PCR test doesn't tell if a virus is alive or not! Kary Mullis explains

Dr. Kary Muller is the inventor of the PCR test explains how to use the test and how they have used PCR's and mis-interpret things with it.
After 3:10 into the video, Dr Mullis clearly says, "PCR does not tell you that your are sick or if that thing you've ended up with was going to hurt you or not"!!