My partner's aunt was in her mid 70s and very fit, very active, still working and leading a full life. She was double vaccinated. She caught Covid and within 3 weeks, after some time in ICU, was dead. Can the same happen with flu? Or is this something very different? Just trying to get my head around it. It is such a shock. Also worried that it may have been grandchild who was the vector. How to live with that?