International risk of SARS-CoV-2 Omicron variant importations originating in South Africa

  1. Yuan Bai
  2. Zhanwei Du
  3. Mingda Xu
  4. Lin Wang
  5. Peng Wu
  6. Eric H. Y. Lau
  7. Benjamin J. Cowling
  8. Lauren Ancel Meyers
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Abstract

Omicron, a fast-spreading SARS-CoV-2 variant of concern reported to the World Health Organization on November 24, 2021, has raised international alarm. We estimated there is at least 50% chance that Omicron had been introduced by travelers from South Africa into all of the 30 countries studied by November 27, 2021.

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