@Fenng: A recent study result provides a very interesting explanatory framework for "long COVID": SARS-CoV-2 infection → severe disturbance of the immune system → latent viruses originally suppressed by immune mechanisms such as T cells lose control → EBV, CMV, HSV, etc. replicate again → further causing inflammation, immune activation...

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long-covid sars-cov-2 immune-system virology research ebv-reactivation

Summary

A research interpretation on the mechanism of long COVID: SARS-CoV-2 infection may reactivate latent viruses such as EBV, CMV, HSV, causing persistent symptoms. Long COVID may be a multi-mechanism disease.

A recent study result provides a very interesting explanatory framework for "long COVID": SARS-CoV-2 infection → severe disturbance of the immune system → latent viruses originally suppressed by immune mechanisms such as T cells lose control → EBV, CMV, HSV, etc. replicate again → further causing inflammation, immune activation, tissue damage → in some people, symptoms persist even after SARS-CoV-2 has been largely cleared. SARS-CoV-2 "knocked down the first domino," but it may not be the only one causing long-term problems afterward. This is likely a significant piece of the long COVID puzzle; especially it may explain a subset of patients with fatigue, PEM, and brain fog as the main symptoms. But as it now appears, long COVID is more likely a multi-mechanism disease that forms after SARS-CoV-2 disrupts the entire immune-virus ecosystem, rather than simply EBV reactivation.
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Cached at: 08/14/26, 07:30 AM

A recent research finding offers a very interesting explanatory framework for “long COVID”:

SARS-CoV-2 infection

→ Severe disturbance of the immune system → Latent viruses previously suppressed by immune mechanisms such as T cells spiral out of control → EBV, CMV, HSV, etc. begin replicating again → Further inflammation, immune activation, and tissue damage → In some people, symptoms persist even after SARS-CoV-2 has been largely cleared.

SARS-CoV-2 “knocked over the first domino”—what causes problems down the line may not necessarily be SARS-CoV-2 itself.

This is likely a substantial piece of the long COVID puzzle; in particular, it may explain a subset of patients whose symptoms are primarily fatigue, PEM, and brain fog. But as things stand now, long COVID is more likely a multi-mechanism disease that emerges after SARS-CoV-2 disrupts the entire immune–virus ecosystem, rather than a simple case of EBV reactivation.

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