Not only is EBV reactivation a problem, the HSV1 (cold sore virus) has now been shown to change the brain’s immune response and trigger inflammation even after the virus is gone

In an r/covidlonghaulers post, the OP (u/racoonv2) relayed and extended a finding: severe COVID-19 can "wake up" latent viruses (EBV, CMV, HSV, enteroviruses, etc.), noting that HSV-1 (the cold sore virus) has been shown to alter brain immune responses and trigger inflammation even after the virus is cleared. Most comments were patient corroboration: u/Sea-Investigator9213 described chronic HSV reactivation after COVID, taking 2×500mg Valtrex daily or being bedridden for weeks; u/HDK1989 argued all HSV carriers should be on lifelong antivirals; u/metodz noted type 1 is more likely than type 2 to cause brain inflammation. On the factual side, the post's cited source is a CIDRAP report on a Nature study (Melamed et al., 2026, s41586-026-10740-z): based on the IMPACC longitudinal cohort of 1,154 hospitalized COVID patients, 11 reactivated viruses were detected within 40 days of admission, among which reactivation of Anelloviridae (latent in ~90% of the population) was significantly associated with long COVID and long-term physical dysfunction; early EBV reactivation and HSV-1 were also detected. On the speculative side, claims on Reddit such as "lifelong antivirals" are personal coping experiences, not treatment guidelines.

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