The problem is designing a successful control. The best thing is to create multiple control groups. The point is that testing a human, even a non-sick human is different than testing a pine-apple. But by testing a human there is contamination of your control because you don't know to what extent the control group actually has omicron, especially given its weakness.
So what you do is both. Measure the result exposing it to only air. Measure the result after touching different surfaces. Measure the result on healthy people. Measure the result on sick people. Measure the result when the swab hasn't even touched outside air. Maybe it come pre-contaminated. We should test that.
I started thinking about this last night. You're right. In order to find a suitable control replacement for saliva we need to know how the tests work. And the control substance needs to be easily available to poalers. My current thought is that we should use distilled water, with the pH adjusted for human saliva.
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