Overview
- The multi‑institution analysis published Wednesday examined 1,154 adults hospitalized with COVID‑19 between May 2020 and March 2021 and found evidence of at least one reactivated latent virus in about 47.9% of patients.
- Researchers detected 11 reactivated viruses, most commonly Epstein–Barr virus, herpes simplex, cytomegalovirus and members of the Anelloviridae family, using blood, nasal swabs and lung samples collected over roughly the first 40 days of illness.
- Different virus families reactivated on distinct timelines: Epstein–Barr and anelloviruses surged early after admission, while cytomegalovirus and herpes simplex typically appeared around three weeks and were often found in respiratory samples.
- Viral reactivation was tied to higher levels of systemic inflammation and poorer clinical outcomes, and it occurred frequently in patients who were not taking immunosuppressive drugs, suggesting stress or inflammation may trigger awakenings.
- The authors caution that the cohort was unvaccinated and infected before newer variants, so follow‑up studies are needed to test causality, confirm links to long COVID—notably the association of anellovirus activity with long‑term physical disability—and evaluate antivirals or monitoring as interventions.