10/21/2026
Long COVID shows up in the blood.
Researchers supported by the NIH RECOVER program found that people with Long COVID had inflammation lasting more than 180 days after infection, along with signs of a worn down immune system. A second group of patients showed the same pattern.
People who had more inflammation during their first infection were more likely to develop pain, cough, brain fog and fatigue later.
Read the study: https://doi.org/10.1038/s41590-025-02353-x