I would say the opposite. Yes PCR fragments are no longer infectious or contagious but in that instance it represents someone who almost certainly was positive even just a few days prior. Knowing this is very important so their contacts can isolate.
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I have slightly better professors telling me what I will believe. Such is the state of science. Thanks for the chat.
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I mean, either that or you are wrong. Might be worth considering that you've misinterpreted given that an expert in the area has just told you that you are incorrect

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Re: "You're literally talking to an acknowledged world expert" It's easy to tell the non-experts who don't know what "PCR" is, never went to medical school, have no clue how diagnostics works in infectious disease (ex: the role of PCR, antibodies, etc. in diagnosis), or....
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