The latest shingles vaccine may delay or possibly even prevent the onset of dementia more effectively than an older version. Being vaccinated against shingles has been linked to dementia protection before. Now, it seems that a vaccine called Shingrix, which has been available since 2017, reduces the risk of developing the condition in the next six years by 17 per cent more than an older vaccine called Zostavax. Shingles occurs when the varicella-zoster virus, which causes chickenpox and stays in the body, becomes reactivated at a time when the immune system is weakened, such as when someone is stressed or having chemotherapy. This results in a painful rash, which can sometimes get infected or scar.