EXPLAINER: BA.2 variant takes over. What's known about it?
https://apnews.com/e46d8b2ef2a68a41c629d2c8a0f4537b
In the latest battle of the coronavirus mutants, an extra-contagious version of omicron has taken over the world.
The coronavirus version known as BA.2 is now dominant in at least 68 countries, including the United States.
