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People line up to get on an Air France flight to Paris at OR Tambo's airport in Johannesburg, South Africa, on Friday as several countries announced travel bans in response to the omicron variant of the coronavirus.
Jerome Delay
The World Health Organization deemed it a variant of concern, and the U.S. is banning travel from parts of Africa where it's spreading. Here's what scientists know and what they're trying to learn.
NPR News