I’ve been getting questions about long covid and my standard answer has been that I don’t think it’s any different from post-viral syndrome, a condition that affects some people after a viral infection but that usually clears up within a few months. I’ve been generally sceptical of claims of long covid as some distinct entity for a couple of reasons.
One of the most frequent questions I’ve been getting recently is how accurate I think the covid tests are, and in particular the PCR tests. As it happens, a systematic review has recently been published in Evidence Based Medicine that looks at the covid tests (both PCR and antibody), so I thought it would be interesting to look in to the evidence together. This article gets a bit technical and math-heavy in places, so please bear with me. I think the payoff is worth it.