from the worst and most dominant flu strain spreading around, according to a government study released Thursday, Feb. 21, 2013. Vaccinated people in that age group had only a 9 percent lower chance of going to the doctor with flu symptoms from the dominant virus than people who didn't get the shot.
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