(Image: Michael Kirkham)

I WAKE up feeling lousy. The app on my phone tells me I had a fitful night’s sleep, which might have something to do with it. But I feel worse than just tired, so I go to the bathroom and pee on a sensor strip. Most metabolites are fine but there’s an excess of nitrates, which could indicate a urinary tract infection.

Back in my bedroom I run more tests. My blood results tell me my vitamin D levels could be higher – but I live in dreary London, so I knew that already. My heart rate and blood oxygen are fine, though my inflammation levels are higher than normal. Then I swab my nose and the machine by my bedside takes just a few minutes to tell me what’s really wrong: I’ve got the flu. A quick look at the flu map on my …

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