RE: Guardian article22 May 2020 08:03
Oh, well now I feel foolish. You were referring to a completely different link referring to a test where :
‘the subject cough to produce sputum, which release the virus from deep in the lungs‘
and it’s as simple as:
‘To use your product, SARS-CoV-2 nucleic acid is first extracted, isolated and purified from oropharyngeal (throat) swab, nasopharyngeal swab, nasal swab, and oral fluid specimens. The purified nucleic acid is then reverse transcribed into cDNA followed by PCR amplification and detection using an authorized real-time (RT) PCR instrument‘
Silly me.