Since the variant we now know as Omicron burst onto the scene late last year, it's proved to be a shapeshifter, spawning no fewer than five subvariants so far. Each have their own characteristics, but which is the most likely to become the dominant strain? There's finally enough data around to start making a comparison - so which subvariant will rule them all, what features give it the advantage, and what possible tools we might use to fight it? Also on today's show: * If I'm triple vaccinated and COVID is everywhere, could I have encountered it and fought it off, making me even more immune now? * What's the latest on the scary, mysterious hepatitis that's been reported in kids?