Im not sure, but there is a theory infections can gradually creep along nerve cells, and if it does reach the brain then it may precipitate certain neurological conditions, specifically plaque based ones like Alzheimer's. The immune system recognizes an infection and responds, but destroys sensitive neural tissue in the process, leaving behind protein plaque scars.
Robin Williams had Lewy body dementia, which is literally just protein deposits building up in and around nerve cells in the brain. Its the second most common form of dementia after Alzheimers.
Anyway I mention it because RW also is reputed to have suffered from a very aggressive strain of herpes for most of his adult life, he actually got sued by a former girlfriend decades ago for giving her herpes. Even on meds his constant viral flare ups probably caused or massively accelerated his lewy body dementia.
Of course this is all cutting edge unproven science, like my other post on Soy / isoflavone metabolism. Cucks will deny there is anything wrong with soy or herpes.