What do we know about “stealth omicron” so far? It’s an extra-contagious version of the omicron variant, but it doesn’t seem to cause more severe disease. Since it was first identified in November, BA.2 has been spreading around the globe, driving new surges in parts of Asia and Europe. It’s now the dominant coronavirus version in the U.S. and more than five dozen other countries. Read more: https://bit.ly/3jvUpk9