A newly reported case of back-to-back infections with the H3N2 flu strain and COVID-19 is fuelling fresh questions about how winter viruses interact – and whether one infection could be 'setting up' the next. At the same time, H3N2 is the dominant influenza A subtype in England this season, circulating at medium levels while COVID-19 remains at a low, baseline level but hasn't gone away.
Here's what the case actually showed, what we know about this fast-moving flu strain – and what it does mean for people trying to stay healthy through winter.
