A person takes COVID-19 test at mobile testing site near Grand Central Terminal on Friday, Dec. 3, 2021, in New York. The omicron variant of COVID-19, which had been undetected in the U.S. before the middle of this week, had been discovered in at least five states by the end of Thursday, showing yet again how mutations of the virus can circumnavigate the globe with speed and ease.(AP Photo/Yuki Iwamura)
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