Bahramian, Elham, Furr, Mercede, Wu, Jerry T et al. · Frontiers in immunology · 2022 · DOI
This study examined how two closely related viruses called HHV-6A and HHV-6B infect different types of nerve cells in the brain. Researchers found that both viruses can infect certain brain cells that use glutamate and dopamine (chemical messengers), but neither virus infected a third type of brain cell that uses GABA. Importantly, HHV-6A appeared to cause more damage to infected cells than HHV-6B, suggesting it may be more harmful to nerve tissue.
Many ME/CFS patients have evidence of HHV-6 reactivation, and understanding how these two distinct viruses differently affect nerve cells could help explain neurological symptoms like brain fog, cognitive dysfunction, and autonomic problems. This research provides cellular-level evidence that HHV-6A may be more damaging to specific brain cell types, which could inform why some ME/CFS patients may have different disease trajectories or symptom patterns depending on which HHV-6 variant is present.
This study does not prove that HHV-6A or HHV-6B causes ME/CFS, nor does it demonstrate these mechanisms occur in living patients. The findings are from laboratory cell cultures and may not reflect the complex immune and neurological environment of the human brain. The study does not establish causation between viral infection patterns and specific ME/CFS symptoms.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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