Large-scale study shows that shingles does not cause an increased risk of dementia. This conclusion was made by experts from the London School of Hygiene and Tropical Medicine.
Shingles, caused by the herpes virus, is a very common disease among the elderly. The most common cause is the varicella zoster virus, which causes chickenpox. Some previous studies have linked shingles to an increased risk of various forms of dementia, but other studies have not. And now British scientists conducted a large-scale population study, which showed that shingles even slightly reduces the risk of developing dementia. Therefore, vaccination against the varicella-zoster virus does not lead to a reduction in the risk of dementia.
A side effect of the coronavirus vaccine may be shingles
It is estimated that about 25% of the world's population will experience shingles. There is an opinion that viral infections increase the risk of senile dementia. The current study involved individuals 40 years of age and older. A small subset of people in whom shingles affects the central nervous system, causing encephalitis, for example, were found to be at increased risk of dementia.
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However, encephalitis caused by causes other than shingles also raises the risk of dementia. So the current link is not specific to shingles at all. Available vaccines against this disorder effectively reduce its risk, but alas, they cannot be used as a prophylactic against dementia. (READ MORE) 
London School of Hygiene & Tropical Medicine
Medicine
known for its research, postgraduate studies and continuing education in public and global health
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