I don't see why everyone seems to want to write of Soto's positive as a simple false positive. False positives are rare. Someone here said false negative are 15% and false positive, 10%. I don't think that's correct, I think false positives are closer to 2%. However, many of the false positive are people who had the virus (asymptomatic) and are over it. In that case, some of the virus remains in your system but you are no longer infected nor contagious. What they should do is test him for antibodies.