Earlier quoted context omitted.
I think you have this oversimplified. Stringing together inferences can take us in either direction. It really depends on how things are being done and this isn't always so obvious or simple. But just to show both directions I'll give two simple examples (real world holds many more complexities) It is all about what is being modeled and how the inferences string together. If these are being multiplied, then yes, this…
Can’t you improve thing if you can calibrate with a known good vampire? You’d think NIST or the CDC would have one locked in a basement somewhere.
I'm not a virologist or whoever designs these kinds of medical tests. I don't even know the right word to describe the profession lol. But the question is orthogonal to what's being discussed here. I'm only guessing "probably" because usually having a good example helps in experimental design. But then again, why wouldn't the original test that we're using have done that already? Wouldn't that be how you get that 95% accurate test?
I can't tell you the biology stuff, I can just answer math and ML stuff and even then only so much.