A more relevant question is what the PCR tests for. They test for 18 character sequences that they think are unique. These sequences have turned out not to be unique in many circumstances. For instance the WHO reference test 18 character sequence is on human chromosome 8. Also the any number of coronovirus that share the same sequence. Without the testing reference data from each test manufacturer we could be testing for something is in every human. So stupid. It is important to understand that they are not directly testing for a virus. And we cannot know what small sequences they are testing for if they do not publish it.
A more relevant question is what the PCR tests for. They test for 18 character sequences that they think are unique. These sequences have turned out not to be unique in many circumstances. For instance the WHO reference test 18 character sequence is on human chromosome 8. Also the any number of coronovirus that share the same sequence. Without the testing reference data from each test manufacturer we could be testing for something is in every human. So stupid. It is important to understand that they are not directly testing for a virus. And we cannot know what small sequences they are testing for if they do not publish it.