Nearly three years into the pandemic, scientists are still trying to figure out why some people get long COVID and why a small portion have lasting symptoms.
Several studies suggest the ubiquitous Epstein-Barr virus could play a role in some cases of long COVID.
Henrich is among researchers who have found immune markers signaling Epstein-Barr reactivation in the blood of long COVID patients, particularly those with fatigue. Stanford University researchers are among those who have found evidence that the coronavirus can infect fat cells. In a recent study, they found the virus and signs of inflammation in fat tissue taken from people who had died from COVID.
Scientists at the University of Texas Southwestern Medical Center are studying leptin, a hormone produced by fat cells that can influence the body's immune response and promote inflammation. Most people who have lingering, recurrent or new symptoms after infection will recover after about three months. Among those with symptoms at three months, about 15% will continue to have symptoms for at least nine more months, according to a recent study in the Journal of the American Medical Association.
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