Du, Zhanwei; Lin Wang; Bingyi Yang; Sheikh Taslim Ali; Tim K. Tsang; Songwei Shan; Peng Wu; Eric H. Y. Lau; Benjamin J. Cowling and Lauren Ancel Meyers

A fast-spreading SARS-CoV-2 variant identified in the United Kingdom in December 2020 has raised international alarm. We estimate that, in 16 out of 19 countries analyzed, there is at least a 50% chance the variant was imported by travelers from the United Kingdom by December 7th.