This also betrays a lack of understanding of testing by the doctor. If each test has a 1% chance of returning a false positive (and false positives are possibl

This also betrays a lack of understanding of testing by the doctor. If each test has a 1% chance of returning a false positive (and false positives are possible in most tests), there's a significant chance that one of the 20 will return a false positive, which will then prompt unnecessary treatments, further tests, etc. The general medical guidance is to only test when there's a legitimate suspicion that a patient has the illness. In this case, these patients wouldn't have been tested for a wide range of respiratory issues anyway, and given the pandemic it's much more likely that they've got coronavirus, so they really shouldn't be tested for the other things, especially if asymptomatic.