Thank you - it is not a definitive study - problem is - there are so many different antigen tests - by different manufacturers - and those can vary as to reliability and false neg/pos rates.
tests out of china - from early on - were so unreliable as to be worthless. typical Chinese - give us the dollars and we will screw you over and remain safe in our Communist redoubt.
This Wuhan virus pandemic should be a non-partisan issue - but has been politicized on both sides.