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.