The brothers and sisters of Omicron

Looking at the family tree of coronavirus is a bit like taking a trip down memory lane.The whole crew is there including the famous ones like Alpha, Beta and Delta, and the ones that never really made it into the big time.But what if we zoom in on Omicron? Lately, there's been a bit of noise made about a few Omicron sub variants. What are they? And how much should we worry?Also on today's show:* TGA releases a post-market review for rapid antigen tests. What can we learn from it?References:https://www.tga.gov.au/post-market-review-antigen-and-rapid-antigen-tests