Demand for the shingles vaccine has surged as many people are seeking not only protection from painful shingles but also a possible reduction in dementia risk. High-street pharmacies report bookings up sharply (Boots bookings more than doubled year-on-year; Superdrug up 41%), and under-65s typically pay about £450 for the two-dose course while some receive it free on the NHS. The trend follows several large observational studies: a natural experiment in Wales around eligibility for the live-attenuated Zostavax found an 8.5% lower dementia rate in vaccine-eligible women over seven years, implying nearly a 20% reduction among those vaccinated; an Oxford analysis of more than 200,000 US records comparing Shingrix (a non-live, adjuvanted vaccine) with Zostavax reported a 17% lower dementia incidence with Shingrix, with a 22% reduction in women and 13% in men and an average gain of 164 dementia-free days.
Scientists propose mechanisms linking latent varicella zoster virus reactivation to brain inflammation and amyloid/tau accumulation, and suggest vaccination may reduce neuroinflammation or boost immune “clearance” of harmful proteins; the Shingrix adjuvant is a leading suspect and similar signals have appeared for an RSV vaccine using the same adjuvant. Other modest population benefits - reduced heart attack and stroke - have been reported. Conflicting results exist: a large English hospital-record study found no Zostavax effect, so causation remains unproven and further research is required, even as many decide to vaccinate based on the current evidence.
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