Obesity limits effectiveness of flu vaccines, study finds:
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People carrying extra pounds may need extra protection from influenza.
New research from the University of North Carolina at Chapel Hill shows that obesity may make annual flu shots less effective.
The findings, published online Oct. 25, 2011, in in the International Journal of Obesity, provide evidence explaining a phenomenon that was noticed for the first time during the 2009 H1N1 flu outbreak: that obesity is associated with an impaired immune response to the influenza vaccination in humans.
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