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It’s a long standing problem with these kind of rapid diagnostics for respiratory illnesses:

https://www.cbsnews.com/news/rapid-flu-tests-only-50-to-70-p...

Doing two swabs helps mitigate this, as does comparing anal and oral swabs. Here’s a more thorough breakdown:

https://www.tandfonline.com/doi/full/10.1080/22221751.2020.1...



Pretty sure even I could tell the difference between an anal swab and a nasal swab.


Maybe people are confused because both their noses and butts smell?




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