An independent meta-analysis of vaccines against influenza has found that claims of benefit have been significantly exaggerated.

The report, released last month by the University of Minnesota’s Center for Infectious Disease Research and Policy, was based on a comprehensive review of data published from 1967 to 2012.1

Evidence for “consistent high-level protection is elusive,” the researchers concluded. Although vaccination was found to provide modest protection from infection in young healthy adults who rarely have complications of flu, the authors found that “evidence for protection in adults 65 years of age and older [who represent over 90% of deaths from flu] . . . is lacking.”