That was my thought as well - basically, how do you know if the strain doesn't kill if you don't check for severe and lethal cases linked to the same strain? I understand the part about looking for specific mutations, and assuming they would indicate the "usual" complications with the deadlier strains would not be present, but mutations are not exactly predictable, right? If they don't cause the sympthoms of the current deadly strain - they may be causing something else completely, which could be as deadly a little bit later down the line - isn't this a reasonble concern, @danieltillett?
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