You can just destroy the virus, e.g. by grinding it down or via a certain chemical and then you have a resulting crude mixture of RNA + other virus parts. In th

You can just destroy the virus, e.g. by grinding it down or via a certain chemical and then you have a resulting crude mixture of RNA + other virus parts. In the past you had to separate the RNA first, but with newer methods you can do the PCR directly on the crude mixture.