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.
A sign urges people to get tested for a COVID-19 variant in Blackburn, England. The U.K. is experiencing a surge in the delta variant, which was first identified in India.
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The World Health Organization says it will start assigning new names for variants of the coronavirus based on letters from the Greek alphabet — part of an effort to help avoid stigmatization around the virus.
Fabrice Coffrini/AFP via Getty Images