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The CDC announced this week that the BA.2 Omicron variant, which is reportedly 30% more transmissible than the original BA.1 Omicron strain — has become dominant among new cases sequenced in the United States. That’s a startling rise for a variant that was less than 1% of all sequences as recently as January. But…

In recent weeks, there have been frequent reports about the rise of the more transmissible Omicron subvariant BA.2 around the world. BA.2 now makes up nearly all the new cases in Denmark, the U.K., Switzerland, Sweden, India, Belgium, Norway, South Africa, The Philippines, Hong Kong and many more regions. Throughout…