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This year’s flu vaccine is not very effective at preventing the flu, particularly among adults, according to new estimates from the Centers for Disease Control and Prevention.
In a study of more than 2,000 people in the United States, including both children and adults, researchers found that those who got this year’s flu shotwere just 23 percent less likely to go to the doctor for flu symptoms than people who didn’t get a shot. This level of protection is quite a bit lower than the level of protection seen in some previous seasons — for example, during the 2012 to 2013 flu season, getting a flu shot reduced people’s risk of needing a doctor’s visit for flu by 56 percent.
This year’s vaccine was most effective for children. But among people ages 18 and older, those who got a flu vaccine were just as likely to go to the doctor for flu as those who were not vaccinated, according to the new study.