Here is an accurate Chemical Testing explanation of:
1) the mechanics if a swab taken & PCR Covid Tested 
2) how lab instrument is calibrated3) Why a PCR test is wildly inaccurate and 
can in NO circumstances accurately diagnose a Covid patient . . .
Also the COVID Virus has NEVER been isolated -- PCR test will reacts to almost 
ANY substance. The PCR inventor Dr K Mullis declared that NO Viral load can be 
measured . . . 

https://www.brighteon.com/b91f0a0a-3906-4061-a782-9207c76dc3c4