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A large study from UTHealth Houston found that older adults who received a high-dose flu vaccine had a nearly 55% lower risk of developing Alzheimer's disease — compared to 40% with the standard dose. Researchers analyzed data from nearly 200,000 adults ages 65 and older, with the benefit appearing especially strong in women. The findings, published in Neurology, add to growing evidence linking immune protection to brain health.
A new study published in Neurology suggests that the strength of your annual flu shot might matter for more than just staying healthy during flu season. Researchers at UTHealth Houston analyzed data from nearly 200,000 adults ages 65 and older and found that those who received a high-dose influenza vaccine — which contains four times the antigen of a standard shot — had a nearly 55% lower risk of developing Alzheimer's disease. That's a meaningful jump from the 40% risk reduction previously linked to standard-dose flu vaccination.
The association was especially pronounced in women, and the findings build on a 2022 UTHealth Houston study that first flagged a link between flu vaccination and reduced Alzheimer's risk. Importantly, the study shows an association, not a proven cause-and-effect relationship — more research is needed to understand the underlying mechanisms.
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Why it matters: With Alzheimer's cases set to surge in the coming decades, the idea that an already widely available vaccine could offer meaningful brain-health benefits is significant. High-dose flu vaccines are already CDC-recommended for adults 65+, making this a low-barrier, potentially high-impact intervention worth watching closely.
