We're a family of 5 and only one of us has ever tested positive for covid. We're obviously all bound to get it at some point but it occurred to me that once testing ceases we'll never be able to say confidently that we've had it (unless we're so ill with it that it's confirmed of course, but I hope that's unlikely). It's a bit like the people who were I'll before testing came a thing who thought they'd had it but weren't able to know for sure.