Kenny Wong, Dr. Jeffrey C. Kwong and colleagues at the University of Toronto examined health databases in Ontario province to examine the association between influenza vaccination and all-cause mortality among community-dwelling individuals age 65 and older for nine influenza seasons -- 2000-2001 to 2008-2009.
The researchers used instrumental variable analysis to limit confounding.
The study published in the Archives of Internal Medicine found the seasonal flu vaccination was associated with a 6 percent reduction in mortality during flu seasons -- for all causes -- which was not statistically significant.
However, the influenza vaccination was associated with reductions in hospitalizations for pneumonia and influenza, but not mortality alone, the study said.
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