• I'm a school governor, and we've just had some guidance come through from the council: if someone has the 'classic symptoms' of Covid (high temp, continuous cough, lack of smell), they should self-isolate for 10 days (and household for 14 days), even if they get a negative test result. Their rationale seems to be that there is a 1 in 5 chance you're still positive even if the test comes back negative. I thought the false negative rate was much lower than that? Or is this one of those counter-intuitive Bayesian result things?

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