We’ve just survived the barrage of Black Friday emails only to jump straight into the chaos of the Christmas countdown – but alas! Something’s coming to rain on your winter parade, and it’s seasonal flu. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Yes, the Northern Hemisphere respiratory virus season is well underway, with flu cases across parts of Asia and Europe peaking much earlier than expected. But there are also a lot of other viruses around at this time of year: COVID-19 of course, RSV , and regular old colds as well. So how do you know when you’re coming down with flu?

The short answer is, you kind of don’t – at least not at first. There’s a lot of overlap between all these different respiratory infections, but there

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