Scientists do not yet know how dangerous the new Omicron variant is, but its many mutations set off alarms, lowering hopes of putting the pandemic in the past.
Hours after South African scientists announced the existence of a troublesome new variant, Britain banned travelers from southern Africa. The United States and other nations quickly followed suit.
At least 43 people have been killed in clashes in the area, the U.N. says, while the nation’s leaders are focused elsewhere, dealing with the fallout from a coup.
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