When they identify a person with symptoms, they certainly isolate that person, but they also do contact tracing. Standard practice is to tell everyone who’s interacted with an infected person to self-quarantine for 14 days, even if they aren’t symptomatic. If that happens soon enough and is thorough enough, it can in principle prevent all presymptomatic transmission.
Yeah, I agree that contact tracing & testing/quarantining contacts is good, and that presymptomatic transmission is possible.
It looked to me like you were claiming that the hypothesis “stopping all symptomatic transmission is sufficient to prevent the number of COVID-19 cases from curving upwards” has been tested by some countries’ measures and found to be false, and I am questioning that apparent assertion.
When they identify a person with symptoms, they certainly isolate that person, but they also do contact tracing. Standard practice is to tell everyone who’s interacted with an infected person to self-quarantine for 14 days, even if they aren’t symptomatic. If that happens soon enough and is thorough enough, it can in principle prevent all presymptomatic transmission.
Yeah, I agree that contact tracing & testing/quarantining contacts is good, and that presymptomatic transmission is possible.
It looked to me like you were claiming that the hypothesis “stopping all symptomatic transmission is sufficient to prevent the number of COVID-19 cases from curving upwards” has been tested by some countries’ measures and found to be false, and I am questioning that apparent assertion.