Why Variants Keep Covid-19 Cases Simmering in the U.S. – The Wall Street Journal

In recent weeks, a new version of the Covid-19 virusnamed BA.2.12.1became the dominant variety in the U.S., according to the Centers for Disease Control and Prevention. The variants rapid spread, coupled with growing case counts, raised concern among health officials, who last month strengthened their recommendations for Covid-19 boosters.

BA.2.12.1 is a version of the Omicron variant that was first detected in southern Africa last fall. Omicron quickly spread throughout the world, supplanting the once-dominant Delta and spawning a succession of increasingly infectious subvariants.

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Why Variants Keep Covid-19 Cases Simmering in the U.S. - The Wall Street Journal