In recent weeks, a new version of the Covid-19 virus—named BA.2.12.1—became the dominant variety in the U.S., according to the Centers for Disease Control and Prevention. The variant’s 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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Source: Wall Street Journal