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Shear, M. D., Stolberg, S. G., Yoon, J., Khan, A. J., & Minder, R. (2021, December 13). Covid News: U.S. to Tighten Testing for Travelers amid Omicron Worries. The New York Times.
https://www.nytimes.com/live/2021/11/30/world/omicron-variant-covid

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