symptoms months after they got infected. we're talking brain fog, fatigue and for some organ damage. scientists still don't know what causes it, but a new study today from the cdc found that roughly a third of covid-19 survivors may be affected. my next guest is part of a research team studying the illness. dr. terry harville joins me now. thank you for being with me. after you get the initial sick ness and then this comes. do we know why this is happening for a certain population who get covid? >> our studies are looking at this. based on the way the immune system normally functioned, if you make an antibody against a substance like the spike protein that binds to the h-2 component,