Re: expired Covid test kits and false positives

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5. A false positive is very unlikely, especially if you have symptoms.

Like you, I also tested positive recently using a test that expired last year. My son had already tested positive several days earlier, and I had started to develop symptoms too, so I was pretty sure the result was correct.

A false positive doesn't really make sense, scientifically. An expired test might be less sensitive, so it would be more likely to give you a false negative, but there's no reason it would detect virus particles that aren't there.