Vaccines may reduce dementia risk, experts hypothesize

A growing body of research suggests that routine vaccinations, including those for flu, Tdap, pneumococcal infections, and hepatitis, may be linked to a reduced risk of dementia. Scientists are exploring a novel hypothesis: these vaccines might be training the innate immune system, a part previously thought untrainable. This 'trained immunity' involves epigenetic changes that prime immune cells to respond more robustly and rapidly to subsequent threats, potentially offering protection beyond the targeted pathogen. If validated, this could deepen our understanding of the immune system and open new avenues for dementia prevention and treatment, adding another significant benefit to widespread vaccination efforts.