> The premise that there is an "asymptomatic strain" is still theoretically possible but unsubstantiated, despite ongoing investigation.
He doesn’t seem to be arguing that a previously unidentified “asymptomatic strain” - or the effects of such - is currently known. If I understand his reasoning, he’s saying that it’s theoretically possible that a milder strain might exist, and that in order to find and isolate that strain (if it exists) we would need to be blanket testing people in outbreak areas, partitioning those samples by outcome, then sequencing the positive tests.
Once you have a set of sequences from positive tests from people who were and remained asymptomatic, then you can isolate the variants that lead to that and begin testing to see if any of those variants consistently present no (or very limited) symptoms AND confer immunity to the pathogenic strains of 2019-nCoV.
He doesn’t seem to be arguing that a previously unidentified “asymptomatic strain” - or the effects of such - is currently known. If I understand his reasoning, he’s saying that it’s theoretically possible that a milder strain might exist, and that in order to find and isolate that strain (if it exists) we would need to be blanket testing people in outbreak areas, partitioning those samples by outcome, then sequencing the positive tests.
Once you have a set of sequences from positive tests from people who were and remained asymptomatic, then you can isolate the variants that lead to that and begin testing to see if any of those variants consistently present no (or very limited) symptoms AND confer immunity to the pathogenic strains of 2019-nCoV.