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Scientists at the University of California San Francisco have discovered that remnants of the COVID-19 virus can linger in blood and tissue for more than a year after a person is first infected.

In their research on long COVID, the scientists found COVID antigens in the blood for up to 14 months after infection and in tissue samples for more than 2 years after infection.

"These two studies provide some of the strongest evidence so far that COVID antigens can persist in some people, even though we think they have normal immune responses," Michael Peluso, MD, an infectious disease researcher in the UCSF School of Medicine, who led both studies, said in a statement.

Scientists don't know what causes long COVID, in which symptoms of the illness persist months or years after recovery. The most common symptoms are extreme fatigue, shortness of breath, loss of smell, and muscle aches. Head over to Medscape to read the full story.