High-dose influenza vaccination associated with lower Alzheimer’s risk

Researchers led by UTHealth Houston analyzed data from nearly 200,000 adults aged 65 and older to compare Alzheimer’s disease risk in people who received high-dose or standard-dose influenza vaccines. The report, published in *Neurology*, describes an observational association; the source does not provide further details on the study period, data source, or adjustment methods.

Standard-dose vaccination was associated with a 40% lower risk of Alzheimer’s, while high-dose vaccination was associated with a reduction of nearly 55%. The association was reported to be more pronounced among women. High-dose influenza vaccines contain four times the antigen of standard-dose formulations.

The findings extend earlier research linking influenza vaccination with lower Alzheimer’s risk, but they do not show that the higher dose prevents the disease. Differences between the groups or other factors could help explain the association, and further research is needed to assess causality and possible mechanisms. The results alone do not establish an Alzheimer’s-prevention benefit from choosing a high-dose formulation.