A new theory that reactivated older viruses are driving some of long Covid-19’s debilitating symptoms is gaining traction among some patient advocates
Most people—whether they have had Covid-19 or not—have dormant, normally harmless viruses in their body that they contracted years earlier. Among the most common are the herpes family of viruses. That includes the Epstein-Barr virus , which causes mononucleosis, as well as human herpesvirus 6 , which causes the common childhood illness sixth disease, the herpes simplex viruses, and herpes zoster, a reactivation of the chickenpox virus that can cause shingles.
Some long Covid-19 patients and advocacy groups are urging doctors to test more regularly for reactivated viruses. With so few treatment options for long Covid-19, they say, it makes sense to see if a herpes antiviral drug might relieve symptoms. Some doctors say it is worth more testing and further study. Others say the tests are difficult to interpret—and that even if a latent virus does reactivate, it is unclear whether that is causing long Covid-19 symptoms.
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