It's not a second infection, it's just epithelial cells turning over in the lungs, releasing just enough viral RNA to amplify into a positive test result: http:

It's not a second infection, it's just epithelial cells turning over in the lungs, releasing just enough viral RNA to amplify into a positive test result: http://www.koreaherald.com/view.php?ud=20200429000724 http://www.koreaherald.com/view.php?ud=20200429000724