It might be the adjuvant - a substance that improves performance - in the vaccine itself.
Listen to Dr Norman Swan and Dr Preeya Alexander discuss the latest findings on the ABC National’s Health Report.
The clip runs for 7 minutes.
Another twist in story of shingles vaccination and dementia
The lower risk of dementia that seems to be associated with vaccination against shingles might not have anything to do with protection from the virus.
Subscribe to our newsletter
Sign up to our eNewsletter to receive updates on content, resources, news and events from Compass – guiding action on elder abuse.