Catching, and avoiding catching COVID, seems to be a bit of a lottery. I'm at the theatre, cinema or galleries at least once a week, plus various group activities that take place in meeting rooms with maybe 50 or 100 other people, plus restaurants and cafes. I've never had COVID. 10 days ago, I was sat in a car with a friend for over 2 hours, spent the rest of the day together and then drove back for 2 hours. 24 hours later, she tested positive for COVID and has been poorly ever since; I've tested negative. We've both been tripled jabbed. Having anti bodies seems to be a better indicator than having no pals!