Yeah, for sure it can't be 100% effective. I suppose what really matters is out of all the infected (or more precisely, contagious) people, what percentage of

Yeah, for sure it can't be 100% effective. I suppose what really matters is out of all the infected (or more precisely, contagious) people, what percentage of them have a fever. If it's 10%, then it's not worth doing. If it's even 50%, then maybe it could make a significant difference. Fever is one of the three main symptoms (https://www.cdc.gov/coronavirus/2019-ncov/about/symptoms.html https://www.cdc.gov/coronavirus/2019-ncov/about/symptoms.htm...), so it seems like it has to at least be a significant percentage. But just how high a percentage, I don't know.