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HSV-1 impact on brain immune function

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2026-10-27 07:14 UTC → 2026-11-03 21:38 UTC · added ~~removed~~

Research published in PLOS Pathogens indicates that Herpes Simplex Virus type 1 (HSV-1) may alter the molecular functioning and genetic expression of microglia, the brain’s primary immune cells. Experimental studies on mice suggest that while these cells activate to fight the virus, the infection can trigger changes in their genetic activity that extend beyond immediate inflammation. Neuroscientists have noted that this process may reprogram immune cells into an ‘emergency defense mode,’ potentially impairing their ability to perform essential daily functions, such as clearing cellular debris and regulating neuronal connections, even after the virus is no longer active. This dysfunction is being investigated for potential links to neurodegenerative conditions, including a possible doubling of dementia risk and connections to Alzheimer’s disease. Recent findings from the University of Colorado Anschutz and other US institutions suggest that the observed viral impact on immune cells aligns with inflammatory processes seen in human Alzheimer’s patients. This mechanism may provide a clearer explanation for the connection between the virus and the disease. According to the World Health Organization (WHO), approximately 3.8 billion people under the age of 50 are infected with HSV-1, representing about two-thirds of that age group. Additionally, medical experts have highlighted the specific risks HSV-1 poses to newborns, noting that the virus can cause life-threatening illnesses in infants due to their underdeveloped immune systems.

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