How can someone get both negative and positive PCR result 3 hours apart?

Post date: 2021-09-25 01:11:26
Views: 21
My friend, UK-based, took a COVID-19 PCR test yesterday. At 6:30 this morning she got an email to say the test came back negative. At 9:30 she got another email to say the test came back positive. What might be going on?

She's tried calling Track and Trace (119) but they were confused and went away to investigate. They said they'd call her back but haven't done so yet. What I'd really like to know is what might be going on behind the scenes for her to receive an initial negative result and a subsequent positive result. She has only taken the one test recently.
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