Travel restrictions cannot prevent the introduction of new COVID variants. Zhang Q, Ye Y, Zeng DD. J Travel Med 2023 May 17:taad066. doi: 10.1093.

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Zhang Q, Ye Y, Zeng DD. Travel restrictions cannot prevent the introduction of new COVID variants. J Travel Med 2023 May 17:taad066. doi: 10.1093.
PMID: 37195279