[oldalum]

 The decline would happen more quickly because of fevers from pathogens with shorter incubation times, which is basically every common illness, right? Yes, good point!

 But I'm not sure you can safely pick out a few dozen cases of covid out of what must be tens of thousands of background fevers.
I assume they are applying appropriate sophisticated statistical techniques to determine what is a significant signal. Their consultants and peer-reviewed publication evidence this sophistication in the past. They have not yet published this study with its methodology.

[oldalum]

 The decline would happen more quickly because of fevers from pathogens with shorter incubation times, which is basically every common illness, right? Yes, good point!

 But I'm not sure you can safely pick out a few dozen cases of covid out of what must be tens of thousands of background fevers.
I assume they are applying appropriate sophisticated statistical techniques to determine what is a significant signal. Their consultants and peer-reviewed publication evidence this sophistication in the past. They have not yet published this study with its methodology.