In 2010, a college lecturer from Colorado began experiencing worrying indicators of cognitive decline.
The lecturer—a 63-year-old viral immunologist whose identification has been stored nameless—suffered alarming signs, together with impaired reminiscence, waning focus, and problem studying. Whereas giving lectures to college students, he discovered he had problem focusing and was usually unable to complete sentences with out pausing. However medical assessments, together with a mind biopsy, didn’t get to the supply of the issue, and over the subsequent 4 years, his signs continued to progress.
His decline would have seemingly continued unabated had he not heard a couple of case of encephalitis—severe mind irritation brought on by a reactivation of the varicella-zoster virus, mostly related to childhood chickenpox and, later in life, shingles.
Remembering that his personal signs had been preceded by a short case of shingles, subsequent assessments confirmed the affected person had certainly skilled a reactivation of varicella-zoster. And so he determined to deal with the issue with a course of acyclovir, an antiviral drug generally prescribed to shingles sufferers. To his colleagues’ amazement, the Colorado lecturer’s signs shortly pale away and his cognition returned to regular.
This outstanding case examine, published in 2016, has impressed neurovirologists to look deeper into the connection between shingles and mind ageing. For many years, shingles has been predominantly related to a type of nerve ache referred to as postherpetic neuralgia, which could be so extreme that it was once cited because the main explanation for pain-related suicide within the aged. Now, analysis is beginning to reveal the devastating influence that shingles can have on mind well being.
In keeping with Andrew Bubak, assistant professor of neurology on the College of Colorado Anschutz, the true burden of varicella-zoster “is completely underestimated. However it’s a really treatable virus.”
Lately, growing numbers of research have proven that the shingles vaccine seems to be able to defending the ageing physique and mind, and dementia specialists are taking be aware. In April 2025, a major study by researchers at Stanford College recommended vaccination in opposition to shingles may stop one in 5 new instances of dementia. More recent studies have additionally linked getting a shingles vaccine to slower organic ageing throughout quite a lot of measures.
One rationalization given for the findings is that the vaccine is perhaps stimulating the immune system in a broadly helpful method. Whereas there may be seemingly some reality on this, extra analysis more and more factors to the worth of avoiding shingles (or reactivations of the varicella-zoster virus) within the first place, with two separate research discovering associations between shingles and self-reported cognitive decline and dementia.
Neurovirologists consider this rising knowledge underlines the significance of avoiding an infection, via the childhood chickenpox vaccination—given to youngsters within the US since 1995 and launched within the UK in January 2026—and thru the grownup shingles vaccine and booster jabs in later life.
Earlier than the US began routinely vaccinating in opposition to chickenpox, greater than 90 % of youngsters acquired the varicella-zoster virus in childhood. Following the an infection, the virus takes up place within the peripheral nervous system—the neurons linking the mind and spinal wire to the limbs and organs—the place it stays dormant, typically for many years.
Varicella-zoster can reactivate within the physique following numerous triggers, which vary from acute stress to concussion, co-infections with Covid-19, immunosuppressive medicines, and the general aging of the immune system. In lots of instances, such reactivations could also be fully symptomless, with some studies suggesting many people may unknowingly expertise repeated “subclinical” reactivations—the virus reawakening from its dormant state with out inducing seen signs—in mid- to later life.
