Some people who have received a dose of the Moderna COVID-19 vaccine are having a delayed reaction that causes a red, and sometimes bumpy rash on the arm.
"And so trying to tease out what symptoms might or might not have been due to having COVID-19 in the past is incredibly important," says Dr. Lance Baldo, M.D., chief medical officer for Seattle based, Adaptive Biotechnologies.
The company is now marketing the first widely available test of its kind to tell whether someone has been infected with the virus months after the fact. It employs a sophisticated process to detect the activity of T-cells, which are a key part of the body's immune response.