[pama]

I'm not sure what test you have in mind, and I'm guessing that such tests with high false positive bias might exist, for example the antibody tests. It's very difficult to get a genuine false positive with a PCR-based test: whatever you're reading out should have the same sequence as the part of the virus you're sequencing. The only reasonable way to get a false positive is that you contaminate the sample, but I don't think that the possibility of contamination is part of the design in any of the commercially available tests.