…until you read down the article, and see how small the percentage is, and the fact it is not protection, but a small delay in diagnosis.
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The researchers found that people who got Shingrix had a 17% lower chance of being diagnosed with dementia in the six years after their shots than people who got the less-effective Zostavax vaccine.
People who were vaccinated didn’t avoid dementia completely, but it did seem to be associated with a delayed diagnosis. On average, the researchers said, this represents about 164 diagnosis-free days, or about five months more time, in people who were eventually affected.
My comment that is substantial and very interesting. There may be links that matter in other lines of research.