A new study from the University of Michigan has yielded more evidence that getting a flu shot 2 years in a row may result in lower vaccine effectiveness (VE) in the second year, and also that the effects of a flu shot may last more than one season.
The researchers, who followed 321 households through the 2012-13 flu season, found that individuals who were vaccinated only in that season enjoyed better protection than those who were vaccinated in both the 2011-12 and 2012-13 seasons, according to their report in the Journal of Infectious Diseases.
