Recent studies have revealed that the brains of Alzheimer patients often have high concentrations of herpes virus (https://www.theguardian.com/society/2018/jun/21/alzheimers-link-to-herpes-virus-in-brain-say-scientists). It is uncertain whether the virus (sometimes linked to sexual activity) has a role in creating the dementia or whether the neurological condition predisposes individuals to infection. This is yet another factor that needs to be considered in attempts to develop treatments that might prevent Alzheimer's or treatments that can be applied to patients with the neurological condition.
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